Class 10 Science Chapter 6 Practice Question Answers - Control and Coordination

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Question 1: 
Assertion (A) : The spinal nerves are 31 in number.
Reason (R) : Spinal nerves only have sensory neurons in them
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (c)
A is true but R is false.

Question 2: 
Assertion (A) : The brain is also known as the central nervous system.
Reason (R) : Central nervous system controls and regulates the voluntary actions.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (d)
A is false but R is true.

Question 3: 
Assertion (A) : A nerve impulse is an electrochemical event.
Reason (R) : In a nerve impulse there are changes in the resting potential which spreads down the nerve fibre.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (a)
Both A and R are true and R is the correct explanation of A.

Question 4: 
Assertion (A) : Cyton region of nerve fibre collects information for the brain.
Reason (R) : Reason (R) : Nerve fibres can either have or lack myelin sheath.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (d)
A is false but R is true.

Question 5: 
Assertion (A) : A receptor is a specialized group of cells in a sense organ that perceive a particular type of stimulus.
Reason (R) : Different sense organs have different receptors for detecting stimuli.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (b)
Both A and R are true but R is not the correct explanation of A.

Question 6: 
Assertion (A) : The effect of auxin hormone on the growth of root is exactly opposite to that on a stem.
Reason (R) : Auxin hormone increases the rate of growth in root and decreases the rate of growth in stem.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (c)

A is true but R is false.

Question 7: 
Assertion (A) : Animals can react to stimuli in different ways.
Reason (R) : All animals have a nervous system and an endocrine system involving hormones.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (a)
Both A and R are true and R is the correct explanation of A.

Question 8: 
Assertion (A) : Insulin regulates blood sugar level.
Reason (R) : Insufficient secretion of insulin will cause diabetes.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Correct Answer is Option (a)
Both A and R are true and R is the correct explanation of A.