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Question

(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.

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Solution

a) There are two ways by which apomictic seeds can be produced:
  • Agamospermy: In this method, seeds are produced from diploid cells without meiosis and fertilization e.g., apple.
  • Adventive embryony: In this method, nucellus and integuments extend into the embryo sac and develops an embryo. In this method, the formation of more than one embryo takes place and this condition is called as polyembryony e.g., citrus fruit.
b) The main advantage of apomictic seeds to farmers is that, this method is of low cost and gives high yield production.
c) Mature stage of dicotyledonous embryo:



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