Biology Questions and Answers
Producers fix nitrogen mainly from
nitrate nitrogen from ammo(NO 3 - ). Some plants also fixnia. Consumers a (^) nd
decomposers acquire nitrogen through
digestion of mainly pracids from the body of other livingoteins and nucleic
beings.
- What is the nitrogen
cycle?
The nitrogen cycle represents the
circulation anelement nitrod recycling ogen in nature.f the chemical
The nitrogen cycle basicallythe action of some specialized b depends onacteria.
Bacteria of the soil called nitrogen-fixing
bacteriamolecular nitro present igen from the air ann plant roots absorbd
liberate nammonia. Thitrogen in the form ofe decomposition o (^) f organic
material also produces ammonia. In the
soil and roots (mainly of plants), a first group of chemosyntheticleguminous (^)
bacteria called nitrifying bacteria, the
nitrosomconsuming onas, prammonia aoduces ennd releasinergy (^) g
nitrite (NO 2 ). The second group of
nitrifying bacteria,uses nitrite in chemosynthesis the nitrobacteria, releasing (^)
nitrate (NO 3 ). In the form of nitrate,
nitrogen is then incorporatto be used as constituent of proteinsed by plants
and nucleic acids and the element then
follows along the food chain. Nitrogreturns to the atmosphere by the actionen (^)
of denitrifying bacteria that use
nitrogen-containinthe soil and release g compounds fromnitrogen gas
(molecular nitrogen).
- Why is a leguminous crop
rotation used in agriculture?
Leguminous crop rotation and other
crop rotations arbecause in these plants many be used in agriculturacteriae (^)
important for the nitrogen cycle live.
The leguminocojointly with the main crous crop rotation (op) helps thr (^) e
soil to become rich in nitrates that are
then absorbed by the plants.
Green manure, the covering of the soil
with grass and leguminous plaalso a way to improve the fixation nts, isof (^)
nitrogen and it is an option in avoiding
chemical fertilizers.
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