Reduction of nitrogen to ammonia by living organisms is called as

(1) Electrical Nitrogen Fixation

(2) Biological Nitrogen Fixation

(3) Industrial Nitrogen Fixation

(4) Both B and C

Subtopic:  Nitrogen Metabolism: 1 | Nitrogen Metabolism:2 | Nitrogen metabolism | Nitrogen Metabolism |
 77%
From NCERT
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Which of the following enzyme is exclusively in prokaryotes?

(1) Nitrogenase

(2) Pyruvate kinase

(3) Glucokinase

(4) Enolase

Subtopic:  Nitrogen Fixation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
 93%
From NCERT
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Nitrogenase converts

(1) Nitrate to Nitrite

(2) Nitrogen to Ammonia

(3) Nitrogen to Nitrite

(4) Nitrogen to Nitrate

Subtopic:  Nitrogen Fixation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
 81%
From NCERT
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Which of the following is symbiotic nitrogen fixer?

1. Glomus

2. Azotobacter

3. Frankia

4. Azolla

Subtopic:  Nitrogen Fixation |
From NCERT
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Which of the following is free living nitrogen fixing cyanobacteria?

(1) Anabaena

(2) Azotobacter

(3) Beijernickia

(4) Rhodospirillum

Subtopic:  Nitrogen Fixation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
 80%
From NCERT
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Rhizobium

(1) Rod shaped

(2) Legume-bacteria relationship

(3) Has relationship with roots of several legumes such as alfalfa, sweet clover sweet pea, Lentils, garden Pea, broad bean and clover beans

(4) All of these

Subtopic:  Nitrogen Fixation |
 96%
From NCERT
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The most common association on roots is as

(1) Lichens

(2) Nodules

(3) Beads

(4) Pneumathodes

Subtopic:  Nitrogen Fixation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
 90%
From NCERT
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Rhizobium and Frankia

(1) Free living in soil

(2) Act as symbiont and fix nitrogen

(3) One is found on the roots of non-leguminous plants

(4) All of these

Subtopic:  Nitrogen Fixation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
 86%
From NCERT
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The central portion of nodule is pink in color due to

(1) Leg- haemoglobin

(2) Haemoglobin

(3) RBC

(4) Myoglobin

Subtopic:  Nitrogen Fixation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
 97%
From NCERT
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These are the events of Nodule formation:
a. Rhizobia get attached to epidermal and root hair.
b. Rhizobia multiply and colonise the surroundings of roots
c. Bacteria invade the root hair
d. The root hairs curl
e. An infection thread is produced
f. Bacteria are released from the thread into the cells
g. Infection thread carries the bacteria into the cortex of the root
h. The release of bacteria into cortex leads to the differentiation of specialised nitrogen fixing cells
i. Establishment of a direct vascular connection with the host for exchange
j. Nodule is formed finally
k. Initiation of nodule formation in the cortex of the root
Arrange them in order.
1. b-a-d-c-e-g-f-k-i-h-j
2. b-a-c-d-g-e-f-k-h-j-i
3. b-a-d-c-e-g-k-f-h-j-i
4. a-b-c-d-e-g-k-f-j-i-h

Subtopic:  Nitrogen Fixation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
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