Assertion (A): Radius and ulna are the two long bones of the lower arm.

Reason (R): Tibia and fibula are the two long bones of the shank.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

Name any two parts of your body where the supporting skeleton is made of cartilage instead of bone.

Given below is the structure of the forelimb of humans. Read the information below the diagram and fill in the blanks:

Limbs are a part of the appendicular skeleton system. Humans have one pair of forelimbs which are used for many purposes like - holding, writing, eating and grasping, etc. Each arm consists of a total of thirty bones.

The upper arm consists of a single long bone, called (a) …………… . Two long bones are found in the lower arm, (b) …………… found on the side of the thumb and (c) …………… . Forelimbs have eight (d) …………… in the wrist and five (e) …………… in the palm. Remaining fourteen bones are found in the fingers as phalanges.

Assertion (A): Hinge joint occurs between the bones of wrist. It provides movement in only one direction.

Reason (R): Hinge joint is found in shoulders. It provides movement in all directions.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.