Minute movable bristles in earthworm help in gripping on the ground.

1

(a) False

(b) True

Bristles are not connected with muscles.

1

(a) True

(b) False

The human skeletal system is made up of 206 bones.

1

(a) False

(b) True

The forearm has two bones.

1

(a) False

(b) True

The cartilages are harder than bones.

1

(a) True

(b) False

The organ that protects the main nerve cord is

1

(a)

skull

(b)

backbone

(c)

breast bone

(d)

chest bone

Human skeleton comprises

1

(a)

skull and backbone

(b)

ribs and breast bone

(c)

shoulder and hip bone

(d)

All of the above

Snail moves with the help of its

1

(a)

shell

(b)

bone

(c)

muscular foot

(d)

whole body

Fixed joints are found in

1

(a)

lower jaw

(b)

skull

(c)

hands

(d)

hip bone

Which of the following organisms does not have both muscles and skeleton for movement?

1

(a)

Dog

(b)

Snail

(c)

Earthworm

(d)

Human being

A combination of bones and cartilages form the ____________ of the body.

1

(a)

skeleton

The contraction of the ____________ pulls the bones during movement.

1

(a)

muscle

__________ is strongest and longest bone of the body.

1

(a)

Thigh bone

Backbone is made up of____________ bones.

1

(a)

many (33)

Hinge joint is present in __________________ .

1

(a)

elbow

If there is no joints, then will it be possible to move? Explain.

2

(a)

Name two animals which move without bones.

2

(a)

Explain the adaptations of birds for flying in the air.

2

(a)

The number of bones differs in different parts of our hands. How many bones does middle finger have?

2

(a)

The movements of some parts/organs of the body are not under control. Can you name two such parts/organs.

2

(a)

Bones are hard structures and cannot be bent. But we can still bend our elbow, knee, etc. How is this possible?

3

(a)

Can you imagine how does an earthworm fix parts of its body to the ground?

3

(a)

Skeleton is made of bones but it has some cartilage too. Do you agree?

3

(a)

State the consequence if the backbone had only one long bone instead of many vertebrae.

3

(a)

We need two muscles together to move a bone.Why?

3

(a)

In the figure given below, there are two snakes of the same size slithering on sand. Can you identify which of them would move faster and why?

5

(a)

Rishi was playing football with his friends. While playing football he fell down and started crying. On seeing him crying, his friends rushed to him and found that he was unable to move his right leg. His friends took him to his house. His father immediately rushed him to a doctor. Doctor diagnosed that his leg was fractured.
(a) Can you suggest, how did doctor diagnose in Rishi's leg?
(b) What do X-rays show us?
(c) What are the values shown by Rishi's friends?

5

(a)