(a) Draw a diagram of a fully developed embryo sac of an angiosperm. Label its chalazal end and any other five parts within the embryo sac.

(b) Why does the development of an endosperm precede that of the embryo in angiosperm ?

(c) Number of chromosomes in an onion plant cell is 16. Name the cells of the embryo sac having 16 and 24 chromosomes formed after fertilisation.

 

 
 
 
 
 

Answers (1)

a)

antipodals side is called chalazal end.

b) Because the cells get packed with reserve food supplies, used for providing the nutrition to the developing embryo.

c) Cells with 16 chromosomes is called zygote and cells with 24 chromosome is called endosperm

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