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NEET • BIOLOGY • MINERAL NUTRITION

Mineral nutrition practice · Hard

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Showing 1-30 of 38 questions

1 Hard

1 of 38

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 Hard

2 of 38

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.

3 Hard

3 of 38

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.

4 Hard

4 of 38

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.

5 Hard

5 of 38

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.

6 Hard

6 of 38

Understanding +4 | -1

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

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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.

7 Hard

7 of 38

Remembering +4 | -1

The leghaemoglobin that imparts pink-red colour to the root nodules is located in

View answer and explanation

Correct option: D

Between bacteroids and surrounding

Option D (Between bacteroids and surrounding) is correct because leghaemoglobin is located in the space between the bacteroids (Rhizobium cells) and the plant cell cytoplasm within the root nodule.

8 Hard

8 of 38

Understanding +4 | -1

What is the key principle of the EBB and flow system in hydroponics?

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Correct option: A

It floods and drains periodically

Option A (It floods and drains periodically) is correct because the EBB and flow system works by periodically flooding the growing area with nutrient solution and then draining it.

9 Hard

9 of 38

Understanding +4 | -1

The microelement, which is an integral part of the electron carrier which transfers electrons for cyt-b-f complex to PS-I is a component of

View answer and explanation

Correct option: B

Cytochrome-'

\mathrm{C}

'-oxidase

Option B (Cytochrome-'

\mathrm{C}

'-oxidase) is correct because iron is an integral part of cytochromes, which are electron carriers in the electron transport chain.

10 Hard

10 of 38

Understanding +4 | -1

Assertion (A): Amides are transported to other parts of plant via xylem vessels.

Reason (R): Amides contain more nitrogen than the amio acids.

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A (Both (A) and (R) are true and (R) is the correct explanation of (A)) is correct because amides are indeed transported via xylem, and they contain more nitrogen than amino acids, making them efficient for nitrogen transport.

11 Hard

11 of 38

Understanding +4 | -1

\alpha -

ketoglutaric acid

\mathrm{ + N}{\mathrm{H}_\mathrm{4}} + NADPH\xrightarrow{{'A'}}\mathrm{glutamate} + {\mathrm{H}_\mathrm{2}}\mathrm{O} + NADP\,\,'A'\,\mathrm{stand}\,\mathrm{for}\,\mathrm{?}

View answer and explanation

Correct option: A

Glutamate dehydrogenase

Option A (Glutamate dehydrogenase) is correct because glutamate dehydrogenase catalyzes the reductive amination of alpha-ketoglutarate to form glutamate.

12 Hard

12 of 38

Understanding +4 | -1

Which one of these do plants require for the formation of adenosine triphosphate?

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Correct option: C

N, P

Option C (

N, P

) is correct because nitrogen and phosphorus are essential components of adenosine triphosphate (ATP).

13 Hard

13 of 38

Understanding +4 | -1

Clay and organic matter of soil have negative charge Clay and organic matter of soil have negative charge, They attract positively charged ions like

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because negatively charged clay and organic matter attract positively charged ions like

C{a^{2 + }}

M{g^{2 + }}

, and

{K^ + }

14 Hard

14 of 38

Remembering +4 | -1

Asparagine and glutamine are the two most important

View answer and explanation

Correct option: B

Amides

Option B (Amides) is correct because asparagine and glutamine are amides, which are nitrogen-containing compounds derived from aspartic acid and glutamic acid, respectively.

15 Hard

15 of 38

Remembering +4 | -1

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning prevented by:

View answer and explanation

Correct option: B

Leghaemoglobin

Option B (Leghaemoglobin) is correct because leghaemoglobin scavenges oxygen, protecting nitrogenase from inactivation during biological nitrogen fixation.

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16 Hard

16 of 38

Understanding +4 | -1

Select the mismatched pair.

View answer and explanation

Correct option: B

\mathrm{Zn}^{2+}

- Activate catalase

Option B (

\mathrm{Zn}^{2+}

- Activate catalase) is correct because Zinc activates alcohol dehydrogenase and carboxylases, not catalase. Catalase is activated by Iron.

17 Hard

17 of 38

Understanding +4 | -1

The enzyme nitrogenase is highly sensitive to the molecular oxygen as it requires anaerobic condition. In nodule anaerobic condition is provided by

View answer and explanation

Correct option: C

Leghaemoglobin

Option C (Leghaemoglobin) is correct because leghaemoglobin scavenges oxygen in the nodules, creating an anaerobic environment for nitrogenase.

18 Hard

18 of 38

Understanding +4 | -1

When a plant undergoes senescence, the nutrients may be?

