Question

Which of the following statements are true?

i) Sudden action in response to something in the environment is called reflex action.

ii) Sensory neurons carry signals from the spinal cord to the muscles.

iii) Motor neurons carry signals from receptors to spinal cord.

iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.

• A. i and ii
• B. i and iii
• C. i and iv
• D. i, ii and iii

Answer 1

The correct option is C

i and iv

The correct option is C.

Explanation of the correct option:

1. Automatic response to the action of a stimulus is called reflex action.
2. The order of correct sequence of reflex action includes: receptor----sensory neuron----spinal cord----motor neuron----muscle.
3. Sudden action in response to something in the environment is called reflex action.
4. The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.
5. Sensory neurons carry signals from the receptors to the spinal cord.
6. Motor neurons carry signals from the spinal cord to muscles.

Explanation of the incorrect option:

Option A:

(i) is true and (ii) is false

Option B:

(i) is true and (iii) is false

Option D:

(i) is true while, (ii) and (iii) are false.

Final answer: The true statements from the following are (i) and (iv).