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CBSE_NCERT Chapter 6 Life Processes Solved questions

23/8/2018

1 MARKS QUESTIONS
1. A farmer floods his field everyday thinking that watering in this manner will result a better yield of his wheat crop. What will be the result of this action of the farmer.

Ans.This will result in water logging of the soil due to which roots cannot breathe and ultimately plants will die .

2. Name the term for transport of food from leaves to other parts of plants.

Ans.Translocation

3. Which pancreatic enzyme is effective in digesting proteins?

Ans.Trypsin

4. Which enzyme is present in saliva breaks down starch?

Ans.Salivary amylase.

5. After a vigorous exercise you may experience cramps in your leg muscles. Why does this happen?

Ans.Accumulation of lactic acid

6. Name the organelle in which photosynthesis occurs.

Ans.Chloroplast.

7. Name the type of blood vessels which carry blood from organs to the heart.

Ans.Veins.

8. Name the respiratory structures of i.Mosquito ii)earth worm.

Ans.i) mosquitoâ€”System of air tubes. ii)earth wormâ€”moist skin.

9. Write the two functions of kidneys.

Ans. Osmoregulation and excretion.

10. What are spiracles.

Ans The holes found on the lateral side of insectâ€˜s body.

2 MARKS QUESTIONS

1. Differentiate autotrophs and heterotrophs.

Ans.The organism which prepare their own food are called autotrophs for eg: green plants .

The organisms which depend on the food prepared by other organisms are called heterotrophs for eg: animals

2.Differentiate between aerobic respiration and anaerobic respiratrion.

Ans. Aerobic respiration
1. It occurs in the presence of oxygen .

2. Glucose is completely broken down to carbondioxide and water.

3. More energy is released 38 ATP.

Anaerobic respiration
1 .It occurs in the absence of oxygen

2. Glucose is incompletely oxidised to ethanol or lactic acid

3. Less energy is produced 2ATP

3. Explain the role of the following in the process of digestion in the human body

A) saliva

B) trypsin

a) saliva-

a) Saliva contains an enzyme salivary amylase which digests starch

b) trypsin.-helps in digestion of proteins.

4. What is double circulation.?

Ans..In double circulation blood goes through the heart twice during each cycle in vertebrates.

5 Write any two points of difference between respiration in plants and respiration in animals.

Respiration in plants.

1.In plants separate respiratory organs are absent
2.The rate of respiration is slow.
3.They lack respiratory surface

Respiration in animals

1.In animals respiratory organs are generally present

2.The rate of respiration is fast.

3. Respiratory surface is generally present.

6. Differentiate Holozoic nutrition and saprophytic nutrition.

Holozoic nutrition
In this nutrition organisms derive their food by consuming complex organic materials by the process of ingestion and then converting the complex molecules into simpler ones to obtain nutrients. Eg. animals and human beings.

Saprophytic nutrition
In this type of nutrition organism derive their food from the dead and decaying materials. Eg.fungi

7. Why do veins have thin walls compared to arteries?

Ans: Veins do not have thick walls because blood is no longer under pressure but blood emerges from the heart under high pressure. So arteries have thick walls

8. Where do the plants get each of the raw materials?

(a) CO₂ (b) water (c) minerals

Ans.

(a) CO₂- from air, (b)water-from soil (c)minerals-from soil along with water.

9. What do the following transport?

a)xylem and phloem c)pulmonary vein d) venacava

Ans.

a) xylem-water and minerals

b) phloem- prepared food.

c) Pulmonary vein-oxygenated blood

d) vena cava -deoxygenated blood

10. Write one function each of the following components of transport system in human beings. a)arteries b) veins c)capillaries

ans:

a) arteries- carry blood from heart to different parts of body

b) veins-carry blood from different parts of body to the heart.

c) Capillaries-exchange of material between blood and surrounding cells.

11. a) How is fat digested in our body? b) Where does this take place?

Ans.

A) fats are emulsified by bile salts. The emulsified fats are acted upon by pancreatic and intestinal lipase to form fatty acids and glycerol.

b) digestion of fats occurs in small intestine.

3 MARKS QUESTIONS

1. What is the function of epiglottis in man? Draw a labeled diagram showing the human respiratory system.

Epiglottis. It is an adjustable flap of fibro cartilage that covers glottis when food is being swallowed. Diagram of human reaspiratory system. Fig 6.9 (NCERT text book page no.104.)

