Short Answer TypeState what is apomixis. Comment on its significance. How can it be commercially used?
Long Answer Type(a) Explain the different ways apomictic seeds can develop. Give an example of each.
(b) Mention one advantage of apomictic seeds to farmers.
(c) Draw a labelled mature stage of a dicotyledonous embryo.Short Answer Type|
Perisperm |
Endosperm |
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Perisperm is the remnant of nucellus which are persistent. It encloses the embryo and provides nourishment to it in certain seeds. |
Endosperm is the tissue formed after double fertilisation. It surrounds, stores food and provide nourishment to the embryo in an angiosperm seed. |
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It is diploid in nature. |
It is triploid in nature because it is formed as a result of triple fusion. |
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Example- Black pepper |
Example- Wheat |
Out of many papaya plants growing in your garden, only a few bear fruits. Give reason.
Long Answer Type(a) Explain the post-pollination events leading to seed production in angiosperms.
(b) List the different types of pollination depending upon the source of pollen grains.
Short Answer TypeA. Draw a labelled diagram of L.S. of an embryo of grass (any six labels).
B, Give reason for each of the following:
(i) Anthers of angiosperm flowers are described as dithecous.
(ii) Hybrid seeds have to be produced year after year.
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