Mineral Nutrition Test

Result

Mineral Nutrition Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

Which is a free living nitrogen fixing bacterium?

A
Pseudomonas

B
Azotobacter

C
Nitrosomonas

D
Rhizobium

Solution

Reduction of inert atmospheric nitrogen to ammonia by living organisms is called biological nitrogen-fixation. Only certain prokaryotic organisms (some bacteria and cyanobacteria) are capable of fixing $$N_2$$. Such microbes are called $$N_2$$-fixers. These $$N_2$$-fixing microbes contain an exclusive enzyme, Nitrogenase that is capable of reducing nitrogen.
Azotobacter is the free-living $$N_2$$-fixing bacteria. It is aerobic i.e., it requires oxygen for respiration.
Question 2
1 / -0

An element essential as electron carrier is

A
Potassium

B
Zinc

C
Calcium

D
Iron

Solution

Iron has the major function of electron transport in respiration and photosynthesis. It is present in cytochrome and ferredoxin which are the main electron carrier and transport electrons by the oxidation-reduction process during the respiration and photosynthesis respectively.
Thus, the correct answer is option D.
Question 3
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Necrosis of tissue, particularly leaf tissue is due to deficiency of

A
N, K, Mg, Fe, Mn, Zn and Mo

B
Ca, Mg, Cu and K

C
N, K and S

D
N, K, Mg and Fe

E
Mn, Zn and Mo

Solution

The concentration of the essential element below which plant growth is retarded is termed as critical concentration. The element is said to be deficient when present below the critical concentration. Since each element has one or more specific structural or functional role in plants, so plants certain morphological changes in the limitation of any particular element. These externally visible morphological change which are produced due to absence or deficiency of essential mineral elements, are called deficiency symptoms. Necrosis is a common deficiency symptom. It refers to the death of tissue, particularly leaf tissue. It is caused by the deficiency of Ca, Mg, Cu and K.
Question 4
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Appearance of brown spots surrounded by chlorotic veins is a toxicity symptom of

A
Mo

B
Mn

C
Mg

D
Zn
Solution
Micronutrients are always required in low amounts. Their moderate decrease in the soil causes deficiency symptoms. However, a moderate increase in their concentration can cause toxicity as there is a narrow range of concentration at which the elements are optimum. Any mineral ion concentration in tissues that reduces the dry weight of tissues by about ten percent is considered to be toxic concentration. Appearance of brown spots surrounded by chlorotic veins is a toxicity symptom of Mn. Excess of Mn cause:
Reduction in uptake of Mg and Fe.
Prevention of binding of Mg with enzymes.
Inhibition of Ca translocation to shoot apex.
Question 5
1 / -0

Hydroponics is growing plants

A
Without soil

B
Without organic matter

C
In water

D
All the above

Solution

Culturing of plants in soil less medium is called hydroponics. Plants are raised in small tanks filled with a solution containing appropriate quantities of all mineral elements. The solution is changed from time to time. It has a mechanism for aeration and circulation. Iron is added as Fe-EDTA otherwise it gets precipitated. EDTA is a chelating agent which keeps the metal ion in the soluble state. There is no need of organic matter. Hydroponics is useful in areas having thin, infertile and dry soils. Through this technique out of season fruits and vegetables can also be grown.
Thus the correct option is D.
Question 6
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Mo is part of .............. enzyme.

A
Reverse transcriptase

B
Restriction endonuclease

C
Hexokinase

D
Nitrogenase

Solution

Reduction of inert atmospheric nitrogen to ammonia by living organisms is called biological nitrogen-fixation. Only certain prokaryotic organisms (some bacteria and cyanobacteria) are capable of fixing $$N_2$$. Such microbes are called $$N_2$$-fixers. These $$N_2$$-fixing microbes contain an exclusive enzyme, Nitrogenase that is capable of reducing nitrogen. This enzyme is required to fix atmospheric nitrogen ($$N\equiv N$$). It is made up of Mo-Fe protein. It catalyses the conversion of atmospheric nitrogen to ammonia.
Question 7
1 / -0

Which of the following bacterium causes denitrification?

