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What is polyembryony and how can it be c...

What is polyembryony and how can it be commercially exploited?

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Polyembryony is the occurrence of more than one embryo in a see. In many citrus and mango varieties, some of the nucellar cells surrounding the embryo sac start dividing protrude into the embryo sac and develop into embryos. In such species, each ovula contains many embryos.
Polyembryony plays a main role in plant breeding and horticulture . The plantlets obtained from these embryos are virus free and has more vigour.Hybrid varieties of several food and vegetable crops are being extensively cultivated and these hybrid cultivars possess high productiviy
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NCERT EXEMPLAR-SEXUAL REPRODUCTION IN FIOWERING PIANTS-Sexual Reproduction In Fiowering Piants
  1. Which is the triploid tissue in a fertilised ovule? How is the triploi...

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  2. Are pollination and fertilisation necessary in apomixis? Give reasons.

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  3. Identify the type of carpel with the help of diagrams given below

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  4. How is pollination carried out in water plants?

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  5. What is the function of the two male gametes produced by each pollen g...

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  6. List three strategies that a bisexual chasmogamous flower can evolve t...

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  7. Given below are the events that are observed in an artificial hybridis...

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  8. Vivipary automatically limits the number of offsprings in a litter. Ho...

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  9. Does self-incompatibility impose any restrictions on autogamy? Give re...

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  10. In the given diagram, write the names of parts shown with lines.

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  11. What is polyembryony and how can it be commercially exploited?

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  12. Are parthenocarpy and apomixis different phenomena ? Discuss their ben...

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  13. Why does the zygote begin to divide only after the division of primary...

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  14. The generative cell of a two celled pollen divides in the pollen tube,...

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  15. In the figure given below label the following parts-male gametes, egg ...

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  16. Starting with the zygote, draw the diagrams of the different stages of...

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  17. What are the possible types of pollinators in chasmogamous flowers. Gi...

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  18. With a neat, labelled diagram, describe the parts of a mature angiospe...

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  19. Draw the diagram of a microsporangium and lable its wall layers.Write ...

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  20. Can an unfertilised, apomictic embryo sac give rise to diploid embryo ...

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