Important Questions with solution
Q1: What is joint?
Ans: We are able to bend or rotate our body in place where two parts of our body seem to be joined together these places are called joints.
Q2: Name that joint which allows movement in all directions.
Ans: Ball and socket joint.
Q3: Write an example of hinge joint.
Ans: knee joint.
Q4: What is fixed joint?
Ans: Some joints in our head, the bone can’t move such a joint are called fixed joint.
Q5: What is skeleton?
Ans: The bones in our body also form a framework to give a shape to our body. This framework is called skeleton.
Q6: What is rib cage?
Ans: Ribs join the chest bone and the backbone together to form a box . This is called the rib cage.
Q7: What is cartilage?
Ans: Soft bone which can be bent is called cartilage. Ex – ear and sternum.
Q8: What is a ball and socket joit?
Ans: The rounded end of one bone fits into cavity of the other bone. Such a joint allows movements in all directions.
Q9: Which of the skull bones are movable?
Ans: Lower jaw.
Q10: Why can our elbow not move backwards?
Ans: Elbow cannot move backwards because it has hinge joint which allows only back and forth movements.
Q11: What is streamlined?
Ans: The head and tail of the fish are smaller than the middle portion of the body tapers at both ends. This body shape is called streamlined.
Q12: How do snails move?
Ans: Snails move with the help of a muscular foot.
Q13: How do earthworms move?
Ans: Earthworms move by alternate extension and contraction of the body using muscles.
Q14: How do bones move?
Ans: The bones are moved by alternate contractions and relaxations of two sets of muscles.
Q15: Why do fishes have fins on their body?
Ans: Fishes have fins on their body which mainly help to keep the balance of the body and to keep direction, while swimming.