Mineral Nutrition Test

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Mineral Nutrition Test - 84

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Weekly Quiz Competition

Question 1
1 / -0

In feedback inhibition, a metabolic pathway is switched off by

A
Lack of a substrate

B
Accumulation of the end product

C
A rise in temperature

D
Competitive inhibition

Solution

Accumulation of the end product triggers inhibition or switching off of the metabolic pathway in feedback inhibition mechanism.
So, the correct option is 'Accumulation of the end product'.
Question 2
1 / -0

Which one of the following organisms does not have the ability to fix atmospheric nitrogen?

A
Nostoc

B
Ulothrix

C
Rhizobium

D
Azotobacter

Solution

Nitrogen assimilation is the formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds present in the environment. Organisms like plant, fungi and certain bacteria that cannot fix nitrogen gas depend on the ability to assimilate nitrate or ammonia for their needs.
So, the correct option is 'Ulothrix'.
Question 3
1 / -0

'Nif' gene for nitrogen fixation in cereal crops like wheat, jowar etc., is introduced by cloning

A
Rhizobium melloti

B
Bacillus thuringiensis

C
Rhizopus stolonifer

D
Agrobacterium tumefaciens.

Solution

'Nif' genes are genes encoding enzymes involved in the fixation of atmospheric nitrogen into a form of nitrogen available to living organisms. The primary enzyme is encoded by nif gene is the nitrogenase complex which is in charge of converting atmospheric nitrogen to ammonia. It is used in cereal crops like wheat, jowar etc. and introduced by cloning of nitrogen fixing bacteria like Rhizobium meliloti.
So, the correct option is 'Option A' .
Question 4
1 / -0

Pollen grains that would easily germinate on stigma are found to germinate in vitro, only when $$10-200$$ ppm of boric acid is added. This suggest that

A
Boron accelerates protein synthesis in pollen grain

B
Boron has an abrasive effect on the exine

C
Boric acid serves as a solvent for sporopollenins

D
Pollen wall is boron deficient and high levels of boron occur in the style and stigma

Solution

During in vitro pollen grain germination among inorganic substances, boron, in the form of boric acid or borate, has most dramatic effect on pollen germination and pollen tube growth. Pollen of most species are deficient in boron content. In nature, this deficiency is made up by comparatively high levels of boron in the stigma and style. When such pollen grains are grown in vitro high amounts of boron$$(10-200$$pp$$)$$ are supplied exogenously. Boron reduces bursting of pollen tubes as well as enhances percentage germination and pollen tube growth. Some of the role attribute to boron are
(i) Effect on water relationship and, thus, preventing pollen tube bursting.
(ii) Translocation of sugars.
(iii) Direct of indirect influence on enzymatic steps in the biosynthesis of carbohydrates.

So, the correct answer is 'Pollen wall is boron deficient and high levels of boron occur in the style and stigma'.
Question 5
1 / -0

Three features of nitrogenous excretory products (M, N and O) of animals are tabulated given.
Features of excretory products M N O
Toxicity High Very low Low
Energy cost to produce Low Moderate High
Water loss to excretion High Moderate Low

The animals that secrete M, N and O as their major excretory product would be

A
M: human, N: pigeon, O: tadpole

B
M: cockroach, N: cat, O: snake

C
M: crow, N: lizard, O: dog

D
M: goldfish, N: rat, O: lizard

Solution

Excretory product of goldfish is ammonia. Excretory product of rat is urea. Excretory product of lizard is uric acid. Ammonia is highly toxic when compared to urea or uric acid. Hence, urea is least toxic. Ammonia is easy to produce. Conversion of ammonia into uric acid results in high energy cost, Energy cost to produce urea from ammonia is moderate when compared to cost of production of uric acid. Ammonia is more water soluble as compared to uric acid and urea. Hence, water loss to excretion is very high in it. Urea is more water soluble than uric acid. Hence, water loss to excretion will be moderate in rat and low in lizard.
Thus, the correct answer is option D.
Question 6
1 / -0

The given experimental set-up is used

A
To show that $$CO_2$$ is required during photosynthesis

B
To show that $$O_2$$ is evolved during photosynthesis

C
for nutrient solution culture

D
to measure growth of a plant.

Solution

The given experimental set-up shows nutrient solution culture. In this typical solution culture technique, nutrient solution is placed in superior glass jars or polythene bottles covered with black paper (to prevent growth of algae and reaction of roots to sunlight). The jars contain split covers or corks with holes for suspending seeding, a funnel for adding solution and a bent tube for aeration, as shown in the given figure. Regular aeration is required for proper growth and activities of roots.
So, the correct answer is 'For nutrient solution culture'.
Question 7
1 / -0

Choose the correct option for the mechanism of enzyme action.

