Question

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is

• A. Geitonogamy
• B. Xenogamy
• C. Chasmogamy
• D. Cleistogamy

Answer 1

The correct option is B

Xenogamy

The correct option is B.

Explanation of the correct option:

1. In xenogamy, pollen grains are transferred from one plant's anthers to another plant's stigma, resulting in the stigma receiving pollen grains of genetically distinct types during pollination.
2. It is also referred to as cross-pollination.
3. This kind of pollination contributes to variation.
4. Onion, spinach, and grasses are examples of xenogamy.

Explanation of the incorrect option:

Option A:

1. Geitonogamy is the process by which two different blossoms on the same branch of the same plant pollinate one another.
2. Since, reproduction happens between genetically similar flowers produced on the same plant, it is also a form of self-pollination.
3. Corn is the most common example of geitonogamy.
4. Hence, it is an incorrect option.

Option C:

1. The cross-pollination process known as chasmogamy occurs when a flower's floral and reproductive sections are open and exposed to receive pollen grain from other sources; this flower is referred to as a chasmogamous flower.
2. At maturity, chasmogamous flowers open. Cross-pollination typically occurs in chasmogamous blooms (and sometimes self-pollinated).
3. Sunflower and viola are some examples of chasmogamous flowers.
4. Hence, it is an incorrect option.

Option D:

1. When floral parts and reproductive organs are surrounded, covered, closed, and do not open, this sort of autogamy self-pollination is known as cleistogamy, and the flower is called a cleistogamous flower.
2. Cleistogamous flowers do not open instead, they remain dormant and mostly self-pollinate.
3. Viola and Oxalis are some examples of cleistogamous flowers.
4. Hence, it is an incorrect option.

Final answer: The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is Xenogamy.