Answer the following questions:
1. Why can our elbow not move backwards?
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2. Explain various kinds of joints found in our body and give example of
each.
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3. Which is the longest bone in our body?
Ans: Femur is the longest bone in our body. It is a thigh bone.
4. What helps the fish to move through water with low resistance?
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5. Sam went to science laboratory to see the specimen of cockroach and
bird wings. He observed many differences in them though both are used
for flying. He reported his observation to science teacher. His teacher
praised him.
(a) Can you list the differences between wings of cockroach and bird?
(b) How birds are adapted for flying?
(c) How many legs are present in cockroach?
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6. Statement - Two muscles are needed to move a bone. True or False.
7. How does earthworm gets grip on ground?
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8. What is the function of skeleton?
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9. Draw a labeled diagram of cockroach and label the parts.
10. Differentiate between exoskeleton and endoskeleton.
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Answer:
(c) Our elbow cannot move backwards because it has a hinge joint which allows the movement in one plane only.
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Answer:
1. Because it has a hinge joint which allows the movement in one plane only
2. A joint is the part of the body where two or more bones meet to allow movement. Generally speaking, the greater the range of movement, the higher the risk of injury because the strength of the joint is reduced. The six types of freely movable joint include ball and socket, saddle, hinge, condyloid, pivot and gliding.
3. Femur is the longest bone in our body. It is a thigh bone.
4. Fish stretch or expand their muscles on one side of their body, while relaxing the muscles on the other side.
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