Page 4 - Assignment-Sexual Reproduction in flowering plantsFormat - Copy (2)

16. Name the blank spaces a, b, c and d is the table given below :
Item What it represents in the plant

17. Even though each pollen grain has two male gametes. Why are at least 10 pollen grains
andnot 5 pollen grains required to fertilise 10 ovules present in a particular carpel?

D. Short Answer Questions-I (3 marks each)

18. Continued self pollination lead to inbreeding depression. List three devices, which
flowering planthave developed to discourage self pollination?
19. What will be the fate of following structures in the angiospermic plant? Ovary wall,
Ovule, zygote,outer integument Inner integument and primary endosperm nucleus.
20. Differentiate between micro sporogenesis and mega sporogenesis. What type of cell
divisionoccurs during these events. Name the structure formed at the end of these two
events.

E. Long Answer Questions (5 marks each)

21. Draw the Embryo sac of a flowering plants and label :
(a) (i) Central Cell
(ii) Chalazal end
(iii) Synergids
(b) Name the cell that develops into embryo sac and explain how this cell leads to
formationof embryo sac.
(c) Mention the role played by various cells of embryo sac.
(d) Give the role of filiform apparatus.