JSUNIL TUTORIAL CBSE MATHS & SCIENCE
  • HOME
    • STUDY ZONE
    • Study Material
    • Think Zone
    • Board Papers Solutions
    • CBSE Board Date Sheet
    • Syllabus for Class I to XII
  • CLASS 10
    • 10th Science Term-I
      • X Chemical Reaction and Equation
      • X Acid Base and Salt
      • X Metals and Non Metals
      • X Electricity
      • X Magnetic Effects of Currents
      • X Source Of Energy
      • X Biology Term-1
        • 10th Life Process
        • 10th Control and coordination
    • 10th science Term II
      • Carbon and Its Compounds
      • Periodic Classification of Elements
      • Light - Reflection and Refraction
      • The Human Eye and the Colourful World
      • X Biology Term-II
        • How Do Organisms Reproduce ?
        • Heredity and Evolution
        • Our Environment
        • Management of Natural Resource
    • 10th Maths Term I
      • X Real Numbers
      • X Polynomials
      • X Linear Equations in Two Variables
      • X Similar Triangles
      • X Trigonometry and Identities
      • X Statics(Mean,median and Mode)
    • 10th Maths Term II
      • 10th Quadratic Equations
      • 10th Arithmetic Progressions
      • 10th Co-Ordinate Geometry
      • 10th Height and Distance
      • 10th Circles
      • 10th Area Related to Circles
      • 10th Surface Areas and Volumes
      • 10th Probability
      • 10th Constructions
    • 10th Social Science
      • 10th History and Geography
      • 10th Civics and Economics
    • 10th CBSE English
    • 10th Solved Assignments
  • CLASS 9
    • 9th Science term I
      • IX Motion and Rest
      • IX Force and Laws of motions
      • IX Gravitation
      • IX Matter in our surrounding
      • IX Is Matter around Us Pure
      • IX Biology Term-1
        • Cell structure n function class9
        • Tissue class9
        • Improvement in food resources class9
    • 9th Science term II
      • Atoms and Molecules
      • Structure of the Atom
      • Thrust and Pressure
      • Work and Energy
      • Sound
      • IX Biology Term-2
        • Diversity in Living Organisms
        • Natural Resources
        • Why Do We Fall ill ?
    • 9th Maths term I
      • IX Number system
      • IX Polynomials
      • IX Introduction to Euclid Geometry
      • IX Lines and Angles
      • IX Triangles
      • IX Coordinate geometry
      • IX Area of triangles by Heron's formula
    • 9th Maths term II
      • Linear equations in two variables
      • Quadrilaterals
      • Area of Parallelogram and Triangle
      • Circle
      • Surface Areas and Volumes
      • Constructions
      • Statistics
      • Probability
    • IX Social Science
      • 9th Social Science Term-1
      • 9th Social Science Term-2
    • IX English and Hindi
    • CBSE ASL Corner
  • IX Sample Papers
    • 9th Mid Term Papers
    • 9th Final Exam papers
    • 9th Sample Paper 2018
    • IX Sample Papers SA-I
      • 9 Mathematics SA1
      • 9 Science SA1
      • 9 Social Science SA1
      • 9 English and Hindi SA1
    • IX Sample Paper SA-II
      • Mathematics
      • Science
      • Social Science
      • English Hindi Sanskrit
    • IX Practical skill Science
  • X Sample Papers
    • 10th Board Exam Papers
      • 10th Mid Term Papers
      • 10th Sample Paper 2018-19
    • X Sample Paper SA-I
      • X Mathematics SA1
      • X Science SA1
      • X Social Science SA1
      • 10th English sa-1 paper
      • 10th Hindiand sanskrit sa-1 paper
    • X Sample Paper SA-II
      • Mathematics
      • Science
      • Science Practicals MCQ
      • Social Science
      • Hindi English and Sanskrit
  • CLASS 8
    • 8th Science
      • Class 8 Physics
        • Force Pressure and Frictions
        • Sound
        • Chemical Effects of Electric Current
        • Refraction of Light and Our Eyes
        • Some Natural Phenomenon
        • Stars and the Solar System
      • Class 8 Chemistry
        • Synthetic fibre and Plastics
        • Metals and Non-Metals
        • Combustion ,Flame and Fuel
        • Coal Petroleum, Natural Gases
        • Air and Water Pollution
      • Class 8 Biology
        • Crop Production and Management
        • Microorganisms friend and foe
        • Cell structure and functions
        • Reproduction in animals
        • Reaching the Age of Adolescence
        • Conservation of plants and animals
    • Class 8 Mathematics
      • Algebra
        • Rational Number
        • Square and Square Roots
        • Algebraic Expression
        • Factorization
        • Exponent and Power
        • Linear Equations
      • Commercial math
        • Unitary Methods
        • Percentage
        • Profit and Loss
        • Discounts & Sales Tax
        • Compound Interest
      • Geometry/Mensuration
        • Quadrilateral
        • Practical Geometry
        • Perimeter and Area
        • Data Handling
        • Introduction of Graphs
    • Class 8 Sample papers
      • 8th Question paper sa1
      • 8th Question paper sa2
  • CLASS 07
    • class 7 Science
      • class 7 Physics
      • class 7 chemistry
      • class 7 Biology
      • 7th Science Test Papers
      • 7th Science Solved Papers
    • class 7th Maths
      • Class 07 Maths Tem-I
      • Class 07 Maths Tem-II
    • Class7 Exam Papers
  • Class 06
    • 6th Maths
    • 6th science
      • 6th Science Term-1
      • 6th Science Term-2
  • NCERT Solutions
    • X Science and Maths
    • IX Science and Maths
  • Class 11 - 12
    • 12th Sample paper
    • 11th Study Material
      • 11th Physics
      • 11th Chemistry
      • 11th Maths
    • 12th Study Material
  • NTSE
