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Sexual Reproduction in flowering Plants

Short Answer Type

41. What is pollination ? Name different types of pollination.

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42. What do you understand by double fertilization ?

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43. Give an account of significance of double fertilization.

Significance of double fertilization

(1) It results in the formation of diploid zygote which further develops into an embryo giving rise to a new plant.

(2) It leads to the formation of Primary endosperm nucleus which provides nutrition to the developing embryo.

(3) It restores the diploid condition.

(4) It results in combination of characters and hence variations in the offspring.

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Long Answer Type

44. What is bagging technique ? How is it useful in plant breeding programmes ?

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Short Answer Type

45. What is meant by emasculation ? When and why does a plant breeder employ this technique ?

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46. Compare the structure of a non-endospermic (non-albuminous) seed with an endospermic (albuminous) dicot seed.

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Long Answer Type

47. Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events ? Name the structures formed at the end of these two events.

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Short Answer Type

48. Arrange the following terms in a correct development sequence :
Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gamete.

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49. What do you mean by monosporic development of female gametophyte ?

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50. With a neat diagram explain the 7-celled, Eight nucleate mature female gametophyte.

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