Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?

Question

Accepted Answer

B. 1. **Autogamy** is self-pollination within the same flower, so the pollen genetically matches the plant it lands on — no new genetic variation is introduced.

2. **Cleistogamous** flowers never even open, forcing autogamy, which again means no genetically different pollen is involved.

3. **Geitonogamy** is the transfer of pollen from one flower to another flower on the **same plant**; since both flowers belong to the same plant, the pollen is still genetically identical to the recipient.

4. **Xenogamy** is the transfer of pollen from the anther of one plant to the stigma of a **genetically different plant** of the same species, so it is the only type that actually brings in genetically different pollen.

5. Hence, the answer is **Option B: Xenogamy**.