describe contrivances for cross pollination
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It is highly wasteful because plants have to produce a larger number of pollen grains and other accessory structures in order to suit the various pollinating agencies.
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The contrivances in flowers are-
1. The property of self-fertilization.
2. Unisexuality.
3. Dichogamy- The differing maturation timings of gynoecium and androecium.
4. The various structural barriers.
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