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).
How the significance of brain evolved from fishes to the reptiles?
Define the term Technology which has changed the organization with example ?
Explain the formation of the female gametes of gymnosperms and also the relationship between this process and the concept of the alternation of generations?
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What are the cells generated in the first phase of the embryonic development termed?
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Whether ventricle lumen is larger during the systole or during the diastole?
Explain what is meant by the substrates of enzymatic reactions?
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