Which one of the following character causes cross pollination

Options :
  1. Cleistogamy
  2. Dichogamy
  3. Homogamy
  4. All the above
Answer and Explanation :-

Answer: Option 2

Explanation:

When maturation period of male and female gametes is different, then cross pollination is compulsory, it is known as Dichogamy.

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He hesitated, remembering something Finnikin had said to him on their journey. That somehow, even in the worst of times, the tiniest fragments of good survive. It was the grip in which one held those fragments that counted.
-Melina Marchetta Finnikin of the Rock