Discussion
In Cucurbitaceae, during fertilization entry of the pollen tube occurs through integuments. This type of fertilization is referred as :
Answer: B
Entry of the pollen tube through the integuments is mesogamy.
The route of the pollen tube into the ovule is classified into three types. In porogamy, the common type, it enters through the micropyle. In chalazogamy, first described in Casuarina, it enters through the chalaza. In mesogamy it enters through the middle of the ovule, through the integuments (as in Cucurbita) or the funicle (as in Pistacia).
Isogamy is not a route of pollen tube entry at all. It is the fusion of gametes that look alike, as in some algae.
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