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Double fertilization is

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. Syngamy and triple fusion
4. Fusion of two male gametes with one egg

Correct answer: Syngamy and triple fusion

Solution

In flowering plants, double fertilization includes two fusions in the same embryo sac: syngamy (one male gamete with the egg) and triple fusion (the other male gamete with the two polar nuclei). These two events occur together, so that is the correct definition.

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