Question

The phenomenon of embryo formation from a vegetative cell derived from zygote is known as
(A) Apospory
(B) Diploid polyembryony
(C) Adventive polyembryony
(D) Apomixis

Answer 1

Polyembryony- The phenomenon of formation of two or more than two embryos from a single fertilized egg is termed as Polyembryony. In this case, as the embryos are formed from the same egg, the embryos are found to be alike with each other however they differ genetically from their parents. In human beings, the process of Polyembryony could be well-observed in the form of formation of twins, which have identical characters.

Complete answer:
The process of formation of gametophytes from the sporophytic cells deprived of the development of spores is called Apospory. The origination of a gametophytic cell straight from any of the vegetative parts of a mature or an immature sporophyte is also termed as Apospory.

Diploid polyembryony- The polyembryony will be diploid and the embryo that is developed from the nucellus is haploid.

Adventive Polyembryony is a kind of Apomixis, where the embryo is usually formed owing to sporophytic budding. In case of adventive Polyembryony, the zygote forms from the sporophytic cells of a plant and any of the sporophyte cells undergoes the various phases of embryogeny, finally to form a well-developed embryo.

The process asexual reproduction in which the feasible embryo is produced inside the boundaries of the seed coat, devoid of undergoing meiosis and syngamy, is called as Apomixis.

Thus, the correct answer is option ‘C’.

Note: The process of production of seeds in certain plant species including various types of citrus plants is called nucellar embryony. Moreover, nucellar embryo and a zygotic embryo could arise simultaneously in the same seeds, and further the zygotic embryo could undergo division to develop multiple embryos.