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प्रश्न
Give an account of polyembryony.
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उत्तर
Polyembryony:
- Polyembryony is the occurrence of more than one embryo in a seed which consequently results in the emergence of multiple seedlings.
- The additional embryos result from the differentiation and development of various maternal and zygotic tissues associated with the ovule of the seed.
- In adventive polyembryony, an embryo develops directly from the diploid cell of nucellus and integuments as in Citrus.
- In cleavage polyembryony, zygote proembryo sometimes divides (cleaves) into many parts or units. Each unit then develops into an embryo.
APPEARS IN
संबंधित प्रश्न
Mention one advantage of apomictic seeds to farmers.
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 ________contains the egg or ovum.
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.
Fill in the blank:
The ______ is the base of the flower to which other floral parts are attached.
What is adventive polyembryony?
Adventive polyembryony in citrus is due to ______.
What is pollen grain?
Give reason: Nucellar polyembryony is significant in horticulture.
