Question

In Casuarina, fertilization takes place through

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

Answer 1

The correct option is C Chalazogamy

• Mesogamy is the entry of pollen tube in the ovule through the integuments (e.g. Cucurbita) or through funiculus (e.g. Pistacia).

• Porogamy is the entry of pollen tube in the ovule through the micropyle. It occurs in most of the angiosperms.

• Chalazogamy is the entry of pollen tube in the ovule through the chalazal tissues. Example, Casuarina.

• Apogamy is a type of reproduction in which sporophyte develops directly from the gametophyte without the fusion of gametes.

Hence, in Casuarina fertilization takes place through Chalaza, as pollen tube enters the ovule from Chalaza to release the male gametes which will fuse with the egg cell and central cell, resulting in fertilization.

So, the correct answer is C.