CBSE Class 8 Science Chapter Wise Question Bank Set D

 

 

Chapter 9- Reproduction in Animals

Q1. Name the following

1. Two modes by which animals reproduce.

2. The production of an exact copy of a cell or any other living part.

3. The process that ensures the continuity of similar kinds of indiviuals.

4. The fertilised egg is also known as.

5. The type of fission in Amoeba.

6. Two animals which show metamorphosis.

7. Babies born through the technique of invitro fertilisation.

8. Two animals showing external fertilisation.

9. Two animals showing internal fertilisation.

10. Name the scientist who cloned an animal for the first time sucessfully.

Q2. Differentiate between oviparous and viviparous organisms.

 

Q3. Tick the correct answer

1. Which one is not the oviparous animal?

a) Hen

b) Butterfly

a) Frog

c) Dog

2. Hydra reproduce by

a) Fragmentation

b) Budding

c) Binary fission

3. Tadpole is the developing stage of

a) Human

b) Frog

c) Fish

4. A type of cloned sheep is

a) Jolly

b) Dolly

c) Molly

5. The fusion of male and female gamete is called

a) Fertilisation

b) Fission

c) Metamorphosis

 

Chapter 10- Reaching the age of Adolescence

Answer the following questions

1. Name the hormone produced when one is very angry or worried.

2. The chemicals secreted by endocrine gland are called _________.

3. How many pairs of chromosomes are found in the nuclei of their cell?

4. Why endocrine glands are termed ductless glands?

5. Name the disease caused due to lack of insulin producation.

6. Name the hormone that controls metamorphosis in a frog. Name the mineral required by this hormone.

7. Name the gland which controls the activity of other endocrine glands.

8. Name the hormone which maintains the correct salt balance in the blood.

9. Name three glands which release their secretions through ducks.

10. Name the hormone produced by thyroid gland and the disease caused due to lack of its producation.

 

CHAPTER 11 : FORCE AND PRESSURE

I. Answer the following :

1. A push or pull on an object is called a ______________.

2. The state of motion of an object is described by its __________ and the direction of motion.

3. The force resulting due to the action of muscles is known as _____________ force.

4. Muscular force is also called as _____________ force.

5. The force exerted by a magnet and electrostatic force are examples of _____________ force.

6. Every object in the universe exerts a force on every other object called a _____________ force.

7. The force acting on a unit area of a surface is called _____________.

8. Pressure in liquids _____________ with the increase in depth of the liquid column.

II. Choose the correct answer:

1. Which of the following will exert the maximum pressure on ground while moving

a) an elephant b) A girl wearing a pencil heel

c) Rhinoceros d) Camel

2. Force can change

a) Only position of object b) Only speed of object c) Only direction of moving object d) All the above

3. Which of the following is not a non-contact force

a) gravitational force b) electrostatic force

c) muscular force d) All of them

4. A force has

a) magnitude b) direction

c) both of them d) None of them

5. Which type of force is acting when hair is being pulled by a charged comb

a) Contact force b) Non-contact force

c) both of them d) None of them

 

Lesson 12- Friction

I. Fill in the blanks :

1. The force of friction always act in the _____________ direction to the applied force.

2. _____________ comes into play when we try to move an object at rest.

3. _____________ comes into play when an object is sliding over othe object.

4. Sliding friction is always _____________ than static friction.

5. Friction can be _____________ by using lubricants.

6. Friction is the force which _____________ the relative motion between two surfaces.

7. Friction can be increased by making a surface _____________.

8. The friction force exerted by fluid is also called _____________.

9. The common name of gases and liquids is _____________.

10. Name the device used for measuring the force acting on an object _____________.

II Answer the following

1. Name two methods of reducing friction.

2. Why the soles of shoes and tyres of cars, truck etc are grooved.

3. What is the cause of friction.

4. How the fluid friction can be minimized.

 

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