    • NTSE SAMPLE PAPER
  • HOME
    • STUDY ZONE
    • Study Material
    • Think Zone
    • Board Papers Solutions
    • CBSE Board Date Sheet
    • Syllabus for Class I to XII
  • CLASS 10
    • 10th Science Term-I
      • X Chemical Reaction and Equation
      • X Acid Base and Salt
      • X Metals and Non Metals
      • X Electricity
      • X Magnetic Effects of Currents
      • X Source Of Energy
      • X Biology Term-1
        • 10th Life Process
        • 10th Control and coordination
    • 10th science Term II
      • Carbon and Its Compounds
      • Periodic Classification of Elements
      • Light - Reflection and Refraction
      • The Human Eye and the Colourful World
      • X Biology Term-II
        • How Do Organisms Reproduce ?
        • Heredity and Evolution
        • Our Environment
        • Management of Natural Resource
    • 10th Maths Term I
      • X Real Numbers
      • X Polynomials
      • X Linear Equations in Two Variables
      • X Similar Triangles
      • X Trigonometry and Identities
      • X Statics(Mean,median and Mode)
    • 10th Maths Term II
      • 10th Quadratic Equations
      • 10th Arithmetic Progressions
      • 10th Co-Ordinate Geometry
      • 10th Height and Distance
      • 10th Circles
      • 10th Area Related to Circles
      • 10th Surface Areas and Volumes
      • 10th Probability
      • 10th Constructions
    • 10th Social Science
      • 10th History and Geography
      • 10th Civics and Economics
    • 10th CBSE English
    • 10th Solved Assignments
  • CLASS 9
    • 9th Science term I
      • IX Motion and Rest
      • IX Force and Laws of motions
      • IX Gravitation
      • IX Matter in our surrounding
      • IX Is Matter around Us Pure
      • IX Biology Term-1
        • Cell structure n function class9
        • Tissue class9
        • Improvement in food resources class9
    • 9th Science term II
      • Atoms and Molecules
      • Structure of the Atom
      • Thrust and Pressure
      • Work and Energy
      • Sound
      • IX Biology Term-2
        • Diversity in Living Organisms
        • Natural Resources
        • Why Do We Fall ill ?
    • 9th Maths term I
      • IX Number system
      • IX Polynomials
      • IX Introduction to Euclid Geometry
      • IX Lines and Angles
      • IX Triangles
      • IX Coordinate geometry
      • IX Area of triangles by Heron's formula
    • 9th Maths term II
      • Linear equations in two variables
      • Quadrilaterals
      • Area of Parallelogram and Triangle
      • Circle
      • Surface Areas and Volumes
      • Constructions
      • Statistics
      • Probability
    • IX Social Science
      • 9th Social Science Term-1
      • 9th Social Science Term-2
    • IX English and Hindi
    • CBSE ASL Corner
  • IX Sample Papers
    • 9th Mid Term Papers
    • 9th Final Exam papers
    • 9th Sample Paper 2018
    • IX Sample Papers SA-I
      • 9 Mathematics SA1
      • 9 Science SA1
      • 9 Social Science SA1
      • 9 English and Hindi SA1
    • IX Sample Paper SA-II
      • Mathematics
      • Science
      • Social Science
      • English Hindi Sanskrit
    • IX Practical skill Science
  • X Sample Papers
    • 10th Board Exam Papers
      • 10th Mid Term Papers
      • 10th Sample Paper 2018-19
    • X Sample Paper SA-I
      • X Mathematics SA1
      • X Science SA1
      • X Social Science SA1
      • 10th English sa-1 paper
      • 10th Hindiand sanskrit sa-1 paper
    • X Sample Paper SA-II
      • Mathematics
      • Science
      • Science Practicals MCQ
      • Social Science
      • Hindi English and Sanskrit
  • CLASS 8
    • 8th Science
      • Class 8 Physics
        • Force Pressure and Frictions
        • Sound
        • Chemical Effects of Electric Current
        • Refraction of Light and Our Eyes
        • Some Natural Phenomenon
        • Stars and the Solar System
      • Class 8 Chemistry
        • Synthetic fibre and Plastics
        • Metals and Non-Metals
        • Combustion ,Flame and Fuel
        • Coal Petroleum, Natural Gases
        • Air and Water Pollution
      • Class 8 Biology
        • Crop Production and Management
        • Microorganisms friend and foe
        • Cell structure and functions
        • Reproduction in animals
        • Reaching the Age of Adolescence
        • Conservation of plants and animals
    • Class 8 Mathematics
      • Algebra
        • Rational Number
        • Square and Square Roots
        • Algebraic Expression
        • Factorization
        • Exponent and Power
        • Linear Equations
      • Commercial math
        • Unitary Methods
        • Percentage
        • Profit and Loss
        • Discounts & Sales Tax
        • Compound Interest
      • Geometry/Mensuration
        • Quadrilateral
        • Practical Geometry
        • Perimeter and Area
        • Data Handling
        • Introduction of Graphs
    • Class 8 Sample papers
      • 8th Question paper sa1
      • 8th Question paper sa2
  • CLASS 07
    • class 7 Science
      • class 7 Physics
      • class 7 chemistry
      • class 7 Biology
      • 7th Science Test Papers
      • 7th Science Solved Papers
    • class 7th Maths
      • Class 07 Maths Tem-I
      • Class 07 Maths Tem-II
    • Class7 Exam Papers
  • Class 06
    • 6th Maths
    • 6th science
      • 6th Science Term-1
      • 6th Science Term-2
  • NCERT Solutions
    • X Science and Maths
    • IX Science and Maths
  • Class 11 - 12
    • 12th Sample paper
    • 11th Study Material
      • 11th Physics
      • 11th Chemistry
      • 11th Maths
    • 12th Study Material
  • NTSE
    • NTSE SAMPLE PAPER
Search

