Sexual Reproduction in Flowering Plants Question 82
82. Double fertilisation leading to initiation of endosperm in Angiosperms require
[2000]
(a) fusion of one polar nucleus and the second male gamete only
(b) fusion of two polar nuclei and the second male gamete
(c) fusion of four or more polar nuclei and the second male gamete only
(d) all the above kinds of fusion in different angiosperms
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Answer : b
Hints & Solutions
(b) The second male gamete entering the ovary fuses with two haploid polar nuclei to form triploid primary endosperm nucleus which develops into endosperm. This fusion of two male gametes with two different structures (egg and secondary nucleus) in the same female gametophyte is called double fertilization.
