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प्रश्न
Answer the following question.
Explain any two ways by which apomictic seed can develop.
उत्तर
The two ways in which apomictic seeds can develop are:-
- Recurrent Apomixis: An embryo sac develops from the megaspore mother cell with disturbed meiosis due to which the egg-cell is diploid. The embryo subsequently develops directly from the diploid egg-cell without fertilization.
- Adventive Polyembryony: Embryos arise from a cell or a group of cells either in the nucellus or in the integuments, e.g. in oranges and roses. Since it takes place outside the embryo sac, it is not grouped with recurrent apomixis. The embryo within the embryo sac may also develop simultaneously, thus giving rise to polyembryony condition, as in Citrus, Opuntia.
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संबंधित प्रश्न
Differentiate between perisperm and pericarp.
Parthenocarpy and apomixis have been observed in some plants. Give an example of each.
State a similarity and a difference observed between Parthenocarpy and apomixis.
The development of fruits without fertilisation of the ovary is called ______.
The number of meiotic divisions, required to produce 400 seeds in a pea plant, is ______.
Which of the following floral parts forms the pericarp after fertilisation?
Number of meiotic divisions required to produce 200/400 seeds of pea would be ______.
Seeds are regarded as products of sexual reproduction because they ______.
Endosperm, a product of double fertilization in angiosperms is absent in the seeds of ______.
Leaves of dicotyledonous plants possess ______ venation, while ______ venation is the characteristic of most monocotyledons.
