A) entry of the pollen tube into the ovule through the micropyle in Ottetia
B) entry of the pollen tube into the ovule through chalaza in Casuarina
C) entry ofthe pollen tube into the ovule through the integuments
D) formation of many pollen tubes from a single pollen grain in Hibiscus
Correct Answer: B
Solution :
Trenb observed entry of pollen tube into the ovule through chalazal end in Casuarina. This is known as Chalazogamy. In general, entry of poallen tube into the ovule is of three types i.e., porogamy (through mycropyle), chalazogamy (through chalazal end) and misogamy (through integuments).
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