Force and Pressure Class 8 Living Science Solution 

12/4/2016

44 Comments

 
Picture
Solution  of Chapter Force and Pressure Class 8 Living Science 
A. Multiple choices

1. (a) Gravitational force 
2.(a) friction    
3.(d)at  the same depth, pressure is the same in all directions.

4.(c) Pascal      
5. (b) A ­ B acting in the direction of A    
6. (d) Mass      
7. (a) Gravitational force

8. (d) The pressure doubles. Pressure (P) = Force (F)/Area (A) = 10 N / 0.1 m2 = 100 N/m2 = 100 Pa
Now, according to the question,
New area, A' = A/2 and F' = F ∴ P' = F'/A' = 2F/A = 2P = 2 × 100 = 200 Pa
Thus, the pressure gets doubled.


B. V. Short types:

1. True. [Push or pull acting on a body are called force. The direction in which an object is pushed or pulled is called the direction of the force.]

2. False. [When we apply the brakes to slow down a bicycle it will bicycle will move forward. Thus, the bicycle will move in the opposite direction of the applied force.]


3. The net force acting on the object is A + B. [If two forces act on a body in the same direction, then the net force acting on object will be sum of the two forces.]


4. The net force acting on the object is A ­ B.[If two forces are applied on an object in opposite directions, then the net force acting on the object is the difference between the two forces. ]


5. No. The net force of all forces determines the acceleration of the body


6. False. [Every object in the universe exerts gravitational force on other matter.]


7. Weight [An object’s weight is a measure of the Earth's gravitational pull acting on it. Weight   = mg]


8. Magnetic force          9.  Electrostatic force          10. Friction force  


11. The larger the area over which a force acts, the lesser the pressure is.


12. Pressure exerted by a liquid increases with depth and acts in all directions.


13. True. [Due to the atmospheric pressure of air, we experience a force equal to that exerted by a mass of 1 kg on every square centimetre of our body.]


14. False. Atmospheric pressure is caused by the weight of air molecules above the atmosphere. As we go to higher altitudes, the air becomes thinner and the atmospheric pressure decreases


C. Short type (i)


1. Force can be described by two things: its magnitude and the direction in which it acts. Force is a vector quantity.             

2. If several forces act on a body in different directions, the effect on the body will be due to the magnitude and direction of the net force acting on it. So, the body will move in the direction of the resultant force


3. Gravitational force is the force with which the Earth pulls everything towards itself. So, if an object is thrown up, it slows down and then comes down because of the gravitational force of the Earth.


4. 
Mass
The mass of a body is the quantity of matter contained in it
It is a scalar quantity that has only magnitude, no direction
The SI unit of mass is the kilogram (kg).


Weight
The weight of a body is the force with which it is attracted towards the centre of the Earth
Weight is a vector quantity having magnitude as well as direction
The SI unit of weight is the Newton (N).

5. Every magnetic substance is surrounded by its own invisible magnetic field, depending on its pole strength. A magnet can act from a distance because of the field of magnetic force.

6. Pressure is the trust acting on a unit area of an object. Pressure =  Thrust/Area

Pressure depends on two factors: (i) Force applied (ii) Area over which the force acts

7. Atmospheric pressure is the force per unit area exerted on the surface of the Earth by the atmosphere. Atmospheric pressure is caused by the weight of air molecules in the atmosphere.

8. It is difficult to cut vegetables with a blunt knife because it has more area compared to a sharp knife, therefore the pressure exerted by the blunt knife is less than that of the sharp knife.

D. Short type (ii)


1. Force: Force is an agent that change or try to change the state of an object. The SI unit of force is kg m/s² or Newton (N).

Effects of force: 1. Change the state of rest and motion. 2. It can change the speed of a moving object. 3. It can change the direction of a moving object. 4. It can change the shape or size of an object.

2. Contact Force:  The force which acts by touching objects is called Contact Force. For example muscular force, friction force

Non­ Contact Force: The force which act without touching objects is called non contact Force .. For example: Gravitational force, Electrostatic force

3. Friction is a kind force that always opposes motion of body. For example, when you stop pedalling a bicycle, it slows down and stops after some time because of the frictional force.


4. Caterpillar tracks are used in battle tanks instead because it distributes force over larger area and  reduce the pressure over surface. This prevents tracks from sinking in areas where wheeled vehicles of the same weight can easily sink.


5 The pressure exerted by the liquid is given by the following expression:

P = ρgh
Here, ρ = Density of the liquid g = Acceleration due to gravity h = Height/depth of the liquid column

Here, pressure is directly proportional to the height of the liquid column. If we go down into the liquid, the depth (h) of the liquid column increases. Thus, the pressure in the liquid increases with increasing depth.

6. When we press a rubber sucker on a smooth surface, we remove some of the air between the sucker and the smooth surface. This deficiency of air lets the air outside to exert pressure on the surface of the sucker. Force due to the pressure keeps the sucker stuck to the surface.


HOTs:
1. False. If no external force is applied on the body, then there must be two equal and opposite forces acting on the body. Both these forces add up to zero.

2. False. Contact force is the force in which a direct contact is required between two bodies. The contact may also be with the help of a stick or a piece of rope. If we use a stick to push an object, we make the contact with the help of stick. This push or force is caused by the action of the muscles in our body. This muscular force is a contact force.

3. The magnitude of gravitational force depends on the masses of two objects and the distance between them.

Gravitational force generally felt between objects of greater masses. Since mass of building and our body smaller as compared to the earth, we are not pulled towards the building.

4. It is necessary to define pressure as a separate quantity to find the impact of force on a surface.

As we know that the impact of force depends on both the amount of force applied and the area over which it is applied. So, only force is not enough for this purpose.

5. If one of the windows in a jet plane breaks due to an accident, the air pressure inside   plane decreases. At such low pressure, we can have problems like nose bleeding, because the pressure exerted by the blood in our body will be much higher than the pressure outside. This can cause blood vessels to burst.


​6. If we press a rubber sucker on a rough surface, it will not stick to the surface because an airtight seal cannot be achieved between the surfaces. It is so because air rushes into the space between the rubber sucker and the rough surface.
44 Comments

