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Nitrogen Fixation and Photosynthesis

Nitrogen Fixation and Photosynthesis
Plants absorb nitrates from soil and convert them into

nitrogen
ammonia
urea
none of these

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Nitrogen Fixation and Photosynthesis
Which of the following bacteria genus is capable of oxidizing ammonia (NH4)?

Nitrospina
Nitrosococcus
Nitrobacter
Nitrosobacter

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Nitrogen Fixation and Photosynthesis
The chief source of nitrogen for green plants is

low molecular weight- organic nitrogenous compound
nitrates
ammonium salts
atmospheric nitrogen

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Nitrogen Fixation and Photosynthesis
An organism that relies exclusively on pre-synthesized food molecules is

autotrophic
photosynthetic
heterotrophic
prokaryotic

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Nitrogen Fixation and Photosynthesis
In the Calvin cycle of C3 plants, which molecule is the acceptor of CO2?

Alpha-ketoglutarate
Ribulose-l,5-diphosphate
Ribose-5-phosphate
Erythrose-4-phosphate

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Nitrogen Fixation and Photosynthesis
During nitrogen fixation the enzyme nitrogenase catalyse the reaction. The reaction is high energy demanding which require approximately

7 ATP
18 ATP
25 ATP
12 ATP

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