
The axial skeleton is to the appendicular skeleton as
a. a tree’s branches are to its trunk.
b. a car’s body is to its wheels.
c. a cell’s cytoplasm is to its nucleus.
d. a finger is to a toe.

Introduction:
Axial skeleton includes the bones supporting the head, ribs and the vertebral column. It is located along the central longitudinal axis of the body. Appendicular skeleton includes the bones in the limbs and legs.
Answer to Problem 1MCQ
Correct answer:
The axial skeleton with the appendicular skeleton can be compared to the car’s body with wheels. Therefore, option (b) is correct.
Explanation of Solution
Reason for the correct statement:
The appendicular skeleton bones are used for locomotion in the body and axial skeleton bones support the structural framework of the human body. In a similar way, the car’s body can be used for movement and locomotion by the wheels attached to the car.
Option (b) is given as “a car’s body is to its wheels”.
As, “the wheels can be used for moving the car in a similar way as the limbs in the appendicular skeleton can be used for the movement of the axial skeleton in the human body”, is the right answer.
Hence, option (b) is correct.
Reasons for the incorrect statements:
Option (a), is given as “a tree’s branches are to its trunk”.
Tree with its trunk cannot be moved as it is rooted at a place. Hence, it is a wrong answer.
Option (c), is given as “a cell’s cytoplasm is to its nucleus”.
The cytoplasm is the fluid present near the nucleus of the cell with streaming movements. Hence, it is a wrong answer.
Option (d), is given as “a finger is to a toe”.
The finger in a toe is attached to the leg which provides a base and support but not locomotion. Hence, it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
The wheels of a car are used locomotion as they are attached to the body of the car which is similar as compared to the limbs of the appendicular skeleton with structural support and framework provided by the axial skeleton.
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