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.

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.

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.

Sam said:   8 years ago
From my point of view:

When nitrogen in combine state with oxygen (No2), is brought to the ground through thunderstorm, nitrogen fixing bacteria's, like nitrosomers, nitrobacter, etc, in the root nodules of plant, convert it to nitrite and then to nitrogen. Thereby liberation oxygen making it absorb-able by plant.

M k s said:   1 decade ago
Plants obtain nitrogen through their roots in either the form of nitrate or ammonium. Atmospheric nitrogen N2 cannot be utilized by the Plant. So, consequence of N-cycle plants uptake nitrate which depleted or converted to free nitrogen and further, it utilized for protein synthesis.

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.

Nia john said:   1 decade ago
In the soil ammonia gets oxidised to nitrates and bthen to nitrites. Plants takes up this nitrites which are reconverted to ammonia in the surface of leaves. And the excess nitrites present in the soil gets reduced to free nitrogen.

Vaibhav said:   7 years ago
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.

Don said:   1 decade ago
When a plant process photosynthesis, last products are O2, glucose, also it gives a free N2.

Because plant don't give us 100% O2 it also consist some part of N2, CO2.

Therefore last product is N2, answer A is correct.

Atitsoe Lawrencia said:   1 decade ago
I do not agree I think the nitrates is used by the plant for synthesis of protein after which a bacterium in the soil called Planococcus reduces it to to atmospheric nitrogen.

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