Mineral Nutrition Test

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Mineral Nutrition Test - 59

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Weekly Quiz Competition

Question 1
1 / -0

Leguminous plants are able to fix atmospheric nitrogen through symbiotic activity. Which is not correct?

A
Leghaemoglobin scavenges oxygen and is pinkish in colour.

B
Nitrogenase is insensitive to oxygen.

C
Nodules act as sites for nitrogen fixation.

D
The enzyme nitrogenase catalyses the conversion of atmospheric nitrogen to ammonia.
Question 2
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Which one is a symbiotic nitrogen fixing plant?

A
Pinus

B
Azolla

C
Marchantia

D
Moss
Question 3
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What is the role of pseudomonas in nitrogen cycle?

A
Fixes elemental nitrogen

B
Produces elemental nitrogen

C
Transfers nitrogen

D
Changes ammonium nitrogen to nitrate state

Solution

The transformation of nitrates to nitrogen gas or nitrous oxide by certain microorganisms is called denitrification. Pseudomonas is a denitrifying bacteria.

So the correct option is "produces elemental nitrogen".
Question 4
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How does the nitrogen fixation occur in legumes?

A
By specialized bacteria in their roots

B
By specialized bacteria in their leaves

C
Independent of bacteria that live in them

D
Not by any of the above methods

Solution

Nitrogen fixation is the conversion of atmospheric nitrogen into nitrates and ammonia by nitrogen-fixing bacteria which are associated with the roots of the legume plants.
Examples of nitrogen fixing bacteria includes Rhizobium
So, the correct answer is 'By specialized bacteria in their roots'
Question 5
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Nitrogen fixation is the conversion of

A
Nitrogen $$\rightarrow$$ Ammonia

B
Nitrogen $$\rightarrow$$ Nitrates

C
Nitrogen $$\rightarrow$$ Amino acids

D
Both A and B

Solution

Nitrogen fixation is conversion of atmospheric nitrogen into nitrates and ammonia by nitrogen fixing bacteria.
So, the correct answer is both A and B.
Question 6
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Azotobacter and Bacillus polymyxa are

A
Decomposers

B
Non-symbiotic nitrogen fixers

C
Symbiotic nitrogen fixers

D
Pathogenic bacteria

Solution

Azotobacter and Bacillus polymyxa are non-symbiotic nitrogen fixers.
Rhizobium is an example for symbiotic nitrogen fixer.
Staphylococcus aureus, Sreptococcus pyogenes are pathogenic bacteria.
Fungi are classical examples of decomposers.
So, the correct answer is 'Non-symbiotic nitrogen fixers'
Question 7
1 / -0

Which of the following is correct?

A
Legumes fix nitrogen through bacteria in their leaves.

B
Legumes fix nitrogen through bacteria in their roots.

C
Legumes fix nitrogen independent of bacteria.

D
Legumes do not fix nitrogen.

Solution

Nitrogen fixation is accomplished with the help of nitrogen-fixing microbes, mainly Rhizobium. The enzyme nitrogenase plays an important role in biological nitrogen fixation and is very sensitive to oxygen. Nodule formation involves a sequence of multiple interactions between Rhizobium and roots of host plant.
So, the correct answer is 'legumes fix nitrogen through bacteria in their roots'
Question 8
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Which one of the following cannot fix nitrogen?

A
Nostoc

B
Azotobacter

C
Spirogyra

D
Anabaena
Solution
- Spirogyra is a green alga that can perform photosynthesis. It does not fix nitrogen.
- Free-living nitrogen-fixers include the cyanobacteria Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.
So, the correct answer is option C.
Question 9
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'Nif' gene for nitrogen fixation in cereal crops like wheat, jowar etc. is introduced by cloning

A
Rhizobium meliloti

B
Bacillus thuringiensis

C
Rhizopus stolonifer

D
Agrobacterium tumefaciens

Solution

Answer is option A i.e. "Rhizobium meliloti"
"Nif" genes encoding enzymes needed for nitrogen fixation i.e. nitrogenase enzyme complex. It is used in cereal crops like wheat, jowar etc. and introduced by cloning of nitrogen fixing bacteria like Rhizobium meliloti.
Question 10
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Example of an ammonifying bacteria is

A
Clostridium

B
Azotobacter

C
Nitrosococcus

D
Bacillus ramosus

Solution

Ammonifying microorganisms example are
1) Bacillus ramosus
2) B.vulgaris
3) Clostridium
4) Actinomycetes etc

So the correct option is "Bacillus ramosus".

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Re-Attempt Weekly Quiz Competition

Mineral Nutrition Test - 59

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Mineral Nutrition Test - 59

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SHARING IS CARING

Question 1

Leghaemoglobin scavenges oxygen and is pinkish in colour.

Nitrogenase is insensitive to oxygen.

Nodules act as sites for nitrogen fixation.

The enzyme nitrogenase catalyses the conversion of atmospheric nitrogen to ammonia.

Question 2

Pinus

Azolla

Marchantia

Moss

Question 3

Fixes elemental nitrogen

Produces elemental nitrogen

Transfers nitrogen

Changes ammonium nitrogen to nitrate state

Solution

Question 4

By specialized bacteria in their roots

By specialized bacteria in their leaves

Independent of bacteria that live in them

Not by any of the above methods

Solution

Question 5

Nitrogen $$\rightarrow$$ Ammonia

Nitrogen $$\rightarrow$$ Nitrates

Nitrogen $$\rightarrow$$ Amino acids

Both A and B

Solution

Question 6

Decomposers

Non-symbiotic nitrogen fixers

Symbiotic nitrogen fixers

Pathogenic bacteria

Solution

Question 7

Legumes fix nitrogen through bacteria in their leaves.

Legumes fix nitrogen through bacteria in their roots.

Legumes fix nitrogen independent of bacteria.

Legumes do not fix nitrogen.

Solution

Question 8

Nostoc

Azotobacter

Spirogyra

Anabaena

Solution

Question 9

Rhizobium meliloti

Bacillus thuringiensis

Rhizopus stolonifer

Agrobacterium tumefaciens

Solution

Question 10

Clostridium

Azotobacter

Nitrosococcus

Bacillus ramosus

Solution

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