Question

Which one is a gametophytic polyembryony?
A)Endosperm polyembryony
B)Adventive polyembryony
C)Antipodal polyembryony
D)Nucellar polyembryony

Answer 1

Hint: Polyembryony is a phenomenon by which two or more embryos are developed from a single fertilised egg. Polyembryony occurs in the humans in which the siblings are genetically identical. This leads to identical twins.

Complete answer:
To solve this question, we must know about the gametophytic polyembryony.

Polyembryony occurs in many species of vertebrates, invertebrates and plants. It gives birth to identical twins.
Polyembryony in plants is of two types.

Gametophytic polyembryony – In this type of polyembryony, the embryo forms from the gametic cells of the embryo sac. This can take place with or without fertilisation. For example embryos formed from antipodal cells.

Sporophytic polyembryony- The embryo that arises from zygote or from other sporophytic cells like ovules. For example embryos developed from nucellus or integument.

Endosperm polyembryony is an example of true polyembryony in which two or more embryos are developed from endosperm that lies inside the embryo sac.

Adventive polyembryony- In this type of the embryo is formed due to sporophytic budding which eventually develops into a mature embryo.

Hence, the correct answer is option (C)

Note: Nucellar polyembryony is a mode of seed reproduction that occurs in citrus plants. The cleavage polyembryony occurs in gymnosperms. It occurs due to the cleavage of growing embryos. The polyembryony can also be of induced type. In this the development of an embryo is made in a culture medium.