Types of Pollination: Xenogamy (Cross-Pollination)
Understanding xenogamy, the transfer of pollen grains from the anther to the stigma of a different plant.
What is Types of Pollination: Xenogamy (Cross-Pollination)?
The transfer of pollen grains from the anther of a flower to the stigma of a flower borne on a different plant of the same species.
Key points
- Define xenogamy and differentiate it from other pollination types.
- Explain the biological significance of xenogamy in terms of genetic variation.
- Identify the agents responsible for xenogamy.
- Recognize plant adaptations that favour xenogamy.
Common exam trap
Confusing xenogamy with geitonogamy (pollination between flowers on the same plant).
Definitions
- Term
Xenogamy
- Meaning
The transfer of pollen grains from the anther of a flower to the stigma of a flower borne on a different plant of the same species.
- Term
Cross-Pollination
- Meaning
A broader term that includes xenogamy and geitonogamy, referring to the transfer of pollen from one flower to another.
- Term
Genetic Variation
- Meaning
Differences in genetic makeup among individuals of a population, arising from processes like cross-pollination.
Learning objectives
Define xenogamy and differentiate it from other pollination types.
Explain the biological significance of xenogamy in terms of genetic variation.
Identify the agents responsible for xenogamy.
Recognize plant adaptations that favour xenogamy.
Prerequisites
Flower structure (anther, stigma)
Modes of pollination (wind, water, biotic agents)
Basic understanding of sexual reproduction in plants
Common mistakes
Confusing xenogamy with geitonogamy (pollination between flowers on the same plant).
Underestimating the role of pollinating agents.
Assuming cross-pollination always leads to superior offspring without considering genetic compatibility.
Keywords
Xenogamy
Cross-Pollination
Pollen Transfer
Genetic Diversity
Plant Reproduction
Pollinating Agents
Outbreeding
Sexual Reproduction
Practice preview
Which type of pollination involves the transfer of pollen from one flower to the stigma of another flower on a different plant, but of the same species?…
easy
In which of the following scenarios would xenogamy be MOST likely to occur, assuming the presence of appropriate pollinating agents?…
medium
A plant species exhibits the following characteristics: flowers are small, inconspicuous, lack nectar and scent, produce abundant, light, powdery pollen, and the stigma is feathery and exposed. These adaptations are prim…
hard