(a) What are the various steps of nitrate assimilation in plants ?
Give equations.
(b) What is the importance of excretion ? Name an ammoniotelic animal.
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(a) Nitrogen fixation (N2 to NH3/ NH4+ or NO3-) Nitrification (NH3 to NO3-) Assimilation (Incorporation of NH3 and NO3- into biological tissues) Ammonification (organic nitrogen compounds to NH3)
(b) Those animals which excrete their nitrogenous waste in the form of ammonia are known as ammonotelic. Ammonia is highly soluble in water with which it forms ammonium hydroxide (NH4OH) which can damage cells directly by its alkaline caustic action
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