Question

In angiosperms, when the pollen tube enters the ovule through micropyle, it is called ______.

• A. siphonogamy
• B. porogamy
• C. chalazogamy
• D. mesogamy

Hint:

The Latin word for the pore, porus, helps to recall the term.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
After germination of pollen on the stigma, the pollen tube may enter the ovule by different routes.

Step 2: Routes
Through the micropyle: porogamy (commonest, for example lily).
Through the chalaza: chalazogamy (for example Casuarina).
Through the integuments or funicle: mesogamy (for example Cucurbita).

Step 3: Siphonogamy
Siphonogamy is the general term for carrying male gametes to the egg through a pollen tube.

Final Answer:
Entry of the pollen tube through the micropyle is called porogamy. \[ \boxed{\text{(B) }\text{porogamy}} \]