Crop Production _Living Science Class 8 Solution

12/4/2016

36 Comments

 
Picture
FOR FORMATIVE AND SUMMATIVE ASSESSMENT
A. MULTIPLE-CHOICE QUESTIONS: Choose the most appropriate answer.
Which of these is not a cereal?
a. maize            b. gram c. wheat  d. rice
Which of these is not a kharif crop?
a. wheat            b. rice   c. maize d. groundnut
Which of these nutrients is compost rich in?
a. organic nutrients b. nitrogen c. phosphorus d. potassium
Which of these is not a fungal disease of plants?
a. wilt    b. rust   c. smut d. blight (of potatoes)
Which one of the following is not true about ploughing?
a. It loosens the soil.     b. It aerates the soil. c. It prevents soil erosion. d. It allows easy penetration of roots into the soil.
Compost lacks which of the following nutrients?
a. nitrogen        b. phosphorous  c. potassium   d. all of these
7. Which one of the following does not add nutrients to the soil?
a. crop rotation b. field fallow    c. manures d. ploughing
8. Which of the following machines can be used to harvest a crop and also to beat out the grain from the chaff?  a. harvester            b. combine       c. thresher         d. harrow
B. VERY SHORT-ANSWER QUESTIONS: Give one-word answers.
  1. About how many years ago did agriculture begin?
  2. Large grasses cultivated for their nutritious seeds are called -----------
  3. Preparation of the soil involves ----- and ------ it.
  4. The agricultural implement used to sow seeds is called a seed --------      
  5. Mowing a field to remain free of crops for ---- one or more seasons is called field .It allows the field to regain ---------.
  6. All crops require approximately the same amount of water at roughly the same time periods of their growth. True or false?
  7. Name one pesticide you will use to kill insects that harm crops.
  8. Pesticides are used to kill small pests, but they are not strong enough to cause harm to humans. True or false?
  9. Name the nitrogen fixing bacteria in root nodules of leguminous plants.
  10. Conversion of proteins into ammonia is called   
  11. Some bacteria can convert nitrate salts in the soil to free nitrogen. True or false?
  12. A mulch animal is one that yields   -------------------
  13. Rearing honeybees for honey is called  ----------
C. SHORT-ANSWER QUESTIONS (TYPE I): Answer in a sentence or two.
1. Name three natural methods of adding nutrients to soil.
2. What are weeds?
3. Why should grains be dried before storage?
4. Why does the government usually maintain a buffer stock of grains?
5. What is hybridization?
6. List the steps involved in the nitrogen cycle.
7. What do you mean by nitrogen fixation? S. What is nitrogen assimilation?
9. What enables leguminous plants to fix nitrogen?
10. What is animal husbandry?
D. SHORT-ANSWER QUESTIONS (TYPE II): Answer in about 30 words.
1. Distinguish between kharif and rabi crops, giving two examples of each.
 2. List the steps involved in crop production, in sequential order.
3. Why is it important to plant seeds at the correct distances from each other?
4. Why do farmers normally use a mixture of manures and fertilizers in their fields?
 5. What method of irrigation will you use if you live in a dry area with shortage of water? Explain the method.
6. What is water logging? How does it harm the crops? How can it be prevented?
7. Discuss two methods of weeding in which poisonous chemicals are not used.
8. Differentiate between insecticides, rodenticides and fungicides. Which of these are pesticides?
9. Discuss with an example how hybridization is used for developing new varieties of crops with desired characteristics.
10. Differentiate between nitrification and denitrification.
LONG ANSWER QUESTIONS: Answer in about 60 words.
1. What are the advantages of ploughing the soil before sowing seeds?
2. What precautions must be kept in mind while sowing seeds in a field?
3. Discuss two natural methods of manuring.
4. Draw a labelled diagram to illustrate the nitrogen cycle.
HOTS QUESTIONS: Think and answer.
1. Which method, according to you, can bring about the maximum increase in crop produce in our country in future?
a. increasing land under cultivation                     c. less wastage in storage
b. using more manures and fertilizers                 d. using better varieties of crop plants
 2. What do you think are the drawbacks of seeds being unevenly distributed in a field while sowing?
3. Do you expect to find fully-grown crop plants in a nursery? Why? Why not?
4. Crop rotation is practised by farmers so that they have different products to sell in the market in every season. Do you agree? Give reasons.
5. I have grown a few wheat plants in my garden because I like the plants. Am I growing a wheat crop? Give reasons.  
6. It is observed that melon fruits growing in the fields sometimes crack, exposing the contents inside. What do you think can be the reason? (HINT: This generally happens in fields where drainage is not proper.)


