Question

Assertion (A): Reflex actions do not involve thinking.
Reason (R): Most reflex actions are controlled by the spinal cord.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Reflex arc pathway: Stimulus \(\Rightarrow\) Receptor \(\Rightarrow\) Sensory neuron \(\Rightarrow\) Spinal cord (interneuron) \(\Rightarrow\) Motor neuron \(\Rightarrow\) Effector \(\Rightarrow\) Response.
Brain is not involved, so no thinking required!

Answer 1

The Correct Option is A

To determine the correct answer, we need to evaluate both the assertion and the reason provided, and see if the reason adequately explains the assertion.

Assertion (A): Reflex actions do not involve thinking.

Reason (R): Most reflex actions are controlled by the spinal cord.

Let's break down each statement:

1. Understanding Reflex Actions:
   • Reflex actions are involuntary and automatic responses to stimuli.
   • They occur without the involvement of the conscious part of the brain.
   • This lack of direct conscious involvement is why reflex actions do not involve "thinking" in the usual sense.
2. Role of the Spinal Cord:
   • The spinal cord is primarily responsible for the control of many reflex actions.
   • When a reflex action is triggered, the sensory neurons send a signal to the spinal cord, which then sends an immediate response signal back to the muscles, bypassing the brain.
   • Thus, the spinal cord facilitates quick reactions without waiting for brain processing, which supports the assertion that these actions do not involve thinking.
3. Analyzing the Relationship:
   • Since reflex actions are controlled by the spinal cord, which operates independently of conscious brain functions, this is why they do not involve thinking.
   • Therefore, the reason given explains the assertion correctly.

Conclusion: Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

Final Answer: Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).