Question:
Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?
Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?
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Xenogamy = X-tra (Different) plant. It is the only one that truly achieves "Cross-Pollination" in a genetic sense!
Updated On: May 3, 2026
- Cleistogamy
- Autogamy
- Geitonogamy
- Xenogamy
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The Correct Option is D
Solution and Explanation
Pollination can be classified based on the source of the pollen grains. The genetic makeup of the offspring depends entirely on whether the pollen comes from the same flower, the same plant, or a different plant:
• Xenogamy (4): This involves the transfer of pollen grains from the anther to the stigma of a different plant. This is the only type of pollination which, during pollination, brings genetically different types of pollen grains to the stigma.
• Geitonogamy (3): This is the transfer of pollen from the anther to the stigma of another flower on the same plant. Functionally, it is cross-pollination (requires a vector), but genetically it is similar to autogamy because the pollen comes from the same parent.
• Autogamy (2): This is the transfer of pollen grains within the same flower. It results in genetic uniformity.
• Cleistogamy (1): This occurs in flowers that never open. In such flowers, autogamy is mandatory, and there is no chance of cross-pollination, meaning the offspring are genetically identical to the parent.
• Xenogamy (4): This involves the transfer of pollen grains from the anther to the stigma of a different plant. This is the only type of pollination which, during pollination, brings genetically different types of pollen grains to the stigma.
• Geitonogamy (3): This is the transfer of pollen from the anther to the stigma of another flower on the same plant. Functionally, it is cross-pollination (requires a vector), but genetically it is similar to autogamy because the pollen comes from the same parent.
• Autogamy (2): This is the transfer of pollen grains within the same flower. It results in genetic uniformity.
• Cleistogamy (1): This occurs in flowers that never open. In such flowers, autogamy is mandatory, and there is no chance of cross-pollination, meaning the offspring are genetically identical to the parent.
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