Q. Which one of the following is a suitable reference to Xenogamy ?
Solution:
Dichogamy is the different maturation of male and female organs. In protandry, as in marigold, ripening of androecium earlier to gynoecium. In protogyny, as in Mirabilis, gynoecium matures earlier than androecium.
Geitonogamy is the transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant. Ecologically, this needs some agents, so it is a type of cross-pollination. But genetically, it is self-pollination.
Xenogamy is cross pollination in which transfer of pollen grains from the anther to the stigma of a genetically different plant of the same species, such type of plant has the advantage of variation.
Self incompatibility- Some pistils are incompatible with self-pollen. Thus, when self pollen lands on the stigma, it rejects the pollen and prevents the germination of the pollen tube. Thus, fertilization and self-pollination are prevented.
Geitonogamy is the transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant. Ecologically, this needs some agents, so it is a type of cross-pollination. But genetically, it is self-pollination.
Xenogamy is cross pollination in which transfer of pollen grains from the anther to the stigma of a genetically different plant of the same species, such type of plant has the advantage of variation.
Self incompatibility- Some pistils are incompatible with self-pollen. Thus, when self pollen lands on the stigma, it rejects the pollen and prevents the germination of the pollen tube. Thus, fertilization and self-pollination are prevented.