Module: | Pre-fertilization: Micro/Megasporogenesis
Q9: Consider the following statements regarding the types of pollination in flowering plants:
1. Geitonogamy is functionally cross-pollination involving a pollinating agent, but genetically it is similar to autogamy.
2. Xenogamy is the only type of pollination that brings genetically different types of pollen grains to the stigma.
3. Autogamy requires the stigma and anther to mature at completely different times to ensure successful self-pollination.
Which of the above statements is/are correct?
2. Xenogamy is the only type of pollination that brings genetically different types of pollen grains to the stigma.
3. Autogamy requires the stigma and anther to mature at completely different times to ensure successful self-pollination.
Which of the above statements is/are correct?
✅ Correct Answer: A
The correct option is A. Statements 1 and 2 are correct, while Statement 3 is incorrect.
Pollination is defined as the transfer of pollen grains from the anther to the stigma of a pistil.
Structurally and ecologically, it is divided into three types: Autogamy, Geitonogamy, and Xenogamy.
Geitonogamy involves the transfer of pollen to the stigma of another flower on the same plant; thus, functionally it requires an agent, but genetically it produces offspring identical to the parent, just like autogamy.
Xenogamy involves pollen transfer to a different plant entirely, causally introducing genetic variation.
Statement 3 is incorrect because autogamy (self-pollination within the same flower) strictly requires synchrony in pollen release and stigma receptivity, not different maturation times.
Historically, distinguishing the genetic versus functional aspects of geitonogamy is a highly recurring trap in medical entrance examinations.
Pollination is defined as the transfer of pollen grains from the anther to the stigma of a pistil.
Structurally and ecologically, it is divided into three types: Autogamy, Geitonogamy, and Xenogamy.
Geitonogamy involves the transfer of pollen to the stigma of another flower on the same plant; thus, functionally it requires an agent, but genetically it produces offspring identical to the parent, just like autogamy.
Xenogamy involves pollen transfer to a different plant entirely, causally introducing genetic variation.
Statement 3 is incorrect because autogamy (self-pollination within the same flower) strictly requires synchrony in pollen release and stigma receptivity, not different maturation times.
Historically, distinguishing the genetic versus functional aspects of geitonogamy is a highly recurring trap in medical entrance examinations.