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The number bones present in an adult human is 206.

Skeleton is made up of many bones, joints and cartilage.

Correct answer is (c) Pelvic

(c) Upper jaw and skull

(a) Joints of the bones help in the movement of the body. 

(b) A combination of bones and cartilages forms the skeleton of the body. 

(c) The bones at the elbow are joined by a hinge joint. 

(d) The contraction of the muscles pulls the bones during movement.

(a) Joints of the bones help in the movement of the body.
(b) A combination of bones and cartilages forms the skeleton of the body.
(c) The bones at the elbow are joined by a hinge joint.
(d) The contraction of the muscle pulls the bones during movement.

(b) Pelvic bone

Correct answer is (a) Ankle

(c) muscular foot

1 – d,
2 – g,
3 – e,
4 – f,
5 – a, c

Lower jaw bone is the only movable bone in the skull bone.

The hollow space in the bone is called cavity.

The arm rotates on the round pit-like structure.

Elbow and knee are not made up of a single bone, but two or more bones which are joined to each other by a joint (Hinge joint). This joint along with the muscles help us to bend the elbow and knee.

No we can bend our body only at joints.

(a) swim easily in water.

The doctor must have observed a swelling and taken an X-ray of the ankle. X-ray images confirm injuries/fractures in bones.

Some additional parts of the skeleton which are not as hard as bones and are elastic in nature and can be bent are called cartilages. 

Eg: Cartilage of ear.

(a) A ball and socket joint is a moveable joint. It has a rounded end of one bone fit into the cavity (hollow space) of the other bone. It allows movement in all directions. Example: shoulder joints.
(b) Only the lower jaw in skull bones is movable.
(c) Elbow joint is an example of hinge joint which allows only back and forth movements. Therefore, we cannot move our elbow backwards.

Plaster keeps broken bones at their right place so that they grow and join properly.

The following adaptations are seen in the body of birds. 

1. Bones are hollow 

2. Fore limbs are modifies into wings 

3. Body is streamlined

Contraction and relaxation of muscles and bones and joints help in movement.

If the body tapers at both the ends then such, shape of the body is said to be strealined.

A muscle can Pull only.

(a) False

(b) True

(c) True

(a) False

(b) False

(1) The bony frame work which gives shape to the body is called skeleton. 

(2) The skeletal system is comprised of bones, ligaments and cartilage.

The changing position of the body or any part of the body is called movement.

An earthworm eats its way through the soil. Its body excretes the undigested materials that makes the soil fertile.

(1) Small bones that make up the back one are known as vertebras 

(2) Give an example of pivot joint The joint between head and neck is a pivot joint 

(3) Movement is brought about by the contraction and relaxation of muscles.

Vertebral column of man has 33 bones.

1. Earthworm 

2. Snail

Elbow joint has hinge joint. This joint allows movement in a plane only and hence it is not able to move backwards.

A snake forms loops in its body while slithering. Each loop of the snake gives it a forward push by pressing against the ground. The snake with a large number of loops moves much faster than the snake with less number of loops. Thus snake “A” will move faster than snake “B”.

The body of fish is streamlined. The streamlined shape helps the fish to move in water. The skeleton of fish is covered with muscles which make the front part of the body to curve to one side and the tail part swings towards the opposite side. This makes a jerk and pushes the body forward. In this way it moves in water.

(c) earthworm 

In a ball and socket joint, the rounded end of one bone fits into the cavity (hollow space) of the other bone. It can allow movements in all directions.