Go through the following statements:

  1. Flowers are bisexual and homogamous maturing anther and stigma of a flower at the same time.
  2. Mechanical devices bringing anthers and stigma close together in a bisexual chasmogamous flower.
  3. Cleistogamy (bisexual flowers remain closed)
  4. Anther and stigma of an intersexual flower mature in bud condition.

The above contrivances favour:

(a) Allogamy                   (b) Autogamy        (c) Xenogamy       (d) Cross pollination

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