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Question
Describe different agents of cross-pollination.
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Solution
- Cross-pollination involves the transfer of pollen grains from the anther to the stigma of another plant of the same species.
- Thus, an external agency is required in this type of pollination.
Some of the common agents of cross-pollination include:
- Pollination by insects (Entomophily) - entomophilous flowers are flowers that are pollinated by insects. These flowers are usually large, brightly coloured, and sweet smelling. For example, flowers like dahlia, rose, and bougainvillea.
- Pollination by water (Hydrophily) - Hydrophilous flowers are flowers that are pollinated by water. These flowers produce pollen grains of specific gravity and are produced in large numbers. These flowers are found in aquatic plants. For example, Vallisneria and Hydrilla.
- Pollination by wind (Anemophily) - Anemophilous flowers are flowers that are pollinated by wind. These flowers are small, dull-coloured, nectarless, and odourless. For example, flowers in maize and wheat.
- Pollination by birds (Ornithophily) - Ornithophilous flowers are usually funnel-shaped and produce nectar. For example, flowers like hibiscus and Bignonia.
- Apart from this cross-pollination can also be affected by elephants (elephophily) and artificially by humans (artificial pollination).
- Cross-pollination involves the transfer of pollen grains from the anther to the stigma of another plant of the same species.
- Thus, an external agency is required in this type of pollination.
- Pollination by insects (Entomophily) - entomophilous flowers are flowers that are pollinated by insects. These flowers are usually large, brightly coloured, and sweet smelling. For example, flowers like dahlia, rose, and bougainvillea.
- Pollination by water (Hydrophily) - Hydrophilous flowers are flowers that are pollinated by water. These flowers produce pollen grains of specific gravity and are produced in large numbers. These flowers are found in aquatic plants. For example, Vallisneria and Hydrilla.
- Pollination by wind (Anemophily) - Anemophilous flowers are flowers that are pollinated by wind. These flowers are small, dull-coloured, nectarless, and odourless. For example, flowers in maize and wheat.
- Pollination by birds (Ornithophily) - Ornithophilous flowers are usually funnel-shaped and produce nectar. For example, flowers like hibiscus and Bignonia.
- Apart from this cross-pollination can also be affected by elephants (elephophily) and artificially by humans (artificial pollination).
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