In double fertilization, the second male gamete fuses with the two polar nuclei to form the:

1. The pollen tube releases two male gametes into the embryo sac. 2. One male gamete fuses with the egg cell to form the zygote. 3. So the zygote is the other fusion product, ruling out option A here. 4. The second male gamete fuses with the two polar nuclei to form the endosperm. 5. The embryo sac is the structure that holds the egg and polar nuclei, not a product, so C is ruled out. 6. The pollen tube only delivers the gametes, so D is ruled out; two male nuclei fusing makes it double fertilization. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 3 "Life Processes in Living Organisms Part 2", p.36_