Explain embryonic sac
Explain the embryonic sac? Specify the cells which form the embryonic sac? Specify their ploidies?
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The embryonic sac refers to the female gametophyte of the angiosperms. The embryonic sac generally composed of three cells which remain next to micropyle, two lateral synergids and the central oosphere (egg); the polar nuclei, one binucleated cell, is placed within the central region; three antipodal cells remain in the opposite side to micropyle. As all these cells come through the mitosis from the functional megaspore they are haploid (n).
Describe crystallization of a virus? What is the significance of this procedure?
State the problems that vertebrates are required to elucidate to adapt to terrestrial environment as they came from aquatic habitat? How these evolution does solve those problems?
How does synthetic theory of evolution incorporate knowledge from the Genetics and Molecular Biology in the darwinism?
Illustrate the difference between diffusion and osmosis?
Explain suction force of the plant cell? Does the suction force facilitate or make hard the entrance of water into the cell?
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Specify the nature of stimulus received and transmitted through the neurons?
Briefly describe the technique of gene conversion?
Explain the working of the contraceptive diaphragm? Specify the limitations of this contraceptive method?
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