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12th Biology 2013 Set2 Delhi Board Paper Solution

Question 14

(a) How does cleistogamy ensure autogamy?
(b) State one advantage and one disadvantage of cleistogamy to the plant.

Answer
(a)
Cleistogamy ensures autogamy as cleistogamous flowers do not open at all and hence there is no chance of cross pollination as there is no chance of cross-pollen landing on the stigma.
 
(b)
 
Advantage
• Clestogamous flowers produce assured seed set even is absence of pollinators.
 
Disadvantage
• No variation is there in the progeny.