Question
Write differences between self-pollination and cross-pollination.
✓
Answer
Differences between self-pollination and cross-pollination :
| S.No. | Self-pollination Cross-pollination | Self-pollination Cross-pollination |
| 1 | It involves transfer of pollen grains from anther to stigma of same flower or other flower of same plant. | It involves transfer of pollen grains from anther of a flower to stigma of another flower of different plants. |
| 2 | Flowers are odourless, nectarless, colourless and | Flowers are usually brightly coloured, nectarous, odorous and large in size. |
| 3 | Flowers are bisexual. | Flowers are usually unisexual |
| 4 | Pollen grains are not wasted. | Pollen grains are wasted enormously. |
| 5 | Male and female sex organs grow and mature simultaneously at the same time | Male and female sex organs in bisexual flower grow and mature at different time. |
| 6 | This process does not require any agency | It requires the agency like wind, water, insects, bats etc. |
| 7 | It is of two types i.e. autogamy and geitonogamy | It is also of two types i.e. Allogamy and xenogamy. |
| 8 | Puriety of gametes is maintained through self-pollination therefore chances of variation and evolution are very less. | Cross-pollination introduces variation and therefore it causes evolution. |
| 9 | Seeds so obtained are weak and unhealthy. | Seeds so obtained are viable and healthy. |
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