Write a brief account of fertilization in angiospermous plants. Explai

1.	Write a brief account of fertilization in angiospermous plants. Explain major events, basically the changes in ovule after fertilization.
Answer» Out of two male gametes released from the pollen tube, one fuses with the egg cell. This act is called fertilization. In angiosperms, this is necessarily followed by fusion of the second male gamete with the product of a fusion of two polar nuclei i.e. with the secondary nucleus. This is called triple fusion and thus both the male gametes participate in the act of fertilization. This is called double fertilization and is a unique feature of angiosperms. After a successful act of fertilization and double fertilization, each ovule is transformed into the seed. The parts of ovule undergo morphological changes as follows: Funicle – Stalk of seed Micropyle – Gets sealed ucellus – Degenerates in most cases. Integuments – Seed coat, (outer integument-Testa and inner integument Tegmen). Fertilized egg – Embryo Primary endosperm nucleus – Endosperm (Present in albuminous seeds and not in exalbuminous seeds). Antipodals and synergids – Degenerate.

Write a brief account of fertilization in angiospermous plants. Explain major events, basically the changes in ovule after fertilization.

Answer»

Out of two male gametes released from the pollen tube, one fuses with the egg cell. This act is called fertilization. In angiosperms, this is necessarily followed by fusion of the second male gamete with the product of a fusion of two polar nuclei i.e. with the secondary nucleus. This is called triple fusion and thus both the male gametes participate in the act of fertilization. This is called double fertilization and is a unique feature of angiosperms. After a successful act of fertilization and double fertilization, each ovule is transformed into the seed.

The parts of ovule undergo morphological changes as follows:

Funicle – Stalk of seed
Micropyle – Gets sealed
ucellus – Degenerates in most cases.
Integuments – Seed coat, (outer integument-Testa and inner integument Tegmen).
Fertilized egg – Embryo
Primary endosperm nucleus – Endosperm (Present in albuminous seeds and not in exalbuminous seeds).
Antipodals and synergids – Degenerate.

Write a brief account of fertilization in angiospermous plants. Explain major events, basically the changes in ovule after fertilization.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment