Question

Transfer of pollen from anthers of one flower to the stigma of another flower of the same plant is called
A) Geitonogamy
B) Xenogamy
C) Dichogamy
D) Dicliny

Answer 1

It is a form of self-pollination that is often different from the fertilization that may result from it. In monoecious gymnosperms, it also occurs.

Complete answer:
First we should know about the pollination to answer this question. It is named pollination to move pollen grain from the anther to a stigma of a pistil. It is a process by which male and female non-motile gametes are mixed for fertilisation. Pollination is called self-pollination in which pollen grains from the anther unite with the same flower's stigma, or with the stigma of some other flower but of same plant.
Now, let us find the solution from the options-
- Geitonogamy is named the movement of pollen grains from an anther of a flower to the stigma of some other flower of the same plant. This transition requires a pollination agent. Genetically, because the pollen grains are from the same plant, it is close to autogamy.
- Xenogamy is the shift from the anther to the stigma of another plant of the pollen grains. This is the only form of cross-pollination. Thus, option B is not the correct option.
- Dichogamy is the development of male and female reproductive components by a hermaphroditic organism at various times to achieve cross-fertilization. Thus option C is not the correct option.
- The appearance of only one form of reproductive whorl in a flower is Dicliny. Unisexuality is therefore called Dicliny. A plant could be monoecious in dicliny, i.e. all male and female flowers are formed on the same plant or the plant could be dioecious, i.e. on separate plants are formed male and female flowers. Thus, option D is not the correct option.

Thus, the correct answer is option (A) Geitonogamy.

Note: By the wind, the pollen grains are distributed to the female, ovulate cone, which consists of several overlapping scales each covering two ovules, each of which comprises of a megasporangium covered in two layers of tissue, the cupule and the integument, formed from highly adapted branches of ancestral gymnosperms.