Discussion
Arrange the following steps of fixation of atmospheric nitrogen in the correct sequence :
(A) Uptake of compounds of nitrogen by plants through the root system
(B) Synthesis of plant proteins and other compounds
(C) Conversion of nitrogenous wastes from dead plants and animals into nitrogenous compounds
(D) Fixation of nitrogen from atmosphere by certain bacteria and blue-green algae
Choose the correct option.
Answer: C
The correct sequence is (D) → (A) → (B) → (C).
- (D) Bacteria such as Rhizobium and blue-green algae fix atmospheric nitrogen into compounds in the soil.
- (A) Plants take up these nitrogen compounds through their roots.
- (B) Plants use them to build proteins and other compounds, which pass to animals through food.
- (C) When plants and animals die, bacteria and fungi convert their nitrogenous wastes back into nitrogen compounds.
Option A puts decomposition before uptake, option B starts with uptake before any fixation, and option D has plants making proteins before they absorb nitrogen.
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