Question

Simultaneous fusion of one of the male gametes with the egg and the other with the secondary nucleus.

Answer 1

Answer:

it is called double fertilization, this process takes place in angiosperm during sexual reproduction

Explanation:

there are two male gametes the first male gamete fuses with the egg cell in the ovule and forms a diploid zygote where as the second male gamete fuses with the polar nuclei and form a triploid cell called endosperm nucleus (triple fusion) thus it can be seen that there are two fusions happening

Answer 2

Simultaneous fusion of one of the male gametes with the egg and the other with the secondary nucleus is called Double fertilisation.

What is double fertilisation?

• When pollen grains fall on stigma after pollination, they create a pollen tube that goes all the way through style to reach the ovary.
• The most effective pollen tube reaches the ovule's embryo sac and unites with it. Two pollen grains are discharged into the embryo sac from the pollen tube.
• One fertilises the egg to form a zygote, and the other fertilises with two polar nuclei to form a secondary nucleus.
• The fertilised ovary can form fruit and seed after double fertilisation. The seed forms endosperm, which nurtures the growing embryo, as a result of double fertilisation.

Thus, it's the process of double fertilization which plays a significant role in the evolution of flowering plants.