Development of Seed

Find one word for the The following statements and choose the correct option. (i) Residual, persistent nucellus in seed -A (ii) Microspores arranged in a cluster of four cells - B (iii) Special cellular thickening at the micropylar end of emrbyo sac - C (iv) Development of seeds without fertilization - D

Which of these is the correct sequence of steps to develop a new plant variety? P - Evaluation Q - Multiplication of improved seeds R - Selection S - Distribution of improved seeds T - Development of gene variation

The process of development of more than one embryo in seeds of citrus fruits is called

(a) A capsicum flower has 240 ovules in its ovary . But , it produces a fruit with only 180 viable seeds. Explain giving a reason that could be responsible for such a result. (b) Describe the development of an endosperm in a viable seed. Why does endosperm development precedes embryo development ? (c) Give an example of an angiosperm seed that has a perisperm . Name the part the perisperm develops from.

a) Why does endosperm development precede development in angiosperm seeds? State the role of endosperm in mature albuminous seeds. b) Describe with the help of three labelled diagrams the different embryonic stages that include mature embryo of dicot plants.