Describe outbreeding devices which encourage cross pollination?
Question: Describe outbreeding devices which encourage cross pollination?
Outbreeding devices are mechanisms or features that prevent self-pollination and promote cross-pollination in plants. Cross-pollination leads to genetic variation and avoids inbreeding depression, which can result from repeated self-pollination. Some examples of outbreeding devices are:
- Unisexuality: The plant has either male or female flowers, so self-pollination is not possible.
- Dichogamy: The anther and stigma of the same flower mature at different times, so they cannot pollinate each other.
- Herkogamy: There is a physical barrier that prevents the pollen of the same flower from reaching the stigma.
- Self-sterility: The pollen of the same flower does not germinate on the stigma due to genetic incompatibility.
- Heterostyly: The anther and stigma of the same flower are at different heights, so they cannot contact each other.
- Pollen prepotency: The pollen of another flower germinates faster than the pollen of the same flower on the stigma.
These outbreeding devices ensure that only compatible pollen from different flowers can fertilize the ovules, resulting in cross-pollination .
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