Leghaemoglobin percent in the root nodules of leguminous plants helps in nitrogen fixation by

Leghaemoglobin per cent in the root nodules of leguminous plants helps in nitrogen fixation by

A

Removing oxygen

B

Providing oxygen

C

Helping in aerobic respiration

D

None of the above

Assertion (A) Leguminous plants are nitrogen fixers.
Reason (R) Leguminous plants have Rhizobium in their root nodules.

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true, but R is not the correct explanation of A

C

A is true, but R is false

D

A is false, but R is true

The bacterium which lives symbiotically in the root nodules of leguminous plants and fix atmospheric nitrogen is:

A

Nitrobacter

B

Nitrosomonas

C

Rhizobium

D

Xanthomonas

The nitrogen fixing bacteria present in the root nodules of leguminous plant is

A

Salmonella

B

Clostridium

C

Rhizobium

D

Pseudomonas

The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in leguminous root nodules is

A

Nitrate reductase

B

Nitrite reductase

C

Pyridoxal phosphate

D

Nitrogenase

E

Answer not known

Nitrogen fixing bacteria present in the nodules of the root of leguminous plant are

A

Symbiotic

B

Protolytic

C

Saprophytic

D

Parasitic

In root nodules of legumes, leghaemoglobin is important because

A

it transports oxygen to the root nodule

B

it acts as an oxygen scavenger

C

it provides energy to the nitrogen fixing bacterium

D

it act as a catalyst is transmination

In leguminous plants, both the rhizobium genes and the plant genes influence nodulation and nitrogen fixation. Which one of the following functions is not encoded by the host plant genes?

A

Production of inducers that modify rhizobial cell wall

B

Production of flavonoid inducers

C

Establishment of contact between bacteria and legume

D

Root hair curling

The root nodules of casuarina which are capable of symbiotic nitrogen fixation contains the microbe

A

Rhizobium

B

Anabena

C

Frankia

D

Azotobacter

Function of Leghaemoglobin in nitrogen fixation _____

A

Absorption of oxygen

B

Nutrion of bacteria

C

Absorption of light

D

All

Leghaemoglobin percent in the root nodules of leguminous plants helps in nitrogen fixation by

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