write a brief note on double fertilization in angiosperms
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Answer:
Angiosperms are plants that produce flowers and fruits, and they are the most common types of plants on Earth. Flowers are the reproductive structures of angiosperms. They include four basic parts:
Carpel: Female reproductive structure that makes eggs.
Stamen: Male reproductive structure that makes sperm cells.
Petals: Surround the carpel and stamen and are often brightly colored.
Sepals: Surround the flower petals before it has opened.
During flowering plant reproduction, two structures are created: a zygote and the endosperm. A zygote will grow and develop into an embryo, or baby plant. The endosperm is the plant embryo's food source. This process of forming a zygote and endosperm is called double fertilization, and it is unique to angiosperms.
Answer:
Double fertilization- The process of fusion of male gamete with the female gamete to form the diploid zygote (2n) is known as fertilisation. The fusion of one male gamete with egg and that of another male gamete with a secondary nucleus is called double fertilisation. It is the characteristic feature of only angiosperms. All angiosperms are characterised by a unique process called double fertilisation. Double fertilisation is significant because it involves the use of both the male gametes produced by a pollen grain. This avoids the chances of polyembryony and increases the chances of survival of the future plant. It consists of two fusions and results in the formation of two products. First fertilisation restores diploidy in the life cycle. The diploid zygote develops into an embryo which subsequently develops into a new plant. Second fertilisation product, triploid PEN (Primary endosperm nucleus) develops to form a nutritive tissue called endosperm for developing an embryo.
Angiosperms are seed-bearing vascular plants. Their reproductive structures are flowers in which the ovules are enclosed in an ovary.
Explanation:
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