Mineral Nutrition Test

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Mineral Nutrition Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Hydroponics is

A
Nutrient less culture

B
Water less culture

C
Soilless culture

D
None of the above
Solution
Correct Option: C
Explanation:
Hydroponics means the culturing of plants without soil in water.
It is a Latin word which means 'working water'.
Cultivation of plants by placing the roots in the nutrient solution without any soil is called hydroponics.
It is a subset of hydroculture.
A solution of nutrients is prepared such that plants can thrive without soil.
Hence, also known as soilless culture.
Question 2
1 / -0

Which bacterium is capable of utilising the most abundantly available gas in the atmosphere for one of their metabolic pathways, but cannot utilise the second most abundantly available gas for another metabolic pathway?

A
Pseudomonas

B
Clostridium

C
Rhodomicrobium

D
Xanthomonas

Solution

Nitrogen is the most abundant while oxygen is the second most abundant gas in the atmosphere.
Rhodomicrobium is an anaerobic Nitrogen-fixing bacteria and hence can use nitrogen but not oxygen.
Xanthomonas and Pseudomonas are aerobic bacteria and use oxygen.
Clostridium is anaerobic bacteria but cannot fix nitrogen.
So the correct answer is 'Rhodomicrobium'.
Question 3
1 / -0

Nodules with nitrogen fixing bacteria are found in

A
Cotton

B
Gram

C
Mustard

D
Wheat

Solution

Nitrogen fixing bacteria Rhizobia are soil bacteria that established themselves in the nodules of legumes (Fabaceae). Plants that contribute to nitrogen fixation include grams, soyabeans, peanuts, etc.
Thus, the correct answer is option B.
Question 4
1 / -0

Biological Nitrogen fixers

a) Able to fix nitrogen into salts of nitrogen
b) Able to fix nitrogen into usable forms
c) Able to convert nitrogen into nitrates
d) Able to convert nitrogen into nitrates only

A
a, b, c

B
a, c

C
b, c

D
a, b

Solution

Some bacteria and cyanobacteria and able to fix atmosphere nitrogen into simple absorbable forms for plants.
Question 5
1 / -0

The total no. of electrons that take part in forming a bond in $$\displaystyle { N }_{ 2 }$$ is

A
2

B
4

C
6

D
10

Solution

Nitrogen does not exist in nacent form due to incomplete outermost octet. A triple bond is formed, when two atoms share 3 pairs of electrons (6 electrons) between them. In a nitrogen molecule there is a tripple bond between two nitrogen atoms as they share three pairs of electrons.
Question 6
1 / -0

Nitrogen is present in the environment as

(a) Ammonium ion (b) Nitrite ion (c) Nitrate ion (d) Nitrous oxide

A
a, b, c, d

B
a, b, c

C
b, c, d

D
None of these

Solution

Nitrogen is present in the environment in a wide variety of chemical forms including organic Nitrogen, ammonium $$(NH_{4}^{+})$$, nitrite, nitrate, nitrous oxide, nitric oxide etc.
Question 7
1 / -0

What word describes the relationship between the plant and the nitrogen fixing bacteria?

A
Parasitic

B
Carnivorous

C
Infection

D
Mutualistic, saprophytes

Solution

The symbiotic nitrogen fixing bacteria invade the root hairs of host plants, where they multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. Within the nodules the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
An organism which lives in or on another organism (its host) and benefits by deriving nutrients at the other's expense is known as parasitic organism like the nitrogen fixing bacteria in the host plant say legumes.
Question 8
1 / -0

Which is essential for root hair growth?

A
Zinc

B
Calcium

C
Molybdenum

D
Sulphur

Solution

Calcium helps in cell wall formation. It helps in root hair growth, which are needed for water absorption.
Question 9
1 / -0

Molybdenum causes

A
Mottling

B
Wilting

C
Reclamation

D
Chlorosis

Solution

Molybdenum (Mo) is essential to nitrate enzymes and for the formation of root nodules in beans and peas. Molybdenum deficiencies cause yellow mottling and dead spots on the leaves. In some plants, the growing tips are distorted or killed. Hence, option A is correct.
Question 10
1 / -0

Nitrogen is a cycle in which

A
Nitrogen compounds are broken

B
Nitrogen in converted into various forms

C
Decomposition occurs

D
All of the above
Solution
Correct Option: B

Explanation:
- The cycle in which the atmospheric nitrogen comes in the soil and living organisms and is released back into the atmosphere is called the nitrogen cycle.
- The main steps of nitrogen fixation are ammonification, nitrification and denitrification.
- Bacteria plays the important role in this cycle, providing different forms of nitrogen compounds assimilable by higher organisms.

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Mineral Nutrition Test - 45

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Mineral Nutrition Test - 45

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Question 1

Nutrient less culture

Water less culture

Soilless culture

None of the above

Solution

Question 2

Pseudomonas

Clostridium

Rhodomicrobium

Xanthomonas

Solution

Question 3

Cotton

Gram

Mustard

Wheat

Solution

Question 4

a, b, c

a, c

b, c

a, b

Solution

Question 5

2

4

6

10

Solution

Question 6

a, b, c, d

a, b, c

b, c, d

None of these

Solution

Question 7

Parasitic

Carnivorous

Infection

Mutualistic, saprophytes

Solution

Question 8

Zinc

Calcium

Molybdenum

Sulphur

Solution

Question 9

Mottling

Wilting

Reclamation

Chlorosis

Solution

Question 10

Nitrogen compounds are broken

Nitrogen in converted into various forms

Decomposition occurs

All of the above

Solution

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