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 muscles.

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

(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called the 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:

Statement (i):

1. A sudden, involuntary response to stimuli is known as a reflex action.
2. A typical reflex action is pulling our hands away right away after touching something that is hot or cold.
3. It aids organisms in making a quick adjustment to a bad situation that could otherwise result in physical injury or even death.

Statement (iv):

1. A reflex is controlled by a neural pathway known as a reflex arc.
2. A reflex arc comprises a receptor, sensory neuron, control center, motor neuron, and effector.

Explanation of the incorrect options:

Statement (ii):

Sensory neuron carries the signal from the receptor to the central nervous system (spinal cord).

Statement (iii):

Motor neurons carry the signal from the spinal cord to the muscle.

Final answer: The correct statements are Statement (i) and (iii).