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.a. Different ways by which we can develop apomictic seeds include-
1. Formation of diploid egg i.e embryo without undergoing reduction division or fertilization e.gAsteraceae
2. Some nuclear cell divides surrounding the embryo sac divide continuously surrounding before protrude into embryo sac ultimately develop into embryo e.g Mango
b. Advantage of apomitic seeds for farmers include reduce cost of seed purchase, They can keep the hybrid seeds once purchases for next season.
(c)
Short Answer TypeOut 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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