A

E + S $$\rightleftharpoons$$ ES $$\rightarrow$$ EP $$\rightleftharpoons$$ E+P

B
E + S $$\rightarrow$$ EP

C
E + S $$\rightleftharpoons$$ ES $$\rightleftharpoons$$ E+P

D
Both A and C
Solution
The active site of enzymes has a specific conformation for attracting and holding substrate. It usually possesses a service where the substrate fits in a complementary fashion. The two join to form a complex, i.e., enzyme-substrate complex.
The complex state is short-lived. The substrate change into products. The products remain complexed with the active site of the enzyme for a short period. They soon separate and the active site is released to perform another catalytic act.
So, the correct option is A.
Question 8
1 / -0

Which of the following statement is correct?

A
Calcium inhibits the transiocation of manganese in shoot apex

B
Calcium deficiency is first reported in old leaf

C
In grasses, $$Si$$ provided the mechanical strength

D
Nitrogenases catalyse the conversion of $$NH_3$$ to $$N_2$$
Question 9
1 / -0

Which of the following is not an aerobic nitrogen fixing free living bacteria?

A
Azospirillum

B
Azotobacter

C
Beijerinickia

D
Chromatium

Solution

Azospirillium is Gram-negative, aerobic nitrogen-fixing bacteria.
Azotobacter is aerobic and free-living nitrogen-fixing bacteria.
Beijerinckia is a free-living aerobic nitrogen-fixing organism.
Chromatium is gram-negative bacteria found in water which is anaerobic nitrogen fixer.
So, the correct answer to this question is 'Chromatium'.
Question 10
1 / -0

Which of the following is a characteristics of Frankia?

A
Free-living in soil, but symbiotic for atmospheric nitrogen fixation.

B
Produces nodules on the roots of leguminous plants.

C
Found in association with Rhizobium.

D
Is pathogenic to plants.
Solution
- Frankia belongs to actinomycetes in the family Frankiaceae that fix nitrogen, both under symbiotic and free-living aerobic conditions.
- Both Rhizobium and Frankia form root nodules but Frankia forms in actinorhizal plants and Rhizobium forms in leguminous plants. Rhizobium is aerobic.
So, the correct answer is option A.

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Features of excretory products	M	N	O
Toxicity	High	Very low	Low
Energy cost to produce	Low	Moderate	High
Water loss to excretion	High	Moderate	Low

Mineral Nutrition Test - 84

Result

Mineral Nutrition Test - 84

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SHARING IS CARING

Question 1

Lack of a substrate

Accumulation of the end product

A rise in temperature

Competitive inhibition

Solution

Question 2

Nostoc

Ulothrix

Rhizobium

Azotobacter

Solution

Question 3

Rhizobium melloti

Bacillus thuringiensis

Rhizopus stolonifer

Agrobacterium tumefaciens.

Solution

Question 4

Boron accelerates protein synthesis in pollen grain

Boron has an abrasive effect on the exine

Boric acid serves as a solvent for sporopollenins

Pollen wall is boron deficient and high levels of boron occur in the style and stigma

Solution

Question 5

M: human, N: pigeon, O: tadpole

M: cockroach, N: cat, O: snake

M: crow, N: lizard, O: dog

M: goldfish, N: rat, O: lizard

Solution

Question 6

To show that $$CO_2$$ is required during photosynthesis

To show that $$O_2$$ is evolved during photosynthesis

for nutrient solution culture

to measure growth of a plant.

Solution

Question 7

E + S $$\rightleftharpoons$$ ES $$\rightarrow$$ EP $$\rightleftharpoons$$ E+P

E + S $$\rightarrow$$ EP

E + S $$\rightleftharpoons$$ ES $$\rightleftharpoons$$ E+P

Both A and C

Solution

Question 8

Calcium inhibits the transiocation of manganese in shoot apex

Calcium deficiency is first reported in old leaf

In grasses, $$Si$$ provided the mechanical strength

Nitrogenases catalyse the conversion of $$NH_3$$ to $$N_2$$

Question 9

Azospirillum

Azotobacter

Beijerinickia

Chromatium

Solution

Question 10

Free-living in soil, but symbiotic for atmospheric nitrogen fixation.

Produces nodules on the roots of leguminous plants.

Found in association with Rhizobium.

Is pathogenic to plants.

Solution

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