Solution 
8th Crop Production _Living Science Solution
A. Multiple choice questions:
1. (a) Gram  2.(a) wheat 3.(a) organic nutrients  4.(a) wilt  5. (c) it prevent soil erosion              6. (d) All of these                                     7. (d) Ploughing         8. (b) Combine.
B. Very short type Questions

1. Ten thousands yrs ago               
2.Cereals                
3.Loosing and turning   
4.drill   
5.Fielf fallow, nutrients  

6. False. All crops require different amounts of water. For example, a paddy field needs more water compared to a wheat field. 
7. BHC or Malathion             
8.False Cause irritation of skin and respiratory problems, So fruits and vegetable washed before use. 
9. Rhizobium 10.Ammonification  
11.True they are called denitrifying bacteria
12.Milk
13.Apiculture


C. Short type Questions - I

1. The three natural methods of adding nutrients to soil are: Field fallow, Crop rotation and Mixed cropping
2. The unwanted plants that grow along with the crops and share nutrients are called weeds. Weeds decrease the crop yield as they compete with crops for water, nutrients and sunlight and limit their growth.
3. Grains should be dried before storage to remove moisture. This excess moisture helps growth of microbes that may destroy the grains.
4. The government usually maintains a buffer stock of grains to avoid shortage of grains during natural disaster.
5. Hybridisation is a technique to develop new varieties of crops by cross­breeding two different  varieties.
6. The steps involved in the nitrogen cycle are as follows:
Nitrogen fixation ®  Nitrogen assimilation ® Ammonification ®  Nitrification ® Denitrification
7. Nitrogen fixation is the process of converting free atmospheric nitrogen gas into nitrogen compounds  nitrites and nitrates .
8. Nitrogen assimilation is the process by which inorganic nitrogen compounds are converted into organic compounds such as proteins that become a part of living beings.
9. The nitrogen fixing bacterium Rhizobium ive in the root nodules of leguminous plants enables them to fix nitrogen.
10. Animal husbandry is defined as the rearing of domestic animals to obtain food and other products from them.

D. Short type Questions- II
1.
Kharif crops
Rabi crops 
They are sown  during June or July
They are sown  from October to December
 
They are harvested in September or October
They are harvested in March or April
 
Examples: rice, maize
Examples: wheat, pea

2. The steps involved in crop production are as follows: Preparation of soil, selection of seed and sowing Manuring, irrigation and weeding, Protection from pests and diseases, Harvesting, threshing and winnowing and Storage
3. Seeds should be planted at a proper distance from each other so that they cannot compete for water, nutrients and sunlight.
4. Farmers normally use a mixture of manure and fertilizers in their fields to increase the yield and production of crops. Manure is good for plants as it provides them with organic nutrients but it lacks some important nutrients like nitrogen, phosphorous and potassium. So, along with manure, farmers also use fertilizers such as NPK fertilizers that provide nitrogen, phosphorous and potassium.
5. Drip irrigation is the method of irrigation useful for dry areas which have a shortage of water. In this method, water is. Water is allowed to fall drop by drop from a pipe placed near the roots of plant.
6. When an excess of water is supplied to the field it is called  water logging. As a result of this, the air supply to the roots reduces and in extreme cases, gets totally cut off. This results in the retarded growth of plants. Water logging can be prevented by supplying just the adequate amount of water to the field using a proper drainage system.
7. The two methods of weeding in which chemicals are not used are:
Manual method: Weeds are pulled out by hand or uprooted using a trowel or a harrow.
Introducing Insect: Insects that feed upon only specific weeds are used control weeds.
8. Insecticides are chemicals used to kill insects like locusts. Rodenticides are chemicals used to kill rodents like rats and Fungicides are chemicals used to destroy fungi.
 Insects, rodents and fungi are pests. So insecticides, rodenticides and fungicides are all pesticides.
9. Hybridization method of obtaining  new variety of desirable traits by cross­breeding two different varieties of crops for example  if two varieties of crops, one with high yield and other with disease resistance, can be crossbred to obtain a variety that has both the traits, i.e., high yield and disease resistance.
10. Nitrification is the process of conversion of ammonia into nitrates .It is carried out by nitrifying bacteria.
Denitrification is the process of conversion of nitrates into free nitrogen gas. It is carried out by denitrifying bacteria.
HOTS Question:
1. (d) using better varieties of crop plants. Better varieties of crop plants will result in increased production as they  give higher yield as well as high resistance to diseases.
2. The drawbacks of uneven distribution of seeds in a field, while sowing, are:
 (i) They will compete for water, nutrients and sunlight that result limited growth. (ii) If they are sown far apart, it will result in the wastage of field area. (iii) If seeds are not sown at the proper depth and covered by soil, they may be eaten up by birds.
3. We won't find fully­ grown crop plants in a nursery  like rice, tomato, onion, etc because they are transferred to the fields from nurseries in their seedling stage.
4. No, farmers adopt crop rotation to maintain the fertility of the soil. For examples , wheat and rice use large amount of nitrogen from soil therefore  legumes plants are  grown next to the wheat or rice to replenish nitrogen naturally in field.
5. No. Growing a few plants in a garden is not crop production. Crop production is the practice of growing wheat on a large scale in a field to cultivate grains
6. Melons growing in waterlogged fields with poor drainage tend to absorb more water than they require. Melons cannot hold this excess water, therefore, they crack.
36 Comments

