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

Answer 1

The Correct Option is B

The question asks about the specific term used for the transfer of pollen grains from the anthers of one plant to the stigma of a different plant, which results in genetically different pollen grains being introduced to the stigma.

The correct option here is Xenogamy. Let's examine why this is the appropriate choice and rule out the other options:

• Cleistogamy: This is a type of pollination where fertilization occurs within closed flowers. There is no opening of flowers, and it typically results in self-pollination, not introducing genetically different pollen.
• Xenogamy: This is the term for cross-pollination between different plants, bringing genetically diverse pollen grains to the stigma. It ensures genetic variability and is the answer to the question.
• Geitonogamy: This refers to the transfer of pollen grains from the anther of one flower to the stigma of another flower on the same plant. It is a form of self-pollination since it occurs within the same plant.
• Chasmogamy: This involves flowers that open to expose the reproductive organs, allowing for cross-pollination or self-pollination depending on other factors, but it focuses more on the flower type rather than the type of pollen transfer discussed in the question.

Conclusion: The process asked in the question, which involves the transfer of genetically different pollen grains to another plant's stigma, is best described by Xenogamy.