Question

Xenogamy is
A) Pollination between two flowers of two different plants
B) Pollination between the different flowers of the same plants and the same branches.
C) Pollination between anther and stigma of the same flower
D) A mechanism of parthenocarpy.

Answer 1

Hint:Pollination is the process of transfer of pollen grains from the anther of the stamen to the receptive stigma of the carpel of the same or genetically different flowers of the same species.

Complete answer:
Pollination is of two types- Self-pollination and cross-pollination. Self-pollination involves the transfer of pollen grains from the anthers of a flower to the stigma of the same flower. Self-pollination is of two types:
1. Autonomy
2. Geitonogamy
Option A: Xenogamy is the cross-pollination between the flowers of different plants. In xenogamy, pollen grains are transferred from the anther of a flower of one plant to the stigma of a different flower. Thus, the pollination occurs between two flowers of two different plants. Therefore, this is the correct option.

Option B: Pollination between the different flowers of the same plants and the same branches. It is a type of self-pollination in which the pollen from anthers of one flower is transferred to the stigma of another flower of the same plant. Such type of pollination is called geitonogamy. Therefore, this is an incorrect option.

Option C: Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower. The pollination between anther and stigma of the same flower is called autogamy. Such type of pollination is called self-pollination. Therefore, this is an incorrect option.

Option D: Parthenocarpy is the process in which fertilization of ovules is induced naturally or artificially, which makes the fruit seedless. Stenospermocarpy may also produce apparently seedless fruit, but the seeds are actually aborted while they are still small. Therefore, this is an incorrect option.

Hence the correct answer is option ‘A’.

Note:It is to be noted that xenogamy brings genetically different types of pollen grains to the stigma. Geitonogamy is the pollination between two different flowers of the same plant and pollination between anther and stigma of the same flower is known as Autogamy and these two types of pollination belong to self-pollination.