Triple fusion is the result of
(a) fusion of three haploid nuclei
(b) fusion of two polar nuclei with male gamete
(c) fusion of secondary nuclei with male gamete

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a only

a and b only

a, b and c

b and c only

answer is D.

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Detailed Solution

One of the male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN). As this involves the fusion of three haploid nuclei it is termed triple fusion.

It is observed that just before fusion the two polar nuclei fuse to form the diploid secondary nucleus. So during triple fusion the male gamete can also be said to fuse with the secondary nucleus.

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