3. What is known as double circulation Briefly explain the process .

Ans.It is passage of the same blood twice through the heart first on the right side, then on the left side in order to complete one cycle. It has two components ,pulmonary circulation and systemic circulation. Hint. pulmonary circulation and systemic circulation 4.How water is transported upwards in plants? Hint. Transpiration pull

5. Name the tissue that transports the prepared food in plants . Explain the mechanism of transport of food in plants.

Ans.: phloem Hint: translocation using energy from ATP. 6Briefly describe the excretory system in human beings. Hint a pair of kidneys a pair of ureters,a urinary bladder and a urethra.

7.Describe the functioning of nephrons.

Hint: filteration, reabsorbtion, secretion

8.What are the differences between the transport of materials in xylem and phloem hint transport in xylem:

water transport using transpirational pull Transport in phloem: food, transport using energy from ATP

9. Draw and label the sectional view of the human heart.

Diagram NCERT text book fig 6.10 page 106

10. dfifferentiate between osmoregulation and excretion excretion is the elimination of metabolic waste products from the body.

Osmoregulation is regulating osmotic pressure of the body fluids by controlling the amount of water and salts in the body

5 MARKS QUESTIONS

1. Write the process of digestion.

Digestion in mouth,stomach, duodenum,digestion in jejunum . Digestion of carbohydrates, digestion of proteins, digestion of fats

2.Which chamber of human heart receives oxygenated blood? Explain how oxygenated blood from this chamber is sent to all parts of the body.

Ans Left atrium

Hint. Explanation of systemic circulation

3.Draw the diagram of cross section of a leaf and label the following in it.

A) Chloroplast b)guard cell c)lower epidermis d)upper epidermis

Name the two stages in photosynthesis.

Ans Draw fig 6.1 NCERT text book page 96 Two stages light reaction and dark reaction

4.Draw a neat diagram of the human respiratory system and label the parts.

b)How are the alveoli designed to maximize the exchange of gases. Suggest any two features.

Draw fig6.9 and explain the structure and function of alveoli

5.a) Draw a diagram of human alimentary canal.
b) label the following on the diagram Esophagus, liver gall bladder, duodenum
c)What is the function of liver in human body

ans. : Draw fig 6.6 in page 99 of NCERT and label the parts mentioned. Liver. Secretes bile that emulsifies fats . Bile provide alkaline medium for digestion of proteins.

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10th Maths unit10 Constructions Solution hots question answers

3/1/2012

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CBSE X CONSTRUCTIONS (Maths)
Division of a Line Segment ,Construction of Tangents to a Circle,To construct a triangle similar to a given triangle as per given scale factor,To construct the tangents to a circle from a point outside it.
You will learn to do the following constructions :

1. To divide a line segment in a given ratio.

2. To construct a triangle similar to a given triangle as per given scale factor which may be less than or may be greater than 1.

3. To construct tangent at a point on a given circle.

4. To construct the pair of tangents from an external point to a circle

Q. Draw a circle of radius 3.2 cm. Take a point P on this circle and draw a tangent at P.(using the centre) Given: Radius of the circle = 3.2 cm.
Steps of construction(i) With O as the centre draw a circle of radius 3.2 cm.
(ii) Take a point P on the circle and join OP.
(iii) Draw an arc of a circle with centre at P cutting OP at L.
(iv) Mark M and N on the arc such that m(arc L M ) = m(arcMN)
(v) Draw the bisector PT of the angle <MPN
(vi) Produce TP to Tlto get the required tangent T'PT.

10th Geometry topic -Construction [Guess Question paper for CBSE Board]
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10th Carbon and its compound MCQ solved

24/12/2011

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JSUNIL TUTORIAL, SAMASTIPUR 10TH CARBON AND COMPOUND MCQ
Q1. Which of the following is not a saturated hydrocarbon ?

i) Cyclohexane. ii) Benzene.
iii) Butane iv) isobutene

Q2.The bond between two identical non metallic atom has a pair of electron ?

i) unequally shared between two atoms.
ii) Transferred completely from one atom to another.
iii) With identical spins
iv) Unequally shared between them.

Q3. Covalent compounds are generally

i) Soluble in water ii) Insoluble in water
iii) Ionize in water iv) Hydrolyse in water

Q4. Propane with the molecular formula C3H8 has
i)7covalent bonds ii)8 covalent bonds
iii)9 covalent bonds iv) 10 Covalent bonds.

