1. Fill in the blanks:-
(a) New cells are formed from pre-existing cells.
(b) Movement of water molecules from their higher concentration to their lower concentration through a semi- permeable membrane is called Osmosis.
(c) The functional components of cell are plasma membrane, cytoplasm & nucleus.
(d) Protoplasm has two parts- cytoplasm & nucleoplasm.
(e) Nucleus, mitochondria & plastids have their own DNA & ribosomes.
(f) The shrinkage or contraction of the contents of the cell away from the cell wall is known as plasmolysis.
(g) The process by which Amoeba can engulf a food particle is endocytosis.
(h) Biogenesis is the manufacture of lipids required for making cell membrane.
(i) A cell that lacks nuclear membrane is called a prokaryotic cell & the nuclear region is called nucleoid.
(j) Movement of materials in & out of the cell takes place by diffusion & osmosis.
2. What is the advantage of multicellularity over unicellularity?
Ans- Division of labour.
3. What are the chromosomes made up of?
Ans- DNA & proteins
4. A cell placed in a solution swells up. What kind of solution is it? Why does it happen?
Ans- It is a hypotonic sol ution & water enters the cell by endosmosis causing the cell to swell up.
5. Why are lysosomes known as “suicidal bags”?
Ans- They secrete powerful digestive enzymes to digest the worn out and damaged cell
organelles as well as the cell itself when it loses its functional ability.
6.Why is the nucleus so significant in a cell?
Ans- Nucleus has the following important functions-
(i) It controls all cell activities
(ii) It contains hereditary material that transmits hereditary information from one
generation to the next
(iii) It helps in cell division
7. Differentiate between plant and animal cells.
1. PLANT CELL
1- Surrounded by two membranes- cell wall & cell membrane.
2- Possess three types of plastids chloroplasts, chromoplasts, leucoplasts.
3- Do not possess lysosomes.
4- Nucleus is towards the periphery.
5- Centrioles are absent
1- Surrounded only by cell / plasma membrane.
2-Do not possess plastids.
3-Possess lysosomes4-Nucleus is in the center ..
5-Centrioles present & help in cell division.
8. Give the major functions of the following cell organelles-
(a) Endoplasmic reticulum
RER-- Synthesis of proteins as it has ribosomes attached to it
SER- Synthesis of lipids required for making cell membrane
(b) Golgi apparatus-----------Storage & packaging of various products.
(c) Mitochondria------Production of ATP(Adenosine Triphosphate) which is a source of energy.
(d) Ribosomes ---Protein synthesis
(e) Golgi ApparatusStorage & packaging of various products.
f) LysosomesDigestion of worn out & damaged organelles
CBSE SOLVED TEST PAPERS CLASS - IX Science (Is matter around us pure)
Q. What is distillation?
Ans: Distillation is a method of separating mixtures based on differences in their boiling points. The compound which have higher boiling point will distillate later while the compound which have lowest boiling point will distillate out first.
Q. How is blood a heterogeneous substance?
Ans: Blood is a heterogeneous mixture because it a mixture of plasma, blood cells, glucose, proteins, mineral ions, hormones and many different salts dissolved in it. Thus the dispersed phase and dispersed medium are in different physical state and hence a heterogeneous mixture
Q. Calculate the mass of sodium sulphate required to prepare its 20% ( mass percent ) solution in 100g of water?
Ans: Mass % of Sodium sulphate in the solution = 20%
If the total mass of the solution = 100g Then mass of sodium sulphate = (20/100)x100 = 20 g
Mass of water = 100-20 = 80 g.
Q. Arun has prepared 0.01% ( by mass ) solution of sodium chloride in water, calculate the composition of soltution. How do you do it ?
Ans: Mass % of solute = 0.01 % of NaCl in water
Mass % of solute = [Mass of solute in grams / Mass of solution in grams] x 100.
Let us suppose that mass of the solution is 100 g.
Therefore mass of NaCl = 0.01 g
Mass of water = 100-0.01 = 99.99 g.
Q. How to separate components from mixture containing sulphur, charcol , pottasium nitrate?
Ans: The mixture containing sulphur, charcoal and potassium nitrate can be separated by following technique:
A. Add water to the mixture. Potassium nitrate will dissolve in water. Filter the solution.
B. Filterate is solution of potassium nitrate and residue contains sulphur and charcoal.
C. Evaporate the filterate, water will vapourize leaving behind potassium nitrate.
D. To the residue containing sulphur and charcoal add carbon disulphide, this will dissolve sulphur.
E. Filter this solution.
F. The filtrate will contain sulphur dissolved in carbon disulphide and residue will be charcoal.
G. Evaporate the filtrate, to obtain crystals of Sulphur.
Q. Acetone evaporates in normal room temp. Why do we have to heat it to its boiling point?
Ans: At room temperature the rate of evaporation of acetone is slow, to speed up the process to evaporate all the acetone in the mixture, we supply heat.
