Question

If the integuments are pierced by the pollen tube during fertilization.

It is reffered as ..................

• A. Porogamy
• B. Mesogamy
• C. Chalazogamy
• D. Siphonogamy

Answer 1

The correct option is B Mesogamy

In mesogamy, pollen tube enters the ovule through the integuments or funiculus. After the pollen tube enters the embryo sac, its apex dissolves and the male gametes are liberated. One of the male gametes are liberated. One of the male gametes fuses with the egg and produces a diploid zygote which by further division develops into an embryo. The other male gamete fuses with the diploid secondary nucleus and produces a triploid primary endosperm nucleus. This is called double fertilization.