what are the three contrivances in flowers which favour cross pollination with examples?
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Two contrivances of cross-pollination are-
Dichogamy- different times of maturation of male and female reproductive organs of a plant. It occurs in sunflower, jasmine, etc.
Heterostyly- Different lengths of stamens and pistils which does not allow self-fertilisation. It occurs in primula, oxalis, llinum, etc.
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