Double fertilization

Correct answer: B. To form two male gametes

Explanation: The governing concept is male gametophyte development and double fertilisation. The generative cell undergoes one mitotic division and produces two haploid male gametes. One later fuses with the egg to form the zygote, and the other fuses with the polar nuclei or central cell to form the primary endosperm nucleus. The vegetative cell forms the pollen tube.

Correct answer: A. One male gamete fuses with the egg cell, and the other fuses with the secondary nucleus.

Explanation: Double fertilization is the defining reproductive feature of angiosperms and consists of two fusion events. One male gamete fuses with the egg to form a diploid zygote, called syngamy. The second fuses with the secondary nucleus, producing the primary endosperm nucleus through triple fusion. The other options describe no normal double-fertilisation event.