The correct answer is Option (1) → Geitonogamy
- Geitonogamy: Geitonogamy involves the transfer of pollen grains from the anther to the stigma of another flower of the same plant. While functionally it is a form of cross-pollination since it involves a pollinating agent, genetically it is similar to autogamy because the pollen grains come from the same plant. Geitonogamy does not introduce genetically different pollen to the stigma.
- Xenogamy: Transfer of pollen grains from 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.
- Cleistogamy refers to a reproductive strategy in plants where self-pollination occurs within closed flowers that do not open. One advantage of this mechanism is that it eliminates the need for external pollinators such as insects or wind for successful pollination and fertilization. The flowers are capable of self-fertilization within their closed structure, allowing plants to reproduce even in the absence of pollinating agents.
- Dichogamy: The ripening of the stamens and pistils of a flower at different times, so that self-fertilization is prevented.
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