Answer and Explanation: So the plant/algae take nitrogen from the topsoil by captivating through roots, such as the Glutaminic Acids, ammonium ions, or nitrate ions. Plants can't necessarily get nitrogen from instant air, however, plants obtain nitrogen through a natural process.
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The part of plant/algae that contains nitrogen are the roots.
Most organisms contain nitrogen as it is the most abundant element in the
atmosphere. Nitrogen fixing bacteria such as Rhizobium helps to fix
nitrogen from the soil into the root of plants.
The fixed nitrogen then forms the root nodules and this helps in the
development and survival of plants as it is a very important form of
nutrient used during metabolism.
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