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Solution


Q.

Double fertilisation is                                [2018]
1 fusion of two male gametes of a pollen tube with two different eggs  
2 fusion of one male gamete with two polar nuclei  
3 fusion of two male gametes with one egg  
4 syngamy and triple fusion  

Ans.

(4)

Double fertilisation is unique and universal feature of angiosperms. Total number of nuclei involved in double fertilisation is five, i.e., 2 in syngamy and 3 in triple fusion. Syngamy is fusion of one male gamete with egg to form zygote. Triple fusion occurs when the second male gamete fuses with 2 polar nuclei or secondary nucleus to form triploid primary endosperm nucleus.