What is meant by pollination? Name and differentiate between the two modes of pollination in flowering plants.
The transfer of pollen grains from anther of a stamen to the stigma of carpel is called pollination. Pollination is done by insects, birds, wind and water.
Pollination can occur in two ways:
Self pollination | Cross pollination. |
1.When the pollen grains from the anther of a flower are transferred to the stigma of the same flower or another flower on the same plant it is called self pollination. | 1.When the pollen grains from the anther of a flower on one plant are transferred to the stigma of a flower on another similar plant it is called cross pollination. |
2. Self pollination can occur even in closed flower. | 2. Cross pollination occurs when the flowers are open. |
3. External agents are not required for this. | 3. An external agent is required for carrying the pollens. |
4. Highly useful characters are preserved by this. | 4. Unable to preserve all the highly useful characters since they get diluted. |
5. Adaptability to environment is less. | 5. Plants are better adaptable to changed environment. |
6. It does not help in producing new races, varieties and species. | 6. It gives rise to offsprings having variations among themselves. |
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