View answer and explanation

Correct option: C

translocated

Option C (translocated) is correct because during senescence, plants remobilize nutrients from older tissues to younger, developing tissues.

19 Hard

19 of 38

Understanding +4 | -1

C,H,O

and

N

are called structural elements?

View answer and explanation

Correct option: C

They are invariably present in all biomolecules

Option C (They are invariably present in all biomolecules) is correct because carbon, hydrogen, oxygen, and nitrogen are fundamental elements found in all organic biomolecules.

20 Hard

20 of 38

Understanding +4 | -1

The most important role of

\mathrm{k}^{+}

ions is that

View answer and explanation

Correct option: C

It influences many enzymic activities which regulate many plant processes.

Option C (It influences many enzymic activities which regulate many plant processes) is correct because potassium ions play a crucial role in activating enzymes involved in various plant processes.

21 Hard

21 of 38

Remembering +4 | -1

Premature leaf fall is due to deficiency of?

View answer and explanation

Correct option: D

Phosphorus

Option D (Phosphorus) is correct because phosphorus deficiency can lead to premature leaf fall in plants due to its role in energy transfer and overall plant health.

22 Hard

22 of 38

Understanding +4 | -1

At physiological pH, for the formation of ammonium ion, ammonia is

View answer and explanation

Correct option: A

Protonated

Option A (Protonated) is correct because ammonia (

NH_3

) accepts a proton (

H^+

) to form the ammonium ion (

NH_4^+

) at physiological pH.

23 Hard

23 of 38

Remembering +4 | -1

Legheamoglobin is produced in response to?

View answer and explanation

Correct option: D

{N_2}

- fixation

Option D (

{N_2}

- fixation) is correct because leghaemoglobin production is induced in response to nitrogen fixation in root nodules.

24 Hard

24 of 38

Remembering +4 | -1

The bond in molecular nitrogen

({N_2})

is difficult to break, because it is a

View answer and explanation

Correct option: C

Triple covalent bond

Option C (Triple covalent bond) is correct because molecular nitrogen (

N_2

) has a strong triple covalent bond between the two nitrogen atoms.

25 Hard

25 of 38

Understanding +4 | -1

Which of the following statements are correct?
(i) Solution culture/hydroponics contains all essential minerals except one, the usefulness of which is to be determined.
(ii)

{Na},{Si},{Co}

and selenium are beneficial element required by higher plants.
(iii)

{Zn}

is the activator of nitrogenases while

{Mo}

is the activator of alcohol dehydrogenase.

(iv)

{Zn}

is needed for auxin synthesis.

View answer and explanation

Correct option: B

(i), (ii), (iv)

Option B ((i), (ii), (iv)) is correct because these statements accurately describe aspects of plant nutrition and essential elements.

26 Hard

26 of 38

Remembering +4 | -1

Which one is the major constituent of proteins, nucleic acids, vitamins and hormones?

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Correct option: B

Option B (N) is correct because nitrogen is a major constituent of proteins, nucleic acids, vitamins, and hormones.

27 Hard

27 of 38

Remembering +4 | -1

The primary amino acid from which other 17 amino acids are formed through the process of transamination is

View answer and explanation

Correct option: C

Glutamic acid

Option C (Glutamic acid) is correct because glutamic acid is the primary amino acid involved in transamination reactions to form other amino acids.

28 Hard

28 of 38

Understanding +4 | -1

Which of the following factors is not essential for early growth of plants?

View answer and explanation

Correct option: D

Light duration

Option D (Light duration) is correct because while light is essential, the *duration* of light (photoperiod) is less critical for *early* growth compared to micronutrients, temperature, and oxygen.

29 Hard

29 of 38

Understanding +4 | -1

Ion transport in root occurs
i) Passively through channels
ii) Actively through channels
iii) Actively through carriers
iv) Through both symplast and apoplast.

View answer and explanation

Correct option: C

(i), (iii) and (iv)

Option C ((i), (iii) and (iv)) is correct because ions can move passively through channels, actively through carriers, and through both symplast and apoplast pathways.

30 Hard

30 of 38

Remembering +4 | -1

Necrosis of leaf tissue occurs due to deficiency of which of the given set of elements?

View answer and explanation

Correct option: C

{Ca}, {Mg}, {Cu},{K}

Option C (

{Ca}, {Mg}, {Cu},{K}

) is correct because deficiencies in Calcium, Magnesium, Copper, and Potassium are known to cause necrosis of leaf tissue.

Revision notes and key takeaways

Review MINERAL NUTRITION in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 38 single-correct-answer MCQs on MINERAL NUTRITION.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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