Question

On reaching the ovary, if pollen tube enters the ovule through integuments, then it is called ______.

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

Hint:

Remember: Porogamy–micropyle, Mesogamy–integuments, Chalazogamy–chalaza.

Answer 1

The Correct Option is B

Step 1: Understanding pollen tube entry.
Fertilization in angiosperms depends on the route through which the pollen tube enters the ovule. Different entry routes are named differently.
Step 2: Types of pollen tube entry.
Porogamy: Entry through the micropyle.
Chalazogamy: Entry through the chalaza.
Mesogamy: Entry through the integuments or lateral wall of the ovule.
Step 3: Analysis of options.
(A) Chalazogamy: Entry through chalaza.
(B) Mesogamy: Correct, entry through integuments.
(C) Porogamy: Entry through micropyle.
(D) Siphonogamy: Refers to fertilization through pollen tube, not entry route.
Step 4: Conclusion.
Entry of pollen tube through integuments is called mesogamy.