Class Notes NCERT Solutions for CBSE Students
Question: Give two examples of ball and socket joint.
Answer:
- Joint of upper arm and shoulder.
- Joint of thigh and the hip.
Question: Give an example of pivotal joint.
Answer: The joint of skull with backbone.
Question: Give two examples of hinge joints.
Answer:
- Joints in fingers
- Joints in knee
Question: Give an example of fixed joint.
Answer: Joint of cranium skull.
Question: Give an example of gliding joint.
Answer: The joint in backbone.
Question: What is skeleton?
Answer: The framework of bones in our body is called skeleton.
Question: What are ribs?
Answer: The bones of the chest are called ribs.
Question: What is rib cage?
Answer: Ribs are joined with backbone to form a box. This box is called rib cage.
Question: What are shoulder bones?
Answer: The shoulder bones are formed by the collar bone and the shoulder blade. It connects the
upper part of the chest and bones of the arm.
Question: What are pelvic bones?
Answer: The bones which enclose the body part below the stomach are called pelvic bones.
Question: What are cartilages?
Answer: Some additional parts of the skeleton which are not as hard as bones and are elastic in nature and can be bent are called cartilages, e.g. cartilage of ear.
Question: Name the three components of skeleton.
Answer: Skeleton is made up of many bones, joints and cartilage.
Question: Name the parts of the body which help in movement.
Answer: Contraction and relaxation of muscles and bones and joints help in movement.
Question: Name two animals which move without bones.
Answer:
- Earthworm
- Snail
Question: Give an example of animal which can walk, climb and fly in the air.
Answer: Cockroaches.
Question: Name the organ in cockroach which helps in walking.
Answer: The three pairs of legs in cockroach help in walking.
Question: Which part of the cockroach help in flying?
Answer: There are two pairs of wings attached to the breast which help them in flying.
Question: Name a bird which can swim in water.
Answer: Duck.
Question: What do you mean by streamlined?
Answer: If the body tapers at both the ends then such, shape of the body is said to be streamlined.
Question: How does the snake move?
Answer: Snakes have a long backbone and many thin muscles which help in the movement. The snake’s body curves into many loops. Each loop of the snake gives it a forward push by pressing against the ground.
Question: What do you mean by fractured bone?
Answer: Fractured bone means broken bone.
Question: Why are fractured bones plastered?
Answer: Plaster keeps broken bones at their right place so that they grow and join properly.
Question: Name organs that are protected by the rib cage?
Answer: Heart and Lungs.
