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Byju's Answer
Standard XII
Biology
Development of Endosperm
Assertion :Th...
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.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

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'.

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