Question

Assertion :The ploidy of endosperm in angiosperms is 3n or triploid. Reason: One male gamete and one female gamete along with a vegetative cell are involved in the formation of endosperm.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is C Assertion is correct but Reason is incorrect.

• Triple fusion is the fusion of the male gamete with two polar nuclei inside the embryo sac of the angiosperm.
• When pollen grains fall on the stigma, the pollen tube enters and releases two male gametes.
  
• Out of the two male gametes, one gamete fuses with the nucleus of the egg cell and forms the zygote (syngamy).
  
• The other male gamete fuses with the two polar nuclei present in the central cell to form a triploid primary endosperm nucleus. Since this process involves the fusion of three haploid nuclei, it is known as triple fusion. It results in the formation of the endosperm.
  
• One male gamete nucleus and two polar nuclei are involved in this process.
  
• So, the correct answer is 'Assertion is correct but Reason is incorrect'.