Double fertilisation is an exclusive feature found in flowering plants. Based on the course of the growth of the pollen tube and entry into the ovule, which one of the following is known as mesogamy?

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Entry of pollen tube through the micropyle into the ovule

Entry of pollen tube through the placenta and the funiculus

Entry of pollen tube through the integuments

Entry of pollen tube through the funiculus and chalaza into the embryo sac from the egg apparatus end

answer is C.

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Detailed Solution

Concept: Double fertilisation is an exclusive feature found in flowering plants. In mesogamy, the dust tube enters through the integuments of the ovule. It is seen in Cucurbita plants.
Entry of the dust tube through the micropyle into the ovule is porogamy. Entry of the dust tube through the funiculus and chalaza into the developing life sac from the egg device conclusion is chalazogamy.
Therefore, based on the course of the growth of the pollen tube and entry into the ovule, the Entry of the pollen tube through the integuments is known as mesogamy.
Hence, the correct answer is option 3.

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