Question

Assertion (A) : Endosperm in angiosperm is a triploid tissue.
Reason (R) : Endosperm is formed after triple fusion i.e. fusion, of a diploid secondary nucleus with a haploid male gamete.

• 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:

The diploid secondary nucleus plus one haploid male gamete gives a triploid primary endosperm nucleus.

Answer 1

The Correct Option is A

Step 1: Check the Assertion:
The endosperm develops from the primary endosperm nucleus (PEN). It has three sets of chromosomes, so it is triploid. So (A) is true.

Step 2: Check the Reason:
The central cell has two polar nuclei, which fuse to form the diploid secondary nucleus. One haploid male gamete fuses with it. This is triple fusion. So (R) is true.

Step 3: Link:
Diploid (2n) plus haploid (n) gives triploid (3n). So R explains A directly.

Step 4: Select the code:
Both are true and R explains A. So option (A).

Final Answer:
The correct option is (A).