A
Azotobacter

B
Nitrobacter

C
Nitrosomonas

D
Pseudomonas

Solution

Some of the nitrates present in the soil is reduced to gaseous nitrogen by the action of microorganisms. This process is called denitrification.
Denitrification is caused by bacteria Pseudomonas denitrificans and Thiobacillus denitrificans.
$$2NO_3^- \rightarrow 2NO_2^- \rightarrow 2NO \rightarrow N_2O \rightarrow N_2$$
The released N_2 escapes into the atmosphere.
Question 8
1 / -0

The element which is a part of the ring structure of chlorophyll and maintenance of ribosome structure is?

A
K

B
S

C
Mg

D
Ca

Solution

Magnesium is an essential mineral element. It is one of the macronutrients. It is a part of the ring structure of chlorophyll. A non-ionic magnesium is held in the centre of porphyrin head by nitrogen atoms of pyrrole rings. Mg is also responsible for the maintenance of ribosome structure. Ribosome has two subunits. $$Mg^+$$ is required for the binding of these two subunits.
Question 9
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Match and find the correct combination.
(a) Mg (i) Splitting of water during photosynthesis
(b) Mo (ii) Germination of pollen grain
(c) Mn (iii) Constituent of chlorophyll
(d) B (iv) Component of nitrate reductase
(v) Synthesis of auxin

A
a-ii, b-v, c-iv, d-i

B
a-iii, b-iv, c-ii, d-i

C
a-iii, b-v, c-iv, d-i

D
a-iii, b-iv, c-i, d-ii

Solution

Mg is constituent of chlorophyll and present at the centre of the ring structure.
Mo is present in nitrate reductase with iron.
Mn helps in splitting of water during the photosynthesis in the presence of the oxygen-evolving complex.
B is required for pollen germination.
Thus, the correct answer is option D.
Question 10
1 / -0

Which of the following microbes produces nitrogen fixing nodules in non leguminous plants?

A
Rhizobium

B
Frankia

C
Azotobacter

D
Pseudomonas

Solution

Several bacteria produce small outgrowths (spherical) on the surface of legume roots, called as nodules. Rhizobium produces nitrogen fixing nodules in leguminous plants. But, Frankia also produces nitrogen-fixing nodules on the roots of non-leguminous plants (e.g. Alnus). Frankia is free-living in the soil, but can fix atmospheric nitogen as symbionts.

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Re-Attempt Weekly Quiz Competition

(a) Mg	(i) Splitting of water during photosynthesis
(b) Mo	(ii) Germination of pollen grain
(c) Mn	(iii) Constituent of chlorophyll
(d) B	(iv) Component of nitrate reductase
	(v) Synthesis of auxin

Mineral Nutrition Test - 18

Result

Mineral Nutrition Test - 18

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Rank

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Question 1

Pseudomonas

Azotobacter

Nitrosomonas

Rhizobium

Solution

Question 2

Potassium

Zinc

Calcium

Iron

Solution

Question 3

N, K, Mg, Fe, Mn, Zn and Mo

Ca, Mg, Cu and K

N, K and S

N, K, Mg and Fe

Mn, Zn and Mo

Solution

Question 4

Mo

Mn

Mg

Zn

Solution

Question 5

Without soil

Without organic matter

In water

All the above

Solution

Question 6

Reverse transcriptase

Restriction endonuclease

Hexokinase

Nitrogenase

Solution

Question 7

Azotobacter

Nitrobacter

Nitrosomonas

Pseudomonas

Solution

Question 8

K

S

Mg

Ca

Solution

Question 9

a-ii, b-v, c-iv, d-i

a-iii, b-iv, c-ii, d-i

a-iii, b-v, c-iv, d-i

a-iii, b-iv, c-i, d-ii

Solution

Question 10

Rhizobium

Frankia

Azotobacter

Pseudomonas

Solution

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