Class 6 Science Chapter 5 Question Answers - Body Movement

Short Answer Type Questions

Q1: Why are we not able to move our upper jaw?

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

Q2: What is a hinge joint?

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

Q3: What is rib cage?

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

Q4: How can earthworm move?

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

Q5: Why birds can fly?

Ans: 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.

Q6: What kind of body fishes has, which helps them to swim?

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

Q7: How does earthworm gets grip on ground?

Ans: 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.

Q8: Why snake move fast but not in straight line?

Ans: 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.

Q9: What is the difference between bones and cartilage?

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

Q10: How is earthworm useful for plants?

Ans: 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.

Q11: Which of these animals have bones in their body: 

Earthworm, snake, snail, fish, bird

Ans: Snake, fish, bird.

Q12: Which of the following are true:

1. Cartilage is not as hard as bone.

2. Bones move from every joint.

3. Knee has hinge joint

4. The body of fish is streamlined.

Ans: 1, 3, 4 are true.

Q13: How are bones of bird modified to move wings up and down?

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

Q14: Which muscles in cockroach helps the cockroach in walking?

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

Q15: What type of substance is secreted by earthworm?

Ans: Its body secrete a slimy substance to help in movement.

Q16: Match the following:

 
Ans: 

Short Answer Type Questions

Q1: How muscles work in movement of bones?

Ans: When contracted muscles become shorter, stiffer and thicker. It pulls the bones. To move the bone in opposite direction, the relaxed muscle contracts to pull the bone towards it original position, while the first relaxes. Thus muscles work in pair to move the bone.

Q2: How fish swims?

Ans: The body of fish is streamlined. The skeleton of fish is covered with strong muscles. During swimming the muscles make the front part of body to one side and tail swings towards opposite side. Then quickly the body and tail are curved to other side. This makes a jerk and pushes body forward.