Question:
Consider the following statements
Assertion (A): In Monocystis, syngamy is isogamy.
Reason (R): It occurs due to fusion of dissimilar gametes.
Consider the following statements
Assertion (A): In Monocystis, syngamy is isogamy.
Reason (R): It occurs due to fusion of dissimilar gametes.
Show Hint
Isogamy = fusion of similar gametes; Anisogamy = fusion of dissimilar gametes; Oogamy = egg and sperm fusion.
Updated On: Jun 12, 2026
- Both (A) and (R) are correct, (R) is the correct explanation of (A)
- Both (A) and (R) are correct, (R) is not the correct explanation of (A)
- (A) is correct, but (R) is not correct
- (A) is not correct, but (R) is correct
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Syngamy refers to the fusion of gametes during sexual reproduction.
Based on the nature of gametes involved, syngamy may be:
• Isogamy (similar gametes fuse)
• Anisogamy (dissimilar gametes fuse)
• Oogamy (large non-motile egg and small motile sperm fuse)
Step 1: Analyze the assertion. In Monocystis, sexual reproduction occurs by fusion of morphologically similar gametes. Such fusion is termed isogamy. Therefore Assertion (A) is correct.
Step 2: Analyze the reason. The reason states that isogamy occurs due to fusion of dissimilar gametes. This is incorrect. Fusion of dissimilar gametes leads to anisogamy, not isogamy. Therefore Reason (R) is false.
Step 3: Final conclusion. Assertion is true but Reason is false. \[ \boxed{\text{(A) true, (R) false}} \] Hence option (C) is correct.
• Isogamy (similar gametes fuse)
• Anisogamy (dissimilar gametes fuse)
• Oogamy (large non-motile egg and small motile sperm fuse)
Step 1: Analyze the assertion. In Monocystis, sexual reproduction occurs by fusion of morphologically similar gametes. Such fusion is termed isogamy. Therefore Assertion (A) is correct.
Step 2: Analyze the reason. The reason states that isogamy occurs due to fusion of dissimilar gametes. This is incorrect. Fusion of dissimilar gametes leads to anisogamy, not isogamy. Therefore Reason (R) is false.
Step 3: Final conclusion. Assertion is true but Reason is false. \[ \boxed{\text{(A) true, (R) false}} \] Hence option (C) is correct.
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