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X Triangles :Criteria for Similarity of Triangles Solved:
The surroundings where organisms live naturally are called its habitat.
Plants and animals have special features that help them to survive in their own habitat
Habitat can be terrestrial or aquatic.
Terrestrial habitat: the land where all plants and animals survive is called territorial habitat .For example: deserts, forests and grasslands, as well as coastal and mountain regions. Camels and cactus plants live in deserts only.
Aquatic habitat: The water where plants and animals survive is known as aquatic habitat like rivers, ponds, lakes, ocean and swamps. For example, fish live in water.
Adaptation: Plants and animals develop certain habits that help them survive in their surroundings, and this is known as adaption.
Acclimatization: The small adjustments by the body to overcome small changes in the surrounding atmosphere for a short period of time are called acclimatization.
Biotic and Abiotic components: These are living and non living components of a habitat .
Biotic components include all the livings organisms in a habitat like plants and animals .it is further classified into producers ,consumers , scavengers’ and decompose
Abiotic components include all the non-living things in a habitat like air, water, soil, sunlight and heat.
Q. What is the name for food producer?
Q. Is desert habitat terrestrial or aquatic?
Q. What is the term used to describe the response of plant and animals to light?
Ans: Photo tropism
Q. What we name the Plants growing in dry desert area ?
Q. What is decomposer?
Ans: Organism that feed on the dead and decay remains of plants and animal is called decomposer. Eg. Microorganism like bacteria and fungi.
Q. How are decomposes helpful to us?
Ans: Decomposer help to break down dead plants and animal into organic matter that increase fertility of soil .
Q. What are scavengers?
Ans: Living organism feed on dead animals helps to clean environment are called scavengers like vulture, crow , jackal etc.
Q. What type of consumer are carnivores?
Ans: Secondary consumer as the feed indirectly on plants for example tiger , lions, wolves etc
Q. State any two flight adaptation seen in areal animals?
Ans: Two flight adaptations seen in areal animals are: (a) Body modified like boat to minimize air resistance
(b) The limbs are modified into wings
Q. Define: (a) Epiphytes (b) Pneumatic bones (c) Nictitating membrane
Ans: (a) Roots of some plants like Spanish moss and some fern grow on other plants or tree to get sunlight is known as Epiphytes.
(b)The animals that can fly have hollow bones that are called Pneumatic bones. Like bones of birds
(c) The membrane that protect eyes of fish under water is called Pneumatic bones
Q. What are the adoptation seen in desert plants?
Ans: The adaptations seen in desert animals are:
(a) Store extra water in their body
(b) Lives in deep borrow
(c) Try to avoid body contact with hot ground
(d) Having long eye lash to protect eyes from sand
Q. How does temperature affect plants and animals?
Ans: Temperature affects the structure of leaves and stem of plants. Temperature affects the colouration of some birds and animals. Temperature also affects the size and body parts of animals.
Q. Biotic and abiotic component are dependants on each other Explain?
Ans: Animals depends on plants for food. Plants depend on light, air, soil and water for preparation of food. Therefore, biotic components directly or indirectly depend on abiotic components. Decomposers break down dead biotic components into organic matter that enrich soil. Photosynthesis help to maintain balance of gases in air and water in nature.
Q.What we call the plants that grow in moist habitat?
Q. what is the meaning of oviparous and viviparous
Ans: Oviparous are those animals which lay eggs example- crow, lizard where as viviparous are those animals which do not lay eggs and give birth to young ones for example- lion, dog.
Q. How is a cactus adapted to survive in a desert?
Ans: Cactus has a waxy surface with lots of water in it. it also has thorns to prevent loss of water. This is how it lives in the desert. it also lives just because of its thick fleshy stem.
Q. What is acclimisation?
Ans: The small problems some time occur in the body of organism over short period , The process of overcoming small changes in the surroundings is called acclimisation.
Q. How do plants and animals adapt themselves?
Ans: Plants and animals adapt themselves to different surroundings with the help of adaptive features they have. For Example: Presence of wings, flight muscles and a stream-lined body helps birds in flight. Birds also have hallow bones that make their body light. Presence of fur on the body of the polar bear which protects it from the cold temperature.
