The process of conversion of soil nitrates into free ${{\rm{N}}_{\rm{2}}}$ is called (I) and is carried out by bacteria (II)

I-Nitrification, II- Nitrosomonas

I- Denitrification, II- Nitrobacter

$I - {\rm{ }}{N_2}\,\,fixation,{\rm{ }}II - {\rm{ }}Rhizobium$

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NEET • BIOLOGY • MINERAL NUTRITION

Mineral nutrition practice · Mixed difficulty

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1 Hard

1 of 199

Remembering +4 | -1

Toxicity of

Mn

prevent / affect uptake of

View answer and explanation

Correct option: A

{Fe}

Option A (

{Fe}

) is correct because Manganese toxicity often interferes with the uptake and utilization of Iron.

2 Medium

2 of 199

Understanding +4 | -1

Select the match ones.
I Nitrosomonas – Nitrite to nitrate
II Thiobacillus - Denitrification
III Nostoc - Free-living nitrogen-fixer
IV Azotobacter - Anaerobic nitrogen-fixer

View answer and explanation

Correct option: C

II and III

Option D (II and III) is correct because Thiobacillus is involved in denitrification and Nostoc is a free-living nitrogen-fixer.

3 Medium

3 of 199

Remembering +4 | -1

Deficiency of which to the following can cause yellowing of intravenous regions of leaves?

View answer and explanation

Correct option: B

Potassium

Option B (Potassium) is correct because potassium deficiency often manifests as yellowing (chlorosis) between the veins (intravenous regions) of leaves.

4 Medium

4 of 199

Remembering +4 | -1

Which among the following are used as media for hydroponics?

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Correct option: D

All of these

Option D (All of these) is correct because coco coir, rockwool, and gravel are all commonly used as inert media in hydroponic systems to support plant roots.

5 Medium

5 of 199

Understanding +4 | -1

Elements mainly involved in cell membrane synthesis, in normal functioning of the cell membrane are

View answer and explanation

Correct option: C

N,P,K,Ca

Option B (

P,Ca

) is correct because phosphorus and calcium are essential for cell membrane synthesis and normal functioning.

6 Medium

6 of 199

Remembering +4 | -1

The major characteristics of colloids is/are

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Correct option: D

Both (a) and ©

Option D (Both (a) and (c)) is correct because colloids typically have a charged surface and are often brittle.

7 Medium

7 of 199

Understanding +4 | -1

Which of the following is true regarding manganese toxicity in plants?

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because manganese toxicity in plants can induce deficiencies of iron, magnesium, and calcium, cause brown spots surrounded by chlorotic veins, and inhibit Ca2+ ion translocation.

8 Hard

8 of 199

Understanding +4 | -1

Assertion: Nitrogenase enzyme gets inactivated in presence of oxygen yet

{N_2}

fixation occurs in aerobic cells of legume nodules.
Reason: Leghaemoglobin allows presence of oxygen just sufficient for cellular respiration only.

View answer and explanation

Correct option: A

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because nitrogenase is oxygen-sensitive, and leghaemoglobin maintains a low oxygen environment.

9 Easy

9 of 199

Understanding +4 | -1

Which of the following elements are most readily mobilized?

View answer and explanation

Correct option: A

Phosphorous, nitrogen, potassium

Option A (Phosphorous, nitrogen, potassium) is correct because these elements are readily remobilized from older leaves to younger, developing parts of the plant.

10 Medium

10 of 199

Analyzing +4 | -1

Find out odd one form the following options by considering its role in nitrogen cycle.

View answer and explanation

Correct option: C

Pseudomonas

Option C (Pseudomonas) is the odd one out because it is primarily involved in denitrification, while the others are involved in nitrogen fixation.

11 Easy

11 of 199

Understanding +4 | -1

The plants grown in "

Mg

" deficient but area sprayed soil would show?

View answer and explanation

Correct option: C

Yellowing of leaves

Option C (Yellowing of leaves) is correct because magnesium is a component of chlorophyll, and its deficiency leads to chlorosis (yellowing).

12 Medium

12 of 199

Analyzing +4 | -1

Which of the following statements about the nitrogen cycle are false?
I) Rhizobium and Frankia cause nitrogen fixation in their independent free-living stage.
II) Azotobacter and Anabaena are anaerobic, symbiotic, free-living, nitrogen fixers.
III) Rhodospirillum is an aerobic, nitrogen fixing microbe found in the root nodules of legumes.
IV) Nitrobacter oxidizes nitrites to nitrates.

View answer and explanation

Correct option: C

I, II and III

Option C is correct because statements I, II, and III are false. Rhizobium and Frankia are symbiotic nitrogen fixers, Azotobacter and Anabaena are not both anaerobic and symbiotic, and Rhodospirillum is not found in root nodules.

13 Easy

13 of 199

Understanding +4 | -1

Which of the following is an example of nutrient in its reduced form?

View answer and explanation

Correct option: C

Nitrogen in

N{H_3}

Option C (Nitrogen in

NH_3

) is correct because nitrogen in ammonia (

NH_3

) has a lower oxidation state (-3) compared to its elemental state, indicating it is in a reduced form.

14 Easy

14 of 199

Understanding +4 | -1

Crop rotation is used by farmers to increase

View answer and explanation

Correct option: A

Soil fertility

Option A (Soil fertility) is correct because crop rotation helps to improve soil structure, nutrient availability, and reduce pest and disease buildup, all contributing to increased soil fertility.

15 Medium

15 of 199

Understanding +4 | -1

Phosphorus is absorbed by the plants as I.

