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Question1: Both, autogamy and geitonogamy are prevented in [CBSE PMT’2012 S]
(a) Papaya
(b) Cucumber
(c) Castor
(d) Maize
Answer: a
Solution:
Papaya is dioecious i.e. male and female flowers occurs in separate plants so that it prevents both autogamy and geitonogamy (method of self pollination).
Question2: Wind pollination is common in [CBSE PMT’2011]
(a) Legumes
(b) Lilies
(c) Grasses
(d) Orchids
Answer: c
Wind pollination is common in grasses. Grasses produce large amount of pollen which reach to opposite sex for reproduction by the help of wind.
Question3: In which one of the following pollination is autogamous? [CBSE PMT’2011]
(a) Geitonogamy
(b) Xenogamy
(c) Chasmogamy
(d) Cleistogamy
Answer: d
Cleistogamy is autogamous pollination. When pollination and fertilization occur in unopened flower bud, it is known as cleistogamy. It ensures self-pollination and prevents cross-pollination.