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प्रश्न
What is polyembryony and how can it be commercially exploited?
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उत्तर
The occurrence of more than one embryo in a seed is called polyembryony.
- Embryos developed through polyembryony are found virus-free.
- The seedlings formed from nuclear tissue in citrus are found on better clones for orchards.
- Because nucellar adventive polyembryony produces genetically homogenous parental type seedlings, it is very important in horticulture.
- Plantlets derived from these embryos are free of illness. These embryos can be separated and cultured to make clones.
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संबंधित प्रश्न
State what is apomixis. Comment on its significance. How can it be commercially used?
Explain any three advantages that seeds offer to angiosperms.
Explain the different ways apomictic seeds can develop, Give an example of each.
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?
The ______ collect the pollen grains.
Fill in the blank:
The ________contains the egg or ovum.
Fill in the blank:
The ______ is the base of the flower to which other floral parts are attached.
Fill in the blanks:
The ______ are coloured to attract the insects that carry the pollen. Some flowers also produce ______ or ______ that attracts insects.
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 | ||
What is adventive polyembryony?
Give an account of polyembryony.
The occurrence of two or more embryos in one ovule is called ______
Adventive polyembryony in citrus is due to ______.
In case of polyembryony, if an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?
Give reason: Nucellar polyembryony is significant in horticulture.
