A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
S.G. Nawaschin was the first to show that both the sperms released by a pollen tube are involved in fertilization. They fertilize two different elements of the embryo sac. The phenomenon is unique to angiosperms and is called double fertilization. The nucleus of one of the sperms fuses with the egg nucleus and that of the other migrates to the central cell where it fuses with the polar or their fusion product, the secondary nucleus. Most of the plants have two polar nuclei. Consequently, the second fertilization involves the fusion of three nuclei. This phenomenon is called triple fusion.
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