General Knowledge - Biology - Discussion

Discussion Forum : Biology - Section 1 (Q.No. 10)
Plants absorb dissolved nitrates from soil and convert them into
free nitrogen
Answer: Option
No answer description is available. Let's discuss.
40 comments Page 1 of 4.

Upasana said:   2 years ago
Plants can never convert nitrate into free nitrogen. Only bacteria can do it.

Zdenek Micke said:   1 year ago
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.

Dr Sangeetha said:   2 years ago
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.

OJE said:   7 years ago
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.

Grace gyara said:   3 years ago
The answer is (C) Ammonia.

Ravi said:   9 years ago
The answer is ammonia.

Atmospheric nitrogen is converted into nitrate and nitrite forms by the free living (e.g. Azatobacter) or symbiotic bacteria (e.g: Rhizobium in root nodules of leeguminous plants). Plant roots then absorb nitrite form and subsequently convert it into ammonia.

Later on, ammonia is utilized for biosynthesis of nitrogen containing compounds like amino acids and nucleotides etc. When plant dies, the denitrifying bacteria act upon these compounds and free nitrogen can be released into atmosphere.

BHAGYA said:   9 years ago
Convert nitrates into ammonia for making amino acids.

Saurav pathak said:   9 years ago
If plants convert into free nitrogen. So from where does come out from the plant body?

Sikinder said:   9 years ago
I don't agree because, Nitrates in the soil gets converted to ammonia, am I correct?

Anmol said:   9 years ago
They ultimately convert it into N2.

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