57.Describe the megaspore development in an angiospermic plant.
The Ovules generally have one megaspore mother cell at the micropylar end . The megaspore mother cell has dense cytoplasm and a prominent nucleus. It undergoes meiosis twice to form a linear tetrad of four haploid cells. Out of these foure cells one cell functions as the megaspore while the other three cells degenerate. Functional megaspore gives rise to female gametophyte.
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58.Tabulate the differences between self-pollination and cross-pollination.
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59.Give the characters of wind pollinated flowers
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60.What are zoophily, zoophilous flowers and entomophilous flowers ? List the characters of entomophilous flowers
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