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).
Define the term osmotic pressure?
Define the term Ensembl in Genome databases?
Give a brief explanation of double immuno diffusion method.
With no saturation of transport proteins and beneath the similar concentration gradient how can the speed of simple diffusion are compared to the speed of facilitated diffusion?
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What takes place when auxin concentration in some structures of plant is over the action range of hormone?
After the phase of digestion is over next step includes the absorption which is done by cells of mucous membrane of intestine. For this task a large absorption surface can be taken as an advantage. How it is possible in small internal space of body of the pluric
Write down the climax stage of ecological succession?
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