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1. Self-pollination is a transfer of pollen grains from anther to stigma of same or different flower on the same plant.
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1. Cross-pollination is a transfer of pollen grains from anther of one plant to the stigma of flower of the other plant.
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2. Agents for pollination are normally not required.
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2. It requires agents for pollination.
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3. Plants need not to produce large number of pollen grains.
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3. Plants need to produce large number of pollen grains.
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4. Flowers are normally small and non-attractive.
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4. Flowers are large and attractive like brightly coloured, nectar, smell, etc.
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5. Purity of plants is maintained.
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5. Purity of plants is not always maintained.
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6. Less chances for production of variety in species.
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6. Due to inter-mixing, variety in species are observed.
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7. More chances of pollination
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7. Less chances of pollination
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8. Self pollinating plants are monoecious.
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8. Most of the cross pollinating plants are dioecious.
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