Question

Double fertilization or triple fusion are common in __________.

Answer 1

Double fertilization:

1. Double fertilization is an essential characteristic of flowering plants, that is, angiosperms.
2. In the process, two male gametes combine with one female gamete. The process of fertilization takes place by one male gamete with the egg leading to the development of a zygote, while the other unites with two polar nuclei resulting in the formation of an endosperm.
3. In angiosperms, the flowers form the reproductive parts with distinguished male and female reproductive organs.
4. The process of pollination assists the pollen grains to reach stigma through style. The two sperm cells enter the ovule-synergid cell, after that the process of fertilization takes place.
5. In flowering plants(angiosperm) fertilization results in the formation of two compositions, that is, zygote and endosperm. Thus, the name double fertilization is given.
6. It is a complex process in which out of the two sperm cells, one combines with the egg cell, and the other combines with the two polar nuclei resulting in the formation of a diploid zygote and a triploid primary endosperm nucleus.
7. As endosperm is an outcome of the fusion of three haploid nuclei, it is called triple fusion.

Final answer: Double fertilization or triple fusion are common in angiosperms.