A) Self sterility
B) Dichogamy
C) Heterogamy
D) None of these
Correct Answer: D
Solution :
Allogamy is also known as cross fertilization i.e., involvement of male and female gametes of two different flowers. Self sterility i.e., ability of a bisexual flower to form viable off springs. Self fertilization, is necessary for allogamy. Dichogamy, a condition when male and female flowers mature at different times, is necessary for allogamy. Protandry, when male flowers mature first and protogyny, when female flowers mature first are two conditions of dichogamy. Heterogamy, a condition when two types of gametes are formed. It is also necessary for allogamy.
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