Science [1 Marks Each] QUE - ANS

All our routine works like walking, running, writing, etc. require bending of either our hands or our legs. We are able to bend different parts of our body due to joints only. If there were no joints, we would not be able to bend our limbs and hence we wouldn’t be able to perform many activities.

Duck and swan swim in water.

Air and water can flow around a streamlined body. Hence, the resistance of air and water is reduced.

The shape of a body in which head and tail of an animal are smaller than the middle portion of the body and the body tapers at both ends is called streamlined.

Cockroach walks on the ground and climbs on walls as well as flies in the air.

The special features like the streamlined body, conversion of forelimbs into wings, hollow bones of the birds help to fly.

Our body moves by the combined action of bones and muscles.

Cartilage is present in nose, ears, bronchi and between all the joints of our body.

The parts of the skeleton that are not as hard as the bones and which can be bent are called cartilages.

Joints are the places where we move our bones to do all our work like bending, walking, writing, etc.

A place where two bones meet and move with respect to each other is called a joint.

The bones in our body form a framework to give a shape to our body, this framework is called the skeleton.

The manner in which living organisms move from one place to another is called their gait.

Pelvic bones

Clavicle (Collar bone)

Snake

Legs and wings

Snail and earthworm

Hinge joint

Three pairs of legs and a pair of wings

Rib cage

Skull

Skull

Snail

By swimming

Bones present in the lower jaw are moveable.

A joint in which the rounded ball shaped end of a bone fits into the cup like cavity of the other bone is called ball and socket joint. Such a joint allows movements in all directions. The joint in our shoulders is ball and socket joint.