Question

The development of sporophyte without fertilization from the vegetative cells of the gametophyte is called as
A) Zygospory
B) Aplanospory
C) Apospory
D) Apogamy

Answer 1

Hint:The fertilization in plants is the process of fusion of the male gamete which is formed by pollen grain with the female gamete, the ovum or the egg.

Complete answer:
When more than one embryo is found in the seed, such a condition is called polyembryony. These vegetative cells are diploid sporophytic cells. Another feature of polyembryony is there are no cell division processes such as mitosis and meiosis. The embryos produced in polyembryony are identical to each other but genetically different from the parents. Apogamy reproduction occurs in some ferns, in which the sporophyte develops from the gametophyte but does not fuse with gametes.

 Additional information:
>In apospory diploid gametophytes are produced from the non-reproductive vegetative cells of sporophytes.
>While on the other hand the apogamy is formation of haploid sporophytes without the gametes and the vegetative cells of the gametophyte.
>Zygospore is the reproductive cycle of many fungi.
>Aplanospory production of asexual spore within the cell.

Hence the correct answer is option ‘D’.

Note:Aplanospore are nonmotile, and formed within the cells. They have different wall than that of the parent cells. Zygospores are created by the nuclear fusion of haploid cells. Apospory is the development of 2n gametophytes, without meiosis and spores, from vegetative, or nonreproductive, cells of the sporophyte.