Body Movements

We not able to move our upper jaw because the joint between our upper jaw and rest of the head is a fixed joint.

The joint that allows only back and forth movement is hinge joint. Example-joint at our elbow.

Ribs join the chest bone and back bone together to form box called rib cage.

Earthworm can move by muscle expansions and contraction. Its body secrete a slimy substance to help in movement.

Birds can fly because their body is well suited for flying. Their bones are hollow and light. Also the bony parts of forelimbs are modified as wings.

Fishes have streamlined body which helps them to swim. Fins of the tail also help fish to swim.

Under its body, earthworm has a large number of tiny bristles projecting out. The bristles are connected with the muscles and they help to get a good grip on the ground.

The snake body curves into many loops. Each loop of snake gives it a forward push to move forward very fast but not in straight line.

Bones are very hard but cartilage is not as hard as the bones.

The earthworm eats its way through the soil. Its body then throw away the undigested part of material that is eats. This activity of earthworm makes soil more useful for plants.

Snake, fish, bird.

a, c, d are true.

The breast bones are modified to hold muscles of flight which are used to move wings up and down.

Muscles near the legs of cockroach help the cockroach in walking.

Its body secrete a slimy substance to help in movement.