Maths and Science 2016-17 Syllabus for class 9 and 10

2/4/2016

5 Comments

 
CBSE Syllabus for class 9 and 10 session 206-17
Note: No Change in Examination pattern
Picture
Picture
Download Syllabus - CBSE Secondary School Examination
Secondary School Curriculum 2016-17: Main Subjects
 Secondary School Curriculum 2016-17: Languages
5 Comments

    Stay Updated. Enter E-Mail:

    Delivered by FeedBurner

    Blog Posts Categories

    All
    10th Biology
    10th English Term 1
    10th English Term 2
    10th Maths Term 01
    10th Maths Term 02
    10th Question Paper Sa1
    10th Sample Paper 2019
    10th Sample Paper 2020
    10th Sample Paper SA2
    10th Science Study Term 02
    10th Science Term 01
    10th Social Science Sa1
    10th Social Science Term 2
    12th Sample Paper
    6th Maths And Science
    6th Science
    7th Maths
    7th Maths And Science
    7th Sample Paper
    7th Science
    8th Mathematics
    8th Question Papers
    8th Science
    9th Mathematics Term 01
    9th Mathematics Term 02
    9th Midterm Exam Papers
    9th PSA Study Material
    9th Sample Paper Exam 2018
    9th Sample Paper Exam 2020
    9th Sample Paper SA2
    9th Sample Paper SA I
    9th Science Term 01
    9th Science Term 02
    9th Social Science SA 1
    9th Social Science SA 2
    Board Paper Solutions
    CBSE 10 [Old Post]
    CBSE 11th And 12th
    CBSE News Updates
    Class 12 Study Materials
    CPS And SDV Updates
    NCERT Solutions
    Olympiad-NTSE
    Online Class 08
    Online Class 09
    Online Class 10
    Science-maths Practicals
    Study Material

          Join Us For Update

                Author

    I am a school teacher and serving CBSE students community since 1995.

    Archives

    January 2021
    May 2020
    February 2020
    September 2019
    July 2019
    March 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018
    June 2018
    April 2018
    March 2018
    February 2018
    January 2018
    December 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    May 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    September 2016
    August 2016
    July 2016
    June 2016
    May 2016
    April 2016
    March 2016
    February 2016
    January 2016
    December 2015
    November 2015
    October 2015
    September 2015
    August 2015
    July 2015
    June 2015
    May 2015
    April 2015
    March 2015
    February 2015
    January 2015
    December 2014
    November 2014
    October 2014
    September 2014
    August 2014
    July 2014
    June 2014
    May 2014
    April 2014
    March 2014
    February 2014
    January 2014
    December 2013
    November 2013
    October 2013
    September 2013
    August 2013
    July 2013
    June 2013
    May 2013
    April 2013
    March 2013
    February 2013
    January 2013
    December 2012
    November 2012
    October 2012
    September 2012
    August 2012
    July 2012
    June 2012
    May 2012
    April 2012
    March 2012
    February 2012
    January 2012
    December 2011
    November 2011
    October 2011
    September 2011
    August 2011
    July 2011

