Mineral Nutrition Test

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Mineral Nutrition Test - 46

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Weekly Quiz Competition

Question 1
1 / -0

The rate limiting step of nitrification

A
Oxidation of ammonia to nitrite

B
Oxidation of nitrite to nitrate

C
Conversion of nitrogen to ammonia

D
All of these
Solution
- Nitrification is the biological oxidation of ammonia to nitrite followed by oxidation of nitrite to nitrate.
- Stoichiometrically, 4.6 kg of oxygen is required for nitrifying 1 kg of nitrogen.
- Under steady-state conditions, experimental evidence has shown nitrite accumulation to be insignificant. This suggests that the rate-limiting step for the conversion of ammonium to nitrate is the oxidation of ammonium to nitrite by the genus Nitrosomonas.
So, the correct answer is option A.
Question 2
1 / -0

Nitrogen-fixing bacteria are important because

A
They turn nitrogen from the air into nitrogen compounds in the soil

B
They are essential for plants being able to carry out photosynthesis

C
They break up dead plants and animals in the soil

D
They release excess nitrogen from the soil into the atmosphere

Solution

Cells are built out of protein molecules; these are organic molecules built around carbon and nitrogen. To grow, plants need protein, and for this plants need nitrogen. Nitrogen is a very essential element and is found in the various forms like the proteins, nucleic acids (DNA & RNA ) some vitamins, alkaloids, and urea. Plants cannot absorb atmospheric nitrogen but Nitrogen-fixing bacteria take atmospheric nitrogen (N2) and convert it to nitrates (NO) in the soil. This is then absorbed by plants.
So, the correct answer is 'They turn nitrogen from the air into nitrogen compounds in the soil'.
Question 3
1 / -0

Which elements are essential for photolysis of water?

A
$$Mg$$ and $$P$$

B
$$Ca$$ and $$Mg$$

C
$$Zn$$ and $$Mg$$

D
$$Mn$$ and $$Cl$$

Solution

Photolysis of water occurs during non cyclic electron flow. During non cyclic electron flow, the ultimate source of electrons is water. The water molecule is split in a process, called as photolysis. The electrons are ultimately used in reduction of oxidised NADP to form reduced $$NADPH_2$$. The oxygen is released as a byproduct of photosynthesis. The mineral ions essential for photolysis are manganese, chlorine and calcium.
Question 4
1 / -0

Rhizobium found in root nodules of leguminous plants plays the role of

A
Atmospheric carbon dioxide fixation

B
Atmospheric oxygen fixaton

C
Atmospheric nitrogen fixation

D
All of the above

Solution

Rhizobium is a bacterium found in the root nodules of leguminous plants. It induces the formation of special structures called nodules inside which it fixes atmospheric nitrogen. It does this with the help of nitrogenase enzyme that converts of nitrogen to ammonium that is an important factor required for plant growth. In turn, the bacterium receives shelter from the plant. Thus the correct answer is option C.
Question 5
1 / -0

Critical elements for the plant growth are

A
Na, K, and Ca

B
Na, P, and Mg

C
N, P and K

D
Mn, B and Mo

Solution

Besides water and sunlight, plants need several nutrients to grow which are obtained from the soil. The critical elements required for their growth include nitrogen, potassium, and phosphorus. However, the concentration of these elements may vary from species to species.
So, the correct answer is option C.
Question 6
1 / -0

Study the following combinations and identify the correct matches related to the role of essential mineral elements in plants.
(I) Sulphur - Stabilization of protein structure
(II) Manganese - Expression of apical dominance
(III) Zinc - Activation of IAA oxidase
(IV) Potassium - Maintenance of anion-cation balance in cells

A
(II), (III)

B
(II), (IV)

C
(I) , (IV)

D
(I) , (II)

Solution

The major role of sulphur in plants includes components of amino acids, aid in development of enzymes and vitamins, promotion of nodule formation on legumes, helps in the formation of chlorophyll. Thus, statement I is incorrect.
Manganese functions as a part of certain enzyme systems and helps in chlorophyll synthesis and helps in the expression of apical dominance. Thus, statement II is correct.
Zinc aids in activation of indole acetic acid oxidase. Thus, statement III is the right answer.
Potassium plays a major role in translocation of starches, enhancing photosynthesis, increasing water-use efficiency, helps in protein synthesis and fruit formation, activating enzymes and its regulation and increasing disease resistance. Thus, statement IV is wrong.
Thus, the correct answer is option A.
Question 7
1 / -0

How is Rhizobium useful to farmers?

