What is pollination ? Name different types of pollination. from B

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


Pollination. It is the transfer of pollen grains from the anther to stigma.

Pollination is of two types :

1. Self-pollination. It is also called autogamy. The pollen grains are transferred from the anther to  the stigma of the same flower. e.g hibiscus.

2. Cross-pollination. It is also called allogamy. If the transfer of pollen takes place from anther to stigma of a different flower of same plant, it is known as Geitonogamy. e.g  Maize.
On the other hand, if cthe transfer occurs from anther to stigma of a different flower of different plant, it is called the Xenogamy. e.g papaya.

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