Question

Endosperm is formed during the double fertilization by

• A. two polar nuclei and one male gamete
• B. one polar nuclei and one male gamete
• C. ovum and male gamete
• D. two polar nuclei and two male gametes.

Answer 1

Answer: (A)

Double fertilization is the simultaneous occurrence of syngamy and triple fusion. Syngamy involves fusion of one male gamete with egg cell to form zygote. The result of syngamy is zygote (2n) which ultimately develops into embryo. The second male gamete fuses with 2 polar nuclei or secondary nucleus to form triploid primary endosperm nucleus and this is called triple fusion. This primary endosperm nucleus (3n) ultimately develops into a nutritive tissue for developing embryo called endosperm.