Question

Double fertilization means

• A. fusion of nucleus of male gamete with the egg nucleus
• B. fusion of two polar nuclei
• C. fusion of sperm nucleus with secondary nucleus
• D. fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus

Answer 1

Answer: (D)

fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus

Answer 2

Double fertilization was first observed by Nawaschin (1892) in Lilium and Fritillaria and confermed by Grignard. It is characteristic of angiosperms. In double fertilization first fertilization is normal and second, as it involves three nuclei is known as triple fusion.