Q. Write two adaptive features in frog which help them to stay both of them water and land.
Ans: Frogs have moist skin for exchange of gases in water and they have lungs to breath in air
Q. Give reasons:
(a) Why are deep sea worms blind?
(b) Why are some marine creatures living in the deep sea give out light of there of own? (c) Why the upper surface of the leaves of lotus have a thick cuticle ?
Ans: a. As we move deep into seas and oceans the amount of light or the visibility decreases. Deep sea worms are blind because of the lack of requirement. Some worms have large eyes but those are not for the purpose of seeing. These worms have developed strong sense of smell to encounter these problems.
b. Since there is lack of light in deep seas, some organisms can give out light to assist them in finding their way in the dark. This also helps them in finding prey to feed on and can also be used to find a mating partner.
C. Lotus is an aquatic plant. The leaves of the lotus plant have a thick waxy cuticle that helps in repelling water and keeps the stomata open so that water transport occurs effectively in plant
Q. why do cockroaches hide their face when sunlight falls on them?
Ans: Cockroaches have some light receptors cells in their eyes which cannot tolerate the high intensity light. This is the reason why they run toward darker areas during sunlight.
Things, which do not grow, move, or respond are called non-living things.
Things that grow, breathe, and respond are called living things.
PROPERTIES OF LIVING THINGS
(a) All living things grow: Infant grows into a child, Plants grow from seeds, Puppies grow into dogs, and kittens grow into cats.
(b) All living things can move: Living things move from place to place in search of food iscalled Locomotion
(c) All living things need food to live: Living things eat food to get energy to live.
(d) All living things Respire: Living things eat and digest foods that get oxidized in body to release energy. This process is called Respiration. Respiration occurs inside body. Exchange of carbon dioxide and oxygen in living body is called breathing. Breathing occur outside the body. Plant breath through stomata and animal through nose. Small animal and microbes exchange gases by diffusion.
(e) All living things reproduce: Living things can produce young one of similar kinds. This process is called reproduction. Some animal give birth to young ones like dog, cow; Some animal lay eggs like bird, hen ; Plant grow from seeds ,stem and root etc.
(f) All living things respond: Living things can respond against touch, heat, light and gravity called stimulus. Change in our surrounding that make living things respond to them, are called stimuli. Touch me not plant show response to touch and its leaves hang down.
(g) All living things are made up of different kinds of cells. Group of cell is called tissue. Group of tissue is called organ. A group of organs is called organ system that work together to keep our body live.
(h) Living things excrete: Living Things throw waste outside body like sweat, urine, faeces. This process is called excretion. Plants excrete gum, leaves, latex etc
Q. What is habitat?
Answer: The surroundings where plants and animals live, is called their habitat. The presence of specific features, which enable a plant or an animal to live in particular habitat, is called adaptation.
Q. Which organism grow throw their lives
Q1. Define force and its SI unit?
Q 2. Distinguish between balanced and unbalanced force?
Q3. State three laws of motion?
Q 4. What is inertia? Is inertia vector quantity. Justify?
Q5. What is impulse? Prove that Impulse is equal to change in momentum?
Q. 6. Define momentum and Prove that F = ma
Q 7. Is it possible that a body keeps on moving with uniform velocity with? If yes give reason also name scientist who explained this statement?
Q 8. Why a person sitting in bus fall forward when moving bus suddenly stops?
Q9. Why people sitting in bus fall backward when bus suddenly starts?
Q10. Why dust fall on beating carpet with stick?
Q11. Why leaves fall when we are shacking branch of tree?
Q12. Why an athlete runs certain distance before taking long jump?
Q13. When bus takes u turn, passengers sitting inside thrown a side. Why?
Q14. Explain why it is difficult for a fireman to hold a hose, which ejects large amount of water at a high velocity.
Q15. How a karate player can break a pile of tiles with a single blow of his hand?
Q.16. Why does a bullet when fired against a glass window pane make a hole in it, and the glass pane will smash it?
Q.17. Why is it advised to tie a rope on the luggage while you travel by the bus?
Q18.Why vehicles are provided with shocker?
Q19. Why does a bicycle begin to slow down when we stop pedaling?
Q20. State and verify the law of conservation of momentum?
Q21. When we hit at the bottom of the pile of carom coins, other coins fall vertically on the carom board why?
