Question

The process whereby a perfect flower is pollinated by its own pollen is
a) Allogamy
b) Autogamy
c) Xenogamy
d) Hydrogamy

Answer 1

Hint: Pollination is a process that takes place prior to fertilization in plants. It is very important for successful fertilization as it involves mating of male and female gametes.

Complete answer:
Basically, pollination is a process in which pollen grains (the male gametes) from the anthers are transferred to the ovary (female reproductive part having eggs) through stigma. This pollination process requires some agent for transfer of these pollen grains. As there are many possible patterns of arrangement of reproductive parts amongst these flowers, therefore, different methods are adopted by plants to conduct their pollination process.
Allogamy is a method of pollination in which the pollination takes place between two different flowers typically on separate plants. As androecium and gynoecium are present on different flowers therefore self-pollination cannot take place. Thus, option A is an incorrect option.
Autogamy is a process of fertilization in which flowers get pollinated by their own pollen grains that are androecium and gynoecium are present on the same flower. As the perfect flower is pollinated by its own, thus it is the correct option.
Xenogamy is the process of fertilization in which pollination takes place between two separate flowers of genetically different plants. As this pollination is taking place between two different flowers so is an incorrect option.
Hydro-gamy is a method of pollination in which water works as a pollinating agent. Such a n approach is common to aquatic plants only. As it is concerned with the agent of pollination and with the arrangement of reproductive parts on flowers so is ultimately an incorrect option.

So the correct answer is option b) Autogamy.

Note:
In unisexual flowers, male or female reproductive parts are either present on different flowers of the same plant or on different plants of the same species. Such flowers are called incomplete flowers Whereas, there are also some bisexual plants also that have both the reproductive parts on same flower also called complete flowers.