Q5. A hydrocarbon reacts with ammonical cuprous chloride solution to form a red precipitate .
The hydrocarbon is
i)ethane ii)ethene
iii)butane iv)1-propyne

Q6.Which of the following substance is added to denature Ethanol ?
i)methanol ii)pyridine
iii)copper sulphate iv)all of them

Q7. Which of the following is not an allotropic form of carbon
i)fluorine ii)fullerene
iii)diamond iv)graphite

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Class X : HOTS Question Answers: Math Unit - 5 (Arithmetic Progression)

17/12/2011

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The fourth term of an AP is 0. Prove that its 25th term is triple its 11th term
Find the 20th term from the end of the AP 3, 8, 13……..253
If the pth, qth & rth term of an AP is x, y and z respectively,
show that x(q-r) + y(r-p) + z(p-q) = 0
Find the sum of first 40 positive integers divisible by 6 also find the sum of first 20 positive integers divisible by 5 or 6.
A man arranges to pay a debt of Rs.3600 in 40 monthly installments which are in a AP. When 30 installments are paid he dies leaving one third of the debt unpaid. Find the value of the first instalment
Find the sum of all 3 digit numbers which leave remainder 3 when divided by 5.
Find the value of x if 2x + 1, x2 + x +1, 3x2 - 3x +3 are consecutive terms of an AP
Raghav buys a shop for Rs.1,20,000.He pays half the balance of the amount in cash and agrees to pay the balance in 12 annual installments of Rs.5000 each. If the rate of interest is 12% and he pays with the installment the interest due for the unpaid amount. Find the total cost of the shop.

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Human Eye and Colourful World Sure shot Questions for Class X

10/12/2011

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The Human Eye and Colorful World FA - III (PAPER Pen Test)
Section A
Multiple choice questions: -
1. When we enter a cinema hall, we cannot see properly for a short time. This is because-a) Pupil does not open b) Pupil does not close
c) Adjustment of size of pupil takes some time d) None of these above
Ans: (c)
2. The property of persistence of vision is used in-
a) Short sightedness b) Long sightedness
c) Cinematography d) Colour vision
Ans: (c)3. Variable focal length of eye is responsible for-
a) Accommodation of eye b) Persistence of vision
c) Colour blindness d) Least distance of distinct vision
Ans: (a)4. A concave lens of suitable focal length is used for correcting a-
a) Myopic eye b) Hypermetropic eye
c) Both a and b d) nor a nor b
Ans: (a)5. Splitting of white light into seven colours on passing through the glass prism is called-a) Reflection b) Refraction
c) Scattering d) Dispersion
Ans: (d)
Section B
1. A person with a myopia eye cannot see objects beyond a distance of 1.5m. What would be the power of corrective lens? Which type of lens is used? (2)
2. What do you understand by myopia? Write two causes of it? (2)
3. What do you mean by far point and near point of eye? (2)
4. What is presbyopia? State the causes of it and How is it corrected? (3)
5. Explain: (3) 1) Why does sky look blue on a clear day 2) Twinkling of stars.
6. What is Hypermetropia? State two causes of Hypermetropia with help of ray diagrams show
i) The eye defect hypermetropia.
ii) Correction of Hypermetropic by using a lens. :(5 mks)
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10th Human eyes and Colorful World (Sure shot For CBSE Board Examination)

10th Human eyes and Colorful World (Sure shot Test paper and Sample paperFor CBSE Board Examination)

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Our Environment:CBSE 10th:Science Question Papers

29/10/2011

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POINTS TO REMEMBER:

1) ECOLOGY – The study of the interaction of living organisms with each other and
their surroundings is called ecology.

2) ENVIRONMENT – Everything that surrounds organisms and influences its life.

a) Biotic components of environment --- The living organisms .e.g.
Plants and animals.

b) Abiotic components of environment --- The nonliving components
like water, air, light, etc.

It is the sum total of all external conditions and influences that affect the life and the development of organisms i.e.,it includes all the biotic and abiotic factors.

3) ECOSYSTEM – All interacting organisms in an area together with the nonliving
constituents of environment. (Functional unit of an environment)

Functions of ecosystem:-
a) Flow of energy
b) Cycling of nutrients(bio-geo chemical cycles).

4) PRODUCERS --- They make the energy from sunlight available to the rest of the
ecosystem.

