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 · Medium

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1 Medium

1 of 90

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.

2 Medium

2 of 90

Remembering +4 | -1

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

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Correct option: B

Potassium

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

3 Medium

3 of 90

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.

4 Medium

4 of 90

Understanding +4 | -1

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

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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.

5 Medium

5 of 90

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.

6 Medium

6 of 90

Understanding +4 | -1

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

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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.

7 Medium

7 of 90

Analyzing +4 | -1

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

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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.

8 Medium

8 of 90

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.

9 Medium

9 of 90

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

10 Medium

10 of 90

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.

11 Medium

11 of 90

Remembering +4 | -1

Insectivorous plants live in a soil that is usually deficient in

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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.

12 Medium

12 of 90

Remembering +4 | -1

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

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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.

13 Medium

13 of 90

Understanding +4 | -1

Choose a true statement regarding essential mineral elements of plants

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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.

14 Medium

14 of 90

Remembering +4 | -1

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

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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.

15 Medium

15 of 90

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.

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16 Medium

16 of 90

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.

17 Medium

17 of 90

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.

18 Medium

18 of 90

Understanding +4 | -1

Which of the following statements are not correct in reference to hydroponics?
I. It determines the mineral nutrients essential for the plants
II. The hydroponics involves the culture of plants in a soil with, defined mineral solution
III. Hydroponics requires purified water with non-defined mineral nutrient salts
IV. In the hydroponics technique, plants are grown in sandy soil with nutrient solution
V. By this method, essential elements required for the growth of plants can be identified and their deficiency symptoms can also be discovered
Choose the correct options

View answer and explanation

Correct option: C

Only III

Option C (Only III) is correct because hydroponics requires defined, not non-defined, mineral nutrient salts.

19 Medium

19 of 90

Remembering +4 | -1

Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?

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Correct option: A

Casuarinas equisetifolia

Option A is correct because Casuarina equisetifolia is a flowering plant (angiosperm) that forms root nodules containing the nitrogen-fixing filamentous bacterium Frankia.

20 Medium

20 of 90

Understanding +4 | -1

Mark the statements as true/ false by choosing the correct option from the set (I-IV) given below
I. Magnesium is a constituent of chlorophyll and helps to maintain the ribosome structure
II. Calcium is needed during the formation of mitotic spindle
III. Magnesium is essential for the photolysis of water
IV. Zinc helps in sugar translocation

View answer and explanation

Correct option: A

I-True, II-True, III-False, IV-False

Option A (I-True, II-True, III-False, IV-False) is correct because Magnesium is a constituent of chlorophyll and helps maintain ribosome structure, Calcium is needed during mitotic spindle formation, Magnesium is not essential for photolysis of water, and Zinc helps in auxin synthesis, not sugar translocation.

21 Medium

21 of 90

Remembering +4 | -1

Hydroponics is the method of

View answer and explanation

Correct option: B

Plant development in water without soil

Option B (Plant development in water without soil) is correct because hydroponics involves growing plants in a water-based nutrient solution without the use of soil.

22 Medium

22 of 90

Remembering +4 | -1

Sulphur is found as a constituent in which of the following amino acids?

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Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because sulphur is a constituent of both cysteine and methionine amino acids.

23 Medium

23 of 90

Remembering +4 | -1

Which of the following is a bacterium involved in denitrification?

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Correct option: C

Pseudomonas

Option C (Pseudomonas) is correct because Pseudomonas is a bacterium known for its role in denitrification.

24 Medium

24 of 90

Remembering +4 | -1

In the final phase of mineral absorption ions are taken up

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Correct option: A

Slowly

Option A (Slowly) is correct because the final phase of mineral absorption involves a slower, metabolically controlled uptake of ions.

25 Medium

25 of 90

Remembering +4 | -1

Hydroponics is the growth of plants in

View answer and explanation

Correct option: C

Water containing essential nutrients

Option C (Water containing essential nutrients) is correct because hydroponics involves providing plants with all necessary nutrients dissolved in water, without soil.

26 Medium

26 of 90

Analyzing +4 | -1

Assertion (A): Soyabean export the fixed nitrogen as ureides.

Reason (R): Amides contain excess nitrogen and they are transported via phloem sieve tubes.

View answer and explanation

Correct option: C

(A) is true and (R) is false

Option C ((A) is true and (R) is false) is correct because soybean does export fixed nitrogen as ureides, but amides, not ureides, are transported via phloem sieve tubes.

27 Medium

27 of 90

Remembering +4 | -1

Nitrogen is present in the soil in the form of I. Nitrates II. Ammonial salts III. Nitrite IV. None of these

View answer and explanation

Correct option: C

I and II

Option C is correct because nitrogen in the soil is primarily found in the forms of nitrates (NO3-) and ammonium salts (NH4+), which are readily available for plant uptake.

28 Medium

28 of 90

Remembering +4 | -1

VAM is

View answer and explanation

Correct option: B

Endomycorrhizae

Option B is correct because VAM stands for Vesicular-Arbuscular Mycorrhizae, which are a type of endomycorrhizae where the fungal hyphae penetrate the root cells.

29 Medium

29 of 90

Understanding +4 | -1

Hydroponic tomatoes may not taste so fresh. Why?

View answer and explanation

Correct option: C

They are picked too soon

Option C (They are picked too soon) is correct because hydroponic tomatoes are often harvested before they are fully ripe to extend shelf life, which can affect their taste.

30 Medium

30 of 90

Understanding +4 | -1

Which of the given options are correct for hydroponics? Select the correct pair
I. Hydroponics technique is useful in areas having infertile and dry soils
II. Hydroponics can regulate pH optimum for a particular crop
III. It increases the labour cost
IV. It increases the problem of weeding

View answer and explanation

Correct option: B

I and II

Option B (I and II) is correct because hydroponics is useful in infertile areas and allows for precise pH regulation.

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