A) embryo
B) embryo sac
C) endosperm
D) gamete
Correct Answer: C
Solution :
The phenomenon of double fertilization was given by S G Nawaschin (1898), to show that both the sperms released by a pollen tube are involved in fertilization. The first male nucleus fuses with the egg cell to form the zygote and the second male nucleus fuses with two polar nuclei to form a triploid nucleus that develops into the endosperm. Embryo is the structure in plants that develops from the zygote prior to germination. In seed plants, the zygote is situated in the embryo sac of the ovule. Embryo sac is a large structure that develops in the ovules of flowering plants. It is equivalent to the female gametophyte of lower plants. Typically, it contains 8 nuclei formed by division of the functional megaspore. There is a large central cell with 2 polar nuclei, which fuses to form the secondary nucleus. Gamete is a reproductive cell that fuses with another gamete to form a zygote. Gametes are haploid, thus, when two fuse, the diploid number is restored.
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