Mineral Nutrition Test

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Mineral Nutrition Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Necrosis mainly occurs by the deficiency of

A
Ca, Mg

B
N, S

C
Mn, Mo

D
Fe, Mn
Question 2
1 / -0

Which essential element is found in haemoglobin, porphyrins and cytochromes?

A
Magnesium

B
Manganese

C
Copper

D
Iron

Solution

Iron plays important role in biology in haemoglobin, porphyrins forming complexes with molecular oxygen and cytochromes .
So, the correct option is D. ( Iron )
Question 3
1 / -0

The ability of coralloid roots to fix atmospheric nitrogen is due to the presence of

A
Blue-green algae

B
Mycorrhiza

C
Rhizobium

D
None of these

Solution

Cyanobacteria within the coralloid roots of Cycads are chemoheterotrophic and specifically adapted to life in symbiosis. Not all cyanobacteria live in symbiosis, and only a few species form associations with Cycads. All Cyanobacteria in symbiosis with Cycads have the ability to fix nitrogen. So, the correct option is "A" (Blue-green algae).
Question 4
1 / -0

Azolla pinata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of :

A
$$N_2$$ fixing bacteria

B
$$N_2$$ fixing cyanobacteria

C
Mycorrhizae

D
All of these

Solution

Azolla pinata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of a $$N_2$$ fixing cyanobacteria named Anabaena.
So, the correct option is '$$N_2$$ fixing cyanobacteria'
Question 5
1 / -0

The deficiency of which of the following micronutrients causes the death of the stem and root apices?

A
Manganese

B
Copper

C
Calcium

D
Zinc
Question 6
1 / -0

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?

A
Sulphur

B
Magnesium

C
Nitrogen

D
Potassium

Solution

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element sulphur is relatively immobile. So, the correct answer is "Sulphur."
Question 7
1 / -0

You observed that a plant's younger leaves, not the older ones, are yellowing. You recall that the cause of plant sickness can be diagnosed by which leaves are yellowing.
What is the most likely cause of your plant's blight?

A
Too much shade

B
Lack of nitrogen-fixing Rhizobium bacteria

C
A deficiency in a mobile mineral nutrient.

D
A deficiency in a non-mobile mineral nutrient.

Solution

If there is a deficiency of mobile nutrients, the symptoms are first seen in the leaves. Mobile and immobile nutrients refer to the transportability of these (K), (Mg), (Cl), (Zn) and (Mo).
So, the correct option is 'A deficiency in a non-mobile mineral nutrient'.
Question 8
1 / -0

Which of the following is a primary nutrients?

A
Boron

B
Calcium

C
Sulphur

D
Nitrogen

Solution

Primary nutrients of Macro-elements for plant growth and development are essential elements performing a various metabolic process in plant cell such as permeability of cell membrane, buffering action, enzymatic activity to name some. NPK i.e., Nitrogen, Phosphorus and Potassium are primary nutrients.
Thus, correct answer of following is Option D. and all other given options are Micro-nutrients for plant growth
So, the correct answer is 'Nitrogen'
Question 9
1 / -0

In plants, iron is absorbed in the form of ..........

A
$${ Fe }^{ + }$$

B
$${ Fe }^{ 2+ }$$

C
$${ Fe }^{ 3+ }$$

D
$${ Fe }^{ 4+ }$$

Solution

Plants absorb iron from the soil in the form of ferric ions (Fe$$^+$$$$^3$$)
Thus the correct option is 'C'.
Question 10
1 / -0

If, by radiation, all nitrogenase enzyme are inactiveted, then there will be no

A
Fixation of nitrogen in legumes

B
Fixation of atmospheric nitrogen

C
Conversion from nitrate to nitrate in legumes

D
Conversion from ammonium to nitrate in soil

Solution

If by radiation all nitrogenase enzyme is inactivated, then there will be no fixation of nitrogen in legumes. The enzyme nitrogenase is necessary for biological nitrogen fixation only. If it gets inactivated by radiation, the process of biological nitrogen fixation will get affected. Nitrogen fixation occurs through other ways also. So either phenomenon of nitrogen fixation will not stop by the absence of nitrogenase enzyme.
Neither conversion of ammonium to nitrate(nitrification) nor conversion of nitrate to nitrite require nitrogenase. Hence they will not get affected.

So, the correct answer is 'Fixation of nitrogen in legumes'.

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Re-Attempt Weekly Quiz Competition

Mineral Nutrition Test - 20

Result

Mineral Nutrition Test - 20

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SHARING IS CARING

Question 1

Ca, Mg

N, S

Mn, Mo

Fe, Mn

Question 2

Magnesium

Manganese

Copper

Iron

Solution

Question 3

Blue-green algae

Mycorrhiza

Rhizobium

None of these

Solution

Question 4

$$N_2$$ fixing bacteria

$$N_2$$ fixing cyanobacteria

Mycorrhizae

All of these

Solution

Question 5

Manganese

Copper

Calcium

Zinc

Question 6

Sulphur

Magnesium

Nitrogen

Potassium

Solution

Question 7

Too much shade

Lack of nitrogen-fixing Rhizobium bacteria

A deficiency in a mobile mineral nutrient.

A deficiency in a non-mobile mineral nutrient.

Solution

Question 8

Boron

Calcium

Sulphur

Nitrogen

Solution

Question 9

$${ Fe }^{ + }$$

$${ Fe }^{ 2+ }$$

$${ Fe }^{ 3+ }$$

$${ Fe }^{ 4+ }$$

Solution

Question 10

Fixation of nitrogen in legumes

Fixation of atmospheric nitrogen

Conversion from nitrate to nitrate in legumes

Conversion from ammonium to nitrate in soil

Solution

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