{H_2}P{O_4^ - }

II.

HP{O_4}

III.

HP{O^{2 - }}_4

IV.

{H_2}P{O^ - }

View answer and explanation

Correct option: C

I and III

Option C (I and III) is correct because plants absorb phosphorus primarily as

{H_2}P{O_4^ - }

and

HP{O^{2 - }}_4

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16 Easy

16 of 199

Understanding +4 | -1

For the limited nitrogen that is present in the soil, microbes compete with

View answer and explanation

Correct option: B

Plants

Option B (Plants) is correct because microbes in the soil compete with plants for the limited nitrogen available.

17 Medium

17 of 199

Understanding +4 | -1

The process of conversion of soil nitrates into free

{\mathrm{N}_\mathrm{2}}

is called (I) and is carried out by bacteria (II)

View answer and explanation

Correct option: C

I-Denitrification, II-Thiobacillus

Option C (I-Denitrification, II-Thiobacillus) is the correct answer because denitrification converts soil nitrates into free N2, and certain bacteria like Thiobacillus can carry out this process.

18 Easy

18 of 199

Understanding +4 | -1

Number of ATP required for the formation of

4N{H_3}

molecules via symbiotic nitrogen fixation is

View answer and explanation

Correct option: B

Option B (32) is correct because symbiotic nitrogen fixation requires 8 ATP per

NH_3

molecule, so for 4

NH_3

molecules, it requires 32 ATP.

19 Easy

19 of 199

Remembering +4 | -1

Molybdenum is the essential constituent of

View answer and explanation

Correct option: A

Nitrogenase

Option A (Nitrogenase) is correct because molybdenum is a crucial component of the nitrogenase enzyme, which is essential for nitrogen fixation in plants and bacteria.

20 Medium

20 of 199

Remembering +4 | -1

Insectivorous plants live in a soil that is usually deficient in

View answer and explanation

Correct option: A

Nitrate

Option A (Nitrate) is correct because insectivorous plants typically grow in soils deficient in nitrogen, particularly in the form of nitrates, and they have adapted to obtain nitrogen from insects.

21 Medium

21 of 199

Remembering +4 | -1

Deficiency of which of the given sets of elements causes necrosis?

View answer and explanation

Correct option: C

Ca, Mg, Cu and K

Option C (Ca, Mg, Cu and K) is correct because deficiencies in Calcium (Ca), Magnesium (Mg), Copper (Cu), and Potassium (K) are known to cause necrosis in plants.

22 Hard

22 of 199

Remembering +4 | -1

The enzyme nitrogenase is

View answer and explanation

Correct option: B

Found in prokaryotes only

Option B (Found in prokaryotes only) is correct because the enzyme nitrogenase, responsible for nitrogen fixation, is exclusively found in prokaryotic organisms.

23 Hard

23 of 199

Understanding +4 | -1

Assertion: Nitrogen-fixing enzyme in legume root nodules functions at low oxygen concentration.
Reason: Low oxygen concentration is provided by leghaemoglobin.

View answer and explanation

Correct option: A

If both Assertion and Reason are correct and Reason is a correct explanation of Assertion

Option A (If both Assertion and Reason are correct and Reason is a correct explanation of Assertion) is correct because nitrogenase functions at low oxygen concentrations, and leghaemoglobin provides this condition.

24 Medium

24 of 199

Understanding +4 | -1

Choose a true statement regarding essential mineral elements of plants

View answer and explanation

Correct option: C

Plants growing near the nuclear test sites takes up the radioactive strontium

Option C (Plants growing near the nuclear test sites takes up the radioactive strontium) is correct because plants can absorb radioactive elements from the soil.

25 Hard

25 of 199

Understanding +4 | -1

Mycorrhizae are useful for plants because they

View answer and explanation

Correct option: B

Enhance absorption of nutrients from the soil

Option B (Enhance absorption of nutrients from the soil) is correct because mycorrhizae increase the surface area for nutrient and water absorption by the plant roots.

26 Hard

26 of 199

Understanding +4 | -1

If a plant is deficient in ___________, it will not be able to make DNA.

View answer and explanation

Correct option: A

Phosphorus (P)

Option A (Phosphorus (P)) is correct because Phosphorus is a crucial component of DNA and RNA, and a deficiency would prevent DNA synthesis.

27 Medium

27 of 199

Remembering +4 | -1

Hydroponics has been successfully employed as a technique for which of the following vegetables?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because seedless cucumbers, tomatoes, and lettuce are all commonly and successfully grown using hydroponic techniques.

28 Medium

28 of 199

Remembering +4 | -1

The appearance of yellow edges in leaves is due to the deficiency of this mineral element.

View answer and explanation

Correct option: C

Potassium

Option C (Potassium) is correct because potassium deficiency often manifests as yellow edges on leaves.

29 Medium

29 of 199

Analyzing +4 | -1

Find out the odd one w.r.t. role of potassium in plants.

View answer and explanation

Correct option: A

Synthesis of middle lamella

Option A (Synthesis of middle lamella) is correct because calcium, not potassium, is primarily involved in the synthesis of the middle lamella.

30 Medium

30 of 199

Analyzing +4 | -1

Assertion : Manganese is an activator of enzyme nitrite reductase.

Reason : Manganese deficient cells prefer ammonia over nitrate.

View answer and explanation

Correct option: A

If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because Manganese activates nitrite reductase, and manganese-deficient cells prefer ammonia over nitrate due to impaired nitrate reduction.

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Key Takeaways

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