Chapter 8: Body Movement

Ans: The movement of the human body is possible because of the two main parts of our body which are the bones and the muscles. The bones are joined through each other from end to end and give the body a solid and strong foundation while the contractions in our muscles help us to move our organs in any direction of our will.

Hence, the correct option is (a).

Ans: The upper jaw and the skull are the immovable joints in the human body and they do not show any movement.

Hence, the correct answer is option (c).

Ans:  Here, dogs and human beings have both muscles and skeleton while a snail has a hard shell which is a form of an exoskeleton and an earthworm lacks skeletons but uses two types of muscles for movement.

Hence, none of these are correct.

Ans: The underwater i.e. sea divers use the fin-like flippers on their feet when going underwater in order to make their body to get efficient which helps them to reduce the haul of water acting on their body. This process helps them to move easily and quickly in deep water like the other aquatic animals.

Hence, the correct answer is option (a).

Ans: A snail uses its muscular foot for movement since it does not have a bone in the lower part of its body. However, they have a hard shell made up of an exoskeleton.

Hence, the correct answer is option (c).

Ans: A body uses two of its muscles to move a single bone since a muscle can only pull a bone but cannot push it back. Hence, another muscle is needed in order to maintain the movement of a bone.

Therefore, the correct answer is option (b).