General Knowledge - Biology - Discussion

Plants absorb dissolved nitrates from soil and convert them into proteins.

@Dr Sangeetha.

All of the statements are partially correct:

Plants absorb dissolved nitrates from soil and convert them into nitrogen-containing biomolecules like amino acids, proteins, and nucleic acids. However, plants can also take up molecular nitrogen through a process called nitrogen fixation, which is carried out by certain bacteria in the soil or in symbiotic associations with plants.

Nitrogen is recycled into the atmosphere by soil bacteria through a process called denitrification, in which nitrates are converted back into molecular nitrogen.

Atmospheric nitrogen is not utilized directly by most organisms, but it can be fixed into a usable form by certain bacteria, such as those found in the root nodules of leguminous plants.

Note: Plants cannot convert nitrate into free nitrogen, but instead use it to synthesize various nitrogen-containing biomolecules. Only certain types of bacteria, such as nitrogen-fixing bacteria, have the ability to convert atmospheric nitrogen into a form that can be utilized by other organisms, such as ammonia or nitrate.

The given answer is wrong.

The nitrogen present in nitrates is utilized by various biosynthetic pathways, to synthesise various nitrogen-containing biomolecules, like, amino acids, proteins, nucleic acids etc.

Plants neither release nor use molecular nitrogen directly.

Nitrogen is recycled into the atmosphere by soil bacteria acting on the organic matter in the soil by decomposition.

Atmospheric nitrogen is utilized only by nitrogen-fixing bacteria, which are symbiotic Or symbiotic like in root nodules of leguminous plants.

Plants can never convert nitrate into free nitrogen. Only bacteria can do it.

The answer is (C) Ammonia.

I can't understand it. Anyone explain it.

I don't agree I go for ammonia when talk about nitrification.

No, because plant is not to supply nitrogen back to the atmosphere. Nitrogen can only be supplied back to the atmosphere by the process of denitrification by azontobacter. The nitrate absorbed by plant should be converted to a nitrogen-containing organic compound Eg: protein.

That is protein, see first byproducts of plant cycle. There is no need to plans converts nitrate to nitrogen. Free nitrogen is abundantly present in atm which does not directly use full to plant its need in absorption form.

I think C option is correct.

Could you please explain how it converts?