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The water expulsion vesicle (also known as a contractile vesicle) is an important osmoregulatory organelle in freshwater protists, which are hyperosmotic to surrounding water. Water constantly diffuses into cell and could cause the cell to burst if there wasn't some way to get it out. That is what water expulsion vesicle does. A network of collecting tubules extends throughout cells, and rich supply of mitochondria on the surface of tubules provides energy required to pump water from cytoplasm into the tubules. Tubules dump the water they've collected into water expulsion vesicle, which slowly fills. Once full, vesicle's membrane fuses with the outer plasma membrane creating a pore out of which excess water flows.
Class of Crustacea - Branchiopoda These are small fresh water crustaceans. The trunk appendages are flattened and leaf like and are helpful for locomotion also respiration he
(a) What is the distinction among 'breathing' and 'respiration'? (b) What part do 'ventilation' and 'gaseous exchange' play in these processes? (a) Breathing i
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Structure of Hemicellulose When compared with cellulose, it has lower degree of polymerization, more readily soluble in acid and alkali and non-fibrous. On hydrolysis, it predo
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Define senescence Explain the 'programmed senescence theory' of ageing.
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Plot the data as a suitable graph. Join the points with the best-fitting smooth curve.Temperature oC(5,10,11,13,17,19) Time taken for eggs to hatch/h 230 90 70 30 25
what features are in a epithelial cell
How the artificial sweeteners are available as sugar substitute? Some of these are available as tablets, as sugar substitute and others appear as ingredients in many food produ
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