Question

Assertion (A): Fusion of two mature protozoans (which act as gamets) is known as hologamy. Reason (R): Temporary union of two senile ciliates for the exchange of nuclear material is called amphimixis.

• A. Both (A) and (R) are true. (R) is the correct explanation for (A)
• B. Both (A) and (R) are true. (R) is not the correct explanation for (A)
• C. (A) is true. But (R) is false
• D. (A) is false. But (R) is true

Hint:

Hologamy = Fusion of mature cells; Conjugation = Exchange of genetic material (like in Paramecium).

Answer 1

The Correct Option is C

Step 1: Read both statements.
The Assertion describes hologamy, and the Reason describes a process it calls amphimixis. We must judge each one separately.

Step 2: Check the Assertion about hologamy.
In some protozoa, two full-grown adult individuals fuse together, and the whole bodies act as gametes. This is called hologamy. So the Assertion is true.

Step 3: Look at the Reason carefully.
The Reason talks about two old ciliates joining for a short time only to swap nuclear material, then separating again.

Step 4: Name that process correctly.
This temporary union to exchange nuclei is called conjugation, not amphimixis. Amphimixis is a different idea, meaning the union of two different sex cells. So the Reason is false.

Step 5: Combine the judgements.
The Assertion is true, but the Reason is false.

Step 6: Pick the option.
The choice that says the Assertion is true but the Reason is false is the third one.
\[ \boxed{\text{(A) is true. But (R) is false}} \]