Leg Hemoglobin

Q.

The function of leghemoglobin in the root nodules of legumes is

1. Inhibition of nitrogenase activity

2. Nodule differentiation

3. Oxygen removal

4. Expression of nif gene

Q.

What is the role of molybdenum in plants?

Q.

Who discovered nitrogen fixation?

Q.

Carbon monoxide combines with haemoglobin to form ______________ (carboxyhaemoglobin/oxyhaemoglobin) .

Q. Which among the following best defines leg-haemoglobin?

1. Respiratory pigment supplying oxygen to animal legs
2. Haemoglobin of annelids
3. Pigment helping in nitrogen fixation
4. None of the above

Q. Leghaemoglobin helps in:

1. Transport of oxygen
2. Protecting nitrogenase from oxygen
3. Transport of carbon dioxide
4. Protecting nitrogenase from carbon dioxide

Q. give the difference between the haemoglobin in human body and the haemoglobin present in nodules .

Q.

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:

1. Cytochrome

2. Leghaemoglobin

3. Xanthophyll

4. Carotene

Q. Function of Haemoglobin is to -

1. Generate ATP for Nitrogen fixation
2. Promote $O_2$ availability to root nodules
3. Generate Hydrogen ions for the formation of ammonia
4. Remove or scavenge Oxygen

Q. Which of the following elements is not required for normal growth of the plant?

1. Ca
2. Fe
3. Pb
4. Mg

Q. Which among the following best defines leg-haemoglobin?

1. Respiratory pigment supplying oxygen to animal legs
2. Haemoglobin of annelids
3. Pigment helping in nitrogