What is Pollination?
- Pollination refers to the transfer of pollen from the anther (the male part) of a flower to the stigma (the female part) of the same or another flower.
- This process enables fertilisation and the production of seeds.
- Without pollination, many plants would not be able to reproduce.
Types of Pollination
- Self-pollination: pollen grains from the anther fall directly onto the stigma of the same flower.
- Advantages:
- Ensures that recessive characters are eliminated.
- Wastage of pollen grains is minimal.
- Maintains the purity of the genetic race.
- No reliance on external factors (like wind or other agents).
- Reduced genetic diversity due to lack of gene mixing.
- Reduced vigour and vitality in offspring.
- Lower immunity to diseases.
- Cross-pollination occurs when pollen is transferred from the anther of one flower to the stigma of another flower (of the same species).
- Types of Cross-Pollination:
- Anemophily: Pollination by wind (common in grasses and some trees).
- Zoophily: Pollination by animals, including insects (like bees, butterflies, and beetles), birds, and bats.
- Anthropophily: Pollination by humans (rare but can happen unintentionally).
- Increases genetic diversity.
- Enhances vigour and adaptability.
- Promotes disease resistance.
- Open pollination: includes both self-pollination and cross-pollination.
- Occurs when pollen is transferred naturally, without human intervention.
- Open-pollinated plants contribute to biodiversity and adaptability.
Agents of Pollination
- Animals: Insects (bees, butterflies, beetles), birds, bats, and even some mammals.
- Wind: Wind-pollinated plants release lightweight pollen grains that are carried by air currents.
- Water: Aquatic plants rely on water for pollination.
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