How does endosperm in angiosperm become ...

How does endosperm in angiosperm become triploid?

Answer

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The endosperm in angiosperms develops from

Zygote

Secondary nucleus

Chalazal polar nucleus

Micropylar polar nucleus

Assertion: Endosperm of angiosperms is generally triploid (3n). Reason: It develops from primary endosperm nucleus formed by the fusion of haploid male gamete and diploid secondary nucleus.

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.

If Assertion is true but the Reason is false.

If both Assertion and Reason are false.

Double fertilisation (or triple fusion) leading to initiation of endosperm in angiosperms, requires

Fusion of 4 or more polar nuclei and the second male gamete only

Fusion of 2 polar nuclei and second male gamete only

Fusion of one polar nucleus and second male gamete only

All these types of fusion in different types of angiosperms