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Write a note on symbiotic nitrogen fixation.


Symbiotic nitrogen fixing bacteria : These bacteria are found associated with roots of higher plant e.g. Rhizobium leguminosarum is found in nodules of roots of leguminous plants. Frankia is found in the roots of Alnus. These bacteria fix atmospheric nitrogen and make it available to the plant. 

 

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 Explain mottled leaf.

Mottled leaf is that leaf which has yellow and green patches or areas or partial chlorosis and having reduced leaf size. It is caused by the deficiency of zinc, phosphorous etc.
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What is necrosis.

Necrosis is the death of tissues and cells. It is caused by the deficiency of phosphorous, calcium etc. 
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What is Plant nutrition ? 

Plant nutrition is the process which involves taking up of materials from soil and atmosphere and utilizing those materials for the manufacturing of food as well as growth, development and reproduction.
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Briefly exlpain protein carrier molecules


Protein carrier molecules : Carrier proteins facilitate the diffusion of different molecules, to which they have specificity, one molecule at the time is allowed to bind to carrier protein and is released on the other side of the membrane. These are present in plasmalemma. These molecules take energy from ATP molecules and then pick up mineral molecules from the soil and carry them inward and release into cytoplasm.

Mineral absorption through carrier molecules


Mineral absorption through carrier molecules

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