A) porogamy
B) chalazogamy
C) mesogamy
D) apogamy
Correct Answer: A
Solution :
The pollen tube may enter the ovule by following one of three routes given below: (a) Porogamy: Pollen tube enters the ovule through micropyle, e.g., most angiosperms. (b) Mesogamy: Pollen tube enters the ovule through integuments (e.g., Cucurbita) or through funiculus (e.g., Pistacia). (c) Chalazogamy: Pollen tube enters the ovule through chalazal tissues, e.g., Casuarina, Beta vulgaris, Juglens regia, etc.
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