42.What do you understand by double fertilization ?
In angiosperms both the male gametes are functional. Double fertilization is a process in which egg nucleus and secondary nucleus are fertilized at one time by the male gametic nuclei. The fusion of one male gamete nucleus (1n) with egg or oosphere (1n) is called syngamy and result in the formation of oospore (2n). The second male gamete fuses with the two polar nucleii and is called triple fusion which results in formation of primary endosperm nucleus (3n). Since there are two fertilization events it is called 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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