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प्रश्न
State what is apomixis. Write its significance. How can it be commercially used?
उत्तर
Apomixis is a form of asexual reproduction in which an embryo is formed without meiosis and fusion of haploid gametes. It can take place through diploid sporophytic cells of the ovule or from an unfertilized egg (parthenogenesis) itself.
Significance:
Certain species of plants belonging to Asteraceae, and grasses exclusively use the phenomenon of apomixis for producing seeds.
Commercial applications of apomixis:
1. By apomixis, hybrid varieties of seeds can be produced, which will provide higher and better yield.
2. Apomixis prevents the loss of specific characteristics in the hybrid plants.
3. Apomixis is a cost-effective method of producing seeds.
APPEARS IN
संबंधित प्रश्न
Explain the different ways apomictic seeds can develop, Give an example of each.
Define the Polyembryony.
Answer the following question.
When a seed of orange is squeezed, many embryos, instead of one are observed. Explain how it is possible.
How polyembryony can be commercially exploited?
Fill in the blank:
The pollen grains represent the ________.
Fill in the blank:
________takes place when one male gamete and the egg fuse together. The fertilized egg grows into a seed from which the new plants can grow.
Once the pollen reaches the stigma, the pollen tube traverses down the ________ to the ovary where fertilization occurs.
Fill in the blank:
The whorl ________is green that protects the flower until it opens.
Match the column.
| Column - I (Structure before seed formation) |
Column - II (Structure after seed formation) |
||
| A. | Funiculus | I. | Hilum |
| B. | Scar of ovule | II. | Tegmen |
| C. | Zygote | III. | Testa |
| D. | Inner integument | IV. | Stalk of seed |
| V. | Embryo | ||
Give an account of polyembryony.
