SCIENCE
PLANT KINGDOM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Grasses
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Legumes
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Sedges
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Orchids
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Detailed explanation-1: -Nitrogen is present in the free gaseous state in the atmosphere. Plants cannot absorb directly. But they can absorb nitrogen in form of nitrites and nitrates present in the soil. Atmospheric nitrogen is converted into usable forms by microbes present in the soil.
Detailed explanation-2: -Legumes are able to form a symbiotic relationship with nitrogen-fixing soil bacteria called rhizobia. The result of this symbiosis is to form nodules on the plant root, within which the bacteria can convert atmospheric nitrogen into ammonia that can be used by the plant.
Detailed explanation-3: -Overview: The nitrogen cycle involves three major steps: nitrogen fixation, nitrification, and denitrification. It is a cycle within the biosphere which involves the atmosphere, hydrosphere, and lithosphere.
Detailed explanation-4: -Plant species. Alfalfa and clovers are the best nitrogen-fixing cover crops in terms of capacity.