Mineral Nutrition Test

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Mineral Nutrition Test - 75

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Question 1
1 / -0

In the root nodules of leguminous plants, the pigment, necessary for nitrogen fixation is?

A
Haemoglobin

B
Leghaemoglobin

C
Chlorophyll

D
Xanthophyll

Solution

The pigment Leghaemoglobin is present in the root nodules, it provides an anaerobic environment for the functioning of the Nitrogen fixing enzyme Nitrogenase.
So, the correct answer is 'Leghaemoglobin'
Question 2
1 / -0

Low concentrations of which of the following elements will lead to delay in flowering?

A
$$K, N, Mg$$

B
$$Mg, Zn, Mo$$

C
$$N, S, Mo$$

D
$$K, Zn, S$$

Solution

Flowering occurs after the completion of the vegetative phase.
Nitrogen deficiency leads to impaired production of proteins, enzymes, etc leading to stunted growth, dormancy of lateral buds, and flowering.
Sulphur deficiency results in pale yellow coloration in all parts of the plants. It prevents flowering, if flowering occurs the number is reduced and is shed prematurely.
Molybdenum deficiency results in restricted flower production and setting of fruit.
So, the correct answer is 'N,S,Mo'.
Question 3
1 / -0

How is it possible to get a rough idea of the deficiency of an essential element in the soil without doing soil tests?

A
Only by making detailed analysis of the ash of a plant growing in it.

B
By noting the typical symptoms of deficiency shown by plant growing in it.

C
By observing the physical texture of the soil.

D
By determining the dry weight of the plant.

Solution

Plants obtain minerals from soil. If a mineral is deficient in soil, then it will be deficient in plants growing on that soil. However, plant deficiency symptom are difficult to interpret because usually a deficiency symptom may be caused due to deficiency of several mineral elements. Also deficiency of a single mineral element may give rise to multiple symptoms in plants. Also the deficiency symptoms vary from plant to plant and also vary with the age and other physiological variations. Hence, detailed analysis of plant ash can only reveal the nature of deficient mineral in a plant (and hence soil).
Question 4
1 / -0

The association between ants and membrane of family rubiaceae is

A
Ornithophily

B
Entomophily

C
Myrmecophily

D
Anemophily

Solution

The ants obtain food and shelter from the plant and they protect the plant from other animals.
Question 5
1 / -0

Minerals required for synthesis of chlorophyll molecule are

A
Ca and K

B
Fe and Mg

C
Mn and K

D
Ca and Mg

Solution

Chlorophylls have a cyclic tetrapyrrole porphyrin head to which a long phytol tail is attached. The cyclic tetrapyrrole has an atom of magnesium coordinated in the centre. The chlorophyll is synthesized from protochlorophyllide on exposure to light. The synthesis of protochlorophyllide requires iron. Hence, the correct answer is the option B.

Question 6

1 / -0

Match the following.

(A) Nitrobacter	(i) Free living aerobic nitrogen fixing organism
(B) Clostridium	(ii) Converts nitrite to nitrates
(C) Nitrosococcus	(iii) Converts ammonia to nitrite
(D) Azotobacter	(iv) Free living anaerobic nitrogen fixing organism

A- (iii), B- (iv), C- (ii), D- (i)

A- (i), B- (ii), C- (iii), D- (v)

A- (ii), B- (iv), C- (iii), D- (i)

A- (iv), B- (ii), C- (i), D- (iii)

Solution

Nitrobacter plays an important role in the nitrogen cycle. They oxidize nitrite to nitrate in the soil. Nitrobacter uses energy from the oxidation of nitrite ions (NO$$_2$$-), into nitrate ions (NO$$_3$$-), to fulfill their energy needs. Clostridium is obligate anaerobe that cannot tolerate oxygen even if they are not fixing nitrogen. They live in habitats low in oxygen, such as soils and decaying vegetable matter. The last step in the process of aerobic ammonia oxidation is carried out by groups of nitrifying bacteria such as Nitrosococcus which convert ammonia to nitrite. Azotobacter is aerobic, free-living soil microbe which binds atmospheric nitrogen, which is inaccessible to plants and releasing it in the form of ammonium ions into the soil.

Question 7
1 / -0

Which of these plants require vanadium for its growth?

A
Aspergillus fungus

B
Astragalus

C
Legume plants

D
Scenedesmus algae

Solution

There is evidence that in addition to C, H, O following mineral nutrients are required by one or more algae - N, P, K, Mg, Ca, S , Fe, Cu, Mn, Zn, Mo, Na, Co, V, Si, Cl, B and I.
Vanadium is essential for the growth of Scenedesmus obliquus, in which it is involved in photosynthesis.
So, the correct answer is 'Scenedesmus algae'
Question 8
1 / -0

The main constituents of cytoplasm is C, N, O, H. These are derived from-

A
Protein

B
Carbohydrate

C
Water

D
None of these.
Question 9
1 / -0

Which of the following red pigment is associated with bacteria, Rhizobium?

A
Phycoerythrin

B
Phycocyanin

C
Leghaemoglobin

D
Bacterioviridin

Solution

Leghaemoglobin is a red coloured haemoprotein found in the nitrogen-fixing root nodules of leguminous plants. It is produced by legumes in response to the roots being colonized by nitrogen-fixing bacteria, termed rhizobia.
Question 10
1 / -0

The absorbed phosphorous is often stored in vegetative tissues and seeds in form of

A
$$H_2PO_4$$

B
$$PO_4$$

C
Phytin

D
$$HPO_4^{2-}$$

Solution

Phosphorous is an essential macronutrient for plants. It is required for biosynthesis of nucleotides and nucleic acids and other energy transfer reactions. Phytin is a calcium magnesium salt of phytic acid, that occurs in plants as the main phosphorus storage reserve especially in seeds or tubers.

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Mineral Nutrition Test - 75

Result

Mineral Nutrition Test - 75

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SHARING IS CARING

Question 1

Haemoglobin

Leghaemoglobin

Chlorophyll

Xanthophyll

Solution

Question 2

$$K, N, Mg$$

$$Mg, Zn, Mo$$

$$N, S, Mo$$

$$K, Zn, S$$

Solution

Question 3

Only by making detailed analysis of the ash of a plant growing in it.

By noting the typical symptoms of deficiency shown by plant growing in it.

By observing the physical texture of the soil.

By determining the dry weight of the plant.

Solution

Question 4

Ornithophily

Entomophily

Myrmecophily

Anemophily

Solution

Question 5

Ca and K

Fe and Mg

Mn and K

Ca and Mg

Solution

Question 6

A- (iii), B- (iv), C- (ii), D- (i)

A- (i), B- (ii), C- (iii), D- (v)

A- (ii), B- (iv), C- (iii), D- (i)

A- (iv), B- (ii), C- (i), D- (iii)

Solution

Question 7

Aspergillus fungus

Astragalus

Legume plants

Scenedesmus algae

Solution

Question 8

Protein

Carbohydrate

Water

None of these.

Question 9

Phycoerythrin

Phycocyanin

Leghaemoglobin

Bacterioviridin

Solution

Question 10

$$H_2PO_4$$

$$PO_4$$

Phytin

$$HPO_4^{2-}$$

Solution

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