Q22. Two balls A and B of masses 'm' and '2 m' are in motion with velocities '2 v' and 'v' respectively. Compare
(i) their inertia (ii) their momentum and (iii) the force needed to stop them in the same time
Q 23. A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40,000 N and the track offers a friction force of 5,000 N then calculate:
(a) the net accelerating force (b) the acceleration of the train (c)the force of the wagon 1 on rest of the wagons.
Q 24.According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the road side, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move.
Q25.A machine gun can fire 50 g bullets with a velocity of 150 m/s. A 60 kg stone is moving towards the machine gun velocity of 10 m/s. How many bullets must be fired from the gun to just stop the stone in its tracks?
Class IX Science SA-1 Quick Links
IX Motion and rest IX Force and Law of motion
IX Gravitation IX Matter in our surrounding
IX Is matter around us pure IX Biology Term-1
What is an equation?
A statement which contains the equal sign = is known as an equation.
eg; 2x -4x=2x , 45=0
1. The sum of the ages of anup and his father is 100. When anup is as old as his father now, he will be 5 times as old as his son anuj is now. Anuj will be eight years older than anup is now, when anup is as old as his father. What are their ages now?
Let the present ages (in years) of Anup’s father,
Anup and Anuj be x, (100 – x) and respectively.
Difference between Anup’s father and Anup’s ages (in years)
= x – (100 – x) = x – 100 + x = 2x – 1002x – 100 years
later, Anup will be x years old and 5 times old as Anuj is now.X = 5y
y = x/5 -----------(i)
When Anup is x yr old,then Anuj will be y +(2x-100)yrs old and 8yrs older than Anup is nowTherefore y + (2x-100) = (100 – x ) + 8 -------------(ii)
On putting y = x/5 from (i) we get
X = 65 yrs
So Anup’s fathers age = 65 yrs,
Anup’s age = 100-65 = 35 yrs ,
Anuj ages = x/5 = 65/5 = 13 yrs
2. I am currently 5 times as old as my son. In 6 years of time I will be three times as old he will be then. What are our ages now?
Let the Age Of Me Be 5x And Sons be x.
After 6 Years 5x+6 And x+6
It is Given that I Would Be Three Times The Age Of My Son
5x+6 = 3(x+6)
5x+6 = 3x+18 Þ 5x-3x = 18-6
2x = 12Þx = 6
So My Age = 6x5 = 30
Answer: My Age- 30 Years, Sons Age 6 Years
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1. Define : gravitation, gravity and gravitational force.
2. State the universal law of gravitation and its mathematical form.
3. In what source is ‘G’ universal?
4. What happens to the force of attraction between two objects when (i) Their mass are halved?
(ii) Distance between them is increased to 4 times its previous value. (iii) Distance between them as well as each of the mass is increase to 4 times.
5. If the distance between two bodies is increased 4 times by what factor should the mass of the bodies be altered so that the gravitational force between them remains the same?
6. What is the force between two spheres weighing 20 kg each... Read more »
The term "magnetic effects of current " means that " a current flowing in a wire produces a magnetic field round it ". the magnetic effect of current was discovered by Oersted found that a wire carrying a current was able to deflect a magnetic needle. It concludes that a current flowing in a wire always gives rise to a magnetic field round it.
The region around a magnet where the force of attraction or repulsion can be detected is called magnetic field.
Magnetic field around a magnet can be detected by using a magnetic compass.
Magnetic field lines :-
Magnetic field lines are the paths around a magnet along which the north pole of a magnetic compass needle tends to move.
The magnetic field lines around a magnet can be observed by sprinkling iron filings around a magnet. It can also be observed by moving a magnetic compass around a magnet.
i) The magnetic field lines emerge at the north pole and merge at the south pole.
ii) The magnetic field lines are closer at the poles.
iii) The magnetic field lines do not intersect each other.Magnetic field due to a current carrying conductor :-If a magnetic compass is placed near a conductor carrying current (wire), the needle is deflected. This shows that a conductor carrying current has a magnetic field around it.
If the direction of the current is from north to south, the deflection of the magnetic needle is towards the east.If the direction of the current is from south to north, the deflection of the needle is towards the west.
The magnetic field around a current carrying straight conductor is in concentric circles. It can be observed by passing a current carrying straight conductor through a cardboard and sprinkling iron filings on it.
X Magnetic Effects of Currents Notes
X Magnetic Effects of Currents CBSE Test Paper - 1
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X Magnetic Effects of Currents CBSE Test Paper - 3
X Magnetic Effects of Currents assignment for FA - 1
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