A
They help in nitrogen fixation in the soil.

B
They help in killing pests.

C
They make the soil airy, soft and fertile.

D
They help in pulling out of weeds.

Solution

Rhizobium fixes nitrogen in symbiotic association with roots of leguminous plants. Initially, the bacteria grow in soil near the roots of higher plants where they fail to fix the nitrogen. These bacteria when coming in contact with leguminous plants, interact chemically and enter into roots through root hairs, and fix nitrogen by symbiotic association.
Thus, the correct answer is option A.
Question 8
1 / -0

A plant requires magnesium (Mg) for

A
Holding cells together.

B
Protein synthesis.

C
Chlorophyll synthesis.

D
Cell wall development.

Solution

In plants, magnesium is necessary for synthesis of chlorophyll and photosynthesis. Magnesium is bound as the central atom of the porphyrin ring of the green plant pigment chlorophyll. Magnesium is the element that causes plants to be able to convert light into energy. Hence, option C is correct.
Question 9
1 / -0

Nitrogen is

A
Not usual for plants.

B
Important for growth of plants and is taken by all plants from the air.

C
Important for growth of plants, but only some plants absorb the nitrogen from the air directly.

D
Important for growth of plants but no plant can absorb the nitrogen in the air directly.

Solution

Nitrogen is very important for plant growth. Plants do not get their nitrogen directly from the air. Although nitrogen is the most abundant element in the air, every nitrogen atom in the air is triple-bonded to another nitrogen atom to form molecular nitrogen, $$N_2$$.
Question 10
1 / -0

Excess of manganese inhibits the translocation of ________ to the shoot apex.

A
Calcium

B
Potassium

C
Copper

D
Molybdenium
Solution
Manganese is a micronutrient that is responsible for the photolytic evolution of oxygen in plants.
Excess manganese in the growth medium of the plant can interfere with the absorption, translocation, and utilization of other mineral elements such as calcium, magnesium, iron, and phosphorus.
So, the correct answer is 'Calcium'.

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Re-Attempt Weekly Quiz Competition

Mineral Nutrition Test - 46

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Mineral Nutrition Test - 46

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SHARING IS CARING

Question 1

Oxidation of ammonia to nitrite

Oxidation of nitrite to nitrate

Conversion of nitrogen to ammonia

All of these

Solution

Question 2

They turn nitrogen from the air into nitrogen compounds in the soil

They are essential for plants being able to carry out photosynthesis

They break up dead plants and animals in the soil

They release excess nitrogen from the soil into the atmosphere

Solution

Question 3

$$Mg$$ and $$P$$

$$Ca$$ and $$Mg$$

$$Zn$$ and $$Mg$$

$$Mn$$ and $$Cl$$

Solution

Question 4

Atmospheric carbon dioxide fixation

Atmospheric oxygen fixaton

Atmospheric nitrogen fixation

All of the above

Solution

Question 5

Na, K, and Ca

Na, P, and Mg

N, P and K

Mn, B and Mo

Solution

Question 6

(II), (III)

(II), (IV)

(I) , (IV)

(I) , (II)

Solution

Question 7

They help in nitrogen fixation in the soil.

They help in killing pests.

They make the soil airy, soft and fertile.

They help in pulling out of weeds.

Solution

Question 8

Holding cells together.

Protein synthesis.

Chlorophyll synthesis.

Cell wall development.

Solution

Question 9

Not usual for plants.

Important for growth of plants and is taken by all plants from the air.

Important for growth of plants, but only some plants absorb the nitrogen from the air directly.

Important for growth of plants but no plant can absorb the nitrogen in the air directly.

Solution

Question 10

Calcium

Potassium

Copper

Molybdenium

Solution

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