5) CONSUMERS --- Animals can not manufacture their own food. They are called
consumers.

6) BIODEGRABLE ---- Substances that are broken down by the action of bacteria or
other saprophytes. e. g. – Paper.

7) NONBIODEGRABLE --- Substances that are not broken down by the action of
bacteria or saprophytes. e. g. Plastic.

8) FOOD CHAIN ---- The process of one organism eating the other.

GRASS -> GRASSHOPPER -> FROG -> SNAKE

Importance of food chain

1.It helps in transfer of food energy from one organism to another.

2.It is a pathway for the flow of energy.

3. It helps in understanding the interdependence amongst different organisms.

Trophic levels are the various steps in the food chain .

Producers --- first trophic level

Herbivores --- second trophic levels

Carnivores --- third trophic level

Top carnivores --- fourth trophic level

9) FOODWEB ----- It is a network of food links between populations in a community.

10) FLOW OF ENERGY -Ten percent law Energy available at each successive trophic level is 10 % of the previous level. (Lindeman 1942)

The law states that, “ only a 10 % amount of the total available energy is transferred from one trophic level to the next. The rest 90% of energy is used up or lost to the surrounding.”

11) BIOLOGICAL MAGNIFICATION --- Progressive accumulation of nonbiodegradable waste at various trophic levels of food chain.

12. Differences between food chain & food web
Food chain
1. The process of eating & being eaten to transfer food energy.
2. It forms a part of food web.
3. It has limited populations.
Food web
1. It is a system of interconnected food chains.
2. It contains many food chains.
3. It has several populations of different species.

13. HOW DO OUR ACTIVITIES AFFECT THE ENVIRONMENT?
Two major problems:-
a) Depletion of ozone layer
b) Disposal of wasteGood ozone and bad ozone

The thick blanket of ozone layer in the atmosphere which forms a protective cover & prevents UV radiation from reaching the earth‘s surface. This is called good ozone and is found in the stratosphere. Ozone when present in the troposphere act as a pollutant . This harmful ozone is called bad ozone.

14. Depletion of ozone layer : The ozone layer protects all the organisms from the harmful ultra violet rays.
Ozone depleting substances: CFCs, N2O, CH4 , CCl4
These chlorine containing compounds are used in:
Aerosols, solvents, refrigerants and fire extinguishers.
Ozone hole developed over Antartica.

15. Effects of ozone depletion on human health- Due to depletion of ozone layer UV radiations reaches the earth and cause:
i) skin cancer ii) increased chances of cataract
iii) suppression of immune system . Managing the garbage we produce

16. Reasons for large production of garbage
i) Improvement in life style
ii) Changes in attitude (more things become disposable)
iii) Population explosion iv) Changes in packaging(non -biodegradable)
More topics to read
FORMATIVE ASSIGNMENT - III 10th Our Environment
10th Our Environment HIGHER ORDER THINKIN SKILLS (HOTS) QUESTIONS
10th physics Chapter - 15 Our Environment POINTS TO REMEMBER

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CBSE MATHS Assignment Co-ordinate Class X

11/10/2011

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Q1. Find the co-ordinates of a point which divide the segment AB in the ration 3:5 internally, where A(4 , –1 ) and B(–2, 4).

Q2. Find the co-ordinates of points of trisection of the segment joining points (4, –8) and (7, 4).

Q3. In what ratio does the point (3, 12) divide line segment joining the points (1, 4) and (4, 16)?

Q4. Determine the ratio in which the line 3x + y – 9 = 0 divides the segment joining the points (1, 3) and (2, 7).

Q5. Find the point which represent 3/4 of the distance from (3, 2) and (–5, 6).

Q6. (a) In what ratio the line segment joining the points (–2, –3) and (3, 7) divided by y-axis? Also, find the co-ordinates of the point of division.
(b) In what ratio the line segment joining the points (2, –3) and (5, 6) divided by y-axis? Also, find the co-ordinates of the point of division.

Q7. If A (5, –1), B (–3 , –2) and C (–1, 8) are the vertices of ∆ABC, find length of median through A And also find the co-ordinates of the centroid.

Q8. Find the co-ordinates of vertices of triangle, if the co-ordinates of mid points of sides of the Triangle are:
(a) (3, 2) , (4, 4) and (1, 3)   (b) (3, 4) , (4, 1) and (2, 0)

Q9. Find co-ordinate of centroid of triangle whose vertices are:
(a) (–2, 1) , (–3, 4) and (8, –11) (b) (–2, 4) , (7, –3) and ( 4, 5)

Q10. Find the third vertex of triangle, if its two vertices are (–4, 1) and (5, 2) and its centroid is (1, 3).

Q11.Three consecutive vertices of a parallelogram are (–2, –1), (1, 0) and (4, 3). Find its fourth vertex.

Q12. Find the co-ordinates of points which divide the line segment joining the points (–4, 0) and (0, 6) in four equal parts.

Q13.Find the value of x such that PQ = QR, where the co-ordinates of P, Q and R are (6, –1), ( 1,3) And (x, 8).

Q14. Find the point on x-axis which is equidistant from points (7, 6) and (–3, 4).

Q15. A line segment joining the points (3, –4) and (1, 2) is trisected at the points P and Q. If the co-ordinates of P and Q are (p, –2) and (5/3, q) respectively. Find p and q.

Q16. Determine ratio in which the point P(m, 6) divides the join of A(–4, 3) and B(2, 8). Also find m.

Q17. Prove that the four points whose co-ordinates are (0, 5), (–2, –2), ( 5, 0) and (7, 7) form rhombus.

Q18.Prove that (–5, 6), (3, 0) and (9, 8) are the vertices of an isosceles right-angled triangle.

Q19. The co-ordinates of the mid points of the sides of a triangle are (1, 1) , (2, –3) and (3, 4). Find The co-ordinates of its centroid.

Q20.If two vertices of an equilateral triangle are (0, 0) , ( 3,√3 ), find the third vertex.

Q21. Find the lengths of the medians of a ∆ABC whose vertices are A (7, –3) , B (5, 3) and C (3, –1).

Q22. The line joining the points (2, 1) and (5, 8) is trisected at the points P and Q. If point P lies on the line 2x – y + k = 0, find the value of k.

Q23. If the point (x, y) is equidistant from the points (a+ b , b –a) and (a – b, a + b), prove that bx = ay.

Answers
Ans 1.(7/4, 7/8)
Ans2. (5, –4) and (6, 0)
Ans3. 2:1
Ans4. 3:4
Ans5.( –3, 5)
Ans6. (a) 2:3 and (0, 1)(b) 1: 2
Ans7.65 and (1/3, 5/3)
Ans8. (a) (0, 1) , (6, 3) and ( 2, 5)(b) (1,3) , (5, 5) and ( 3, –3)
Ans9.(a) (1, –2)(b) (3, 2)
Ans10. (–1, 3)
Ans11. (1, 2)
Ans12. (–3, 3/2) , (–2, 3) and (–1, 9/2)
Ans13. 5 or –3
Ans14. 3
Ans15. p = 7 /3 and q = 0
Ans16. 3:2 , m =–2/5
Ans19. (2, 2/3)
Ans20.(0,2√3 ) or (3, -√3)
Ans21. 5, 5,√10
Ans 22. –8

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CBSE MATHS Assignment Co-ordinate Class X

11/10/2011

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Q1 A ladder 15 m long just reaches the top of a vertical wall. If the ladder makes an angle of60°with the wall, find the height of the wall.                                                                                  (7.5 √3 )

Q 2 A pole 12 m high casts a shadow 4 √3 m long on the ground. Find the angle of elevation      (60°)

Q 3 The angle of elevation of the top of a tower from a point on the ground is 30° if on walking 30m towards the tower, the angle of elevation becomes 60°.Find the height of the tower.(15√3 )

Q 4 An observer 1.5m tall is 20.5m away from a tower 22m high. Determine the angle of elevation of the top of the tower from the eye of the observer.                                       (45°)

Q 5 An aero plane when flying at a height of 5000m from the ground passes vertically above another aero plane at an instant when the angles of the elevation of the two planes from the same point on the ground are 60° and 45° respectively. Find the vertical distance between the aero planes at the instant. (2116.5m)
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CBSE_NCERT Chapter 6 Life Processes Solved questions

10th Maths unit10 Constructions Solution hots question answers

10th Carbon and its compound MCQ solved

Class X : HOTS Question Answers: Math Unit - 5 (Arithmetic Progression)

Human Eye and Colourful World Sure shot Questions for Class X

Our Environment:CBSE 10th:Science Question Papers

CBSE MATHS Assignment Co-ordinate Class X

CBSE MATHS Assignment Co-ordinate Class X

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