      Comment & Submit Papers

      [object Object]
      Max file size: 20MB
    Submit
Powered by Create your own unique website with customizable templates.
  • HOME
    • STUDY ZONE
    • Study Material
    • Think Zone
    • Board Papers Solutions
    • CBSE Board Date Sheet
    • Syllabus for Class I to XII
  • CLASS 10
    • 10th Science Term-I
      • X Chemical Reaction and Equation
      • X Acid Base and Salt
      • X Metals and Non Metals
      • X Electricity
      • X Magnetic Effects of Currents
      • X Source Of Energy
      • X Biology Term-1
        • 10th Life Process
        • 10th Control and coordination
    • 10th science Term II
      • Carbon and Its Compounds
      • Periodic Classification of Elements
      • Light - Reflection and Refraction
      • The Human Eye and the Colourful World
      • X Biology Term-II
        • How Do Organisms Reproduce ?
        • Heredity and Evolution
        • Our Environment
        • Management of Natural Resource
    • 10th Maths Term I
      • X Real Numbers
      • X Polynomials
      • X Linear Equations in Two Variables
      • X Similar Triangles
      • X Trigonometry and Identities
      • X Statics(Mean,median and Mode)
    • 10th Maths Term II
      • 10th Quadratic Equations
      • 10th Arithmetic Progressions
      • 10th Co-Ordinate Geometry
      • 10th Height and Distance
      • 10th Circles
      • 10th Area Related to Circles
      • 10th Surface Areas and Volumes
      • 10th Probability
      • 10th Constructions
    • 10th Social Science
      • 10th History and Geography
      • 10th Civics and Economics
    • 10th CBSE English
    • 10th Solved Assignments
  • CLASS 9
    • 9th Science term I
      • IX Motion and Rest
      • IX Force and Laws of motions
      • IX Gravitation
      • IX Matter in our surrounding
      • IX Is Matter around Us Pure
      • IX Biology Term-1
        • Cell structure n function class9
        • Tissue class9
        • Improvement in food resources class9
    • 9th Science term II
      • Atoms and Molecules
      • Structure of the Atom
      • Thrust and Pressure
      • Work and Energy
      • Sound
      • IX Biology Term-2
        • Diversity in Living Organisms
        • Natural Resources
        • Why Do We Fall ill ?
    • 9th Maths term I
      • IX Number system
      • IX Polynomials
      • IX Introduction to Euclid Geometry
      • IX Lines and Angles
      • IX Triangles
      • IX Coordinate geometry
      • IX Area of triangles by Heron's formula
    • 9th Maths term II
      • Linear equations in two variables
      • Quadrilaterals
      • Area of Parallelogram and Triangle
      • Circle
      • Surface Areas and Volumes
      • Constructions
      • Statistics
      • Probability
    • IX Social Science
      • 9th Social Science Term-1
      • 9th Social Science Term-2
    • IX English and Hindi
    • CBSE ASL Corner
  • IX Sample Papers
    • 9th Mid Term Papers
    • 9th Final Exam papers
    • 9th Sample Paper 2018
    • IX Sample Papers SA-I
      • 9 Mathematics SA1
      • 9 Science SA1
      • 9 Social Science SA1
      • 9 English and Hindi SA1
    • IX Sample Paper SA-II
      • Mathematics
      • Science
      • Social Science
      • English Hindi Sanskrit
    • IX Practical skill Science
  • X Sample Papers
    • 10th Board Exam Papers
      • 10th Mid Term Papers
      • 10th Sample Paper 2018-19
    • X Sample Paper SA-I
      • X Mathematics SA1
      • X Science SA1
      • X Social Science SA1
      • 10th English sa-1 paper
      • 10th Hindiand sanskrit sa-1 paper
    • X Sample Paper SA-II
      • Mathematics
      • Science
      • Science Practicals MCQ
      • Social Science
      • Hindi English and Sanskrit
  • CLASS 8
    • 8th Science
      • Class 8 Physics
        • Force Pressure and Frictions
        • Sound
        • Chemical Effects of Electric Current
        • Refraction of Light and Our Eyes
        • Some Natural Phenomenon
        • Stars and the Solar System
      • Class 8 Chemistry
        • Synthetic fibre and Plastics
        • Metals and Non-Metals
        • Combustion ,Flame and Fuel
        • Coal Petroleum, Natural Gases
        • Air and Water Pollution
      • Class 8 Biology
        • Crop Production and Management
        • Microorganisms friend and foe
        • Cell structure and functions
        • Reproduction in animals
        • Reaching the Age of Adolescence
        • Conservation of plants and animals
    • Class 8 Mathematics
      • Algebra
        • Rational Number
        • Square and Square Roots
        • Algebraic Expression
        • Factorization
        • Exponent and Power
        • Linear Equations
      • Commercial math
        • Unitary Methods
        • Percentage
        • Profit and Loss
        • Discounts & Sales Tax
        • Compound Interest
      • Geometry/Mensuration
        • Quadrilateral
        • Practical Geometry
        • Perimeter and Area
        • Data Handling
        • Introduction of Graphs
    • Class 8 Sample papers
      • 8th Question paper sa1
      • 8th Question paper sa2
  • CLASS 07
    • class 7 Science
      • class 7 Physics
      • class 7 chemistry
      • class 7 Biology
      • 7th Science Test Papers
      • 7th Science Solved Papers
    • class 7th Maths
      • Class 07 Maths Tem-I
      • Class 07 Maths Tem-II
    • Class7 Exam Papers
  • Class 06
    • 6th Maths
    • 6th science
      • 6th Science Term-1
      • 6th Science Term-2
  • NCERT Solutions
    • X Science and Maths
    • IX Science and Maths
  • Class 11 - 12
    • 12th Sample paper
    • 11th Study Material
      • 11th Physics
      • 11th Chemistry
      • 11th Maths
    • 12th Study Material
  • NTSE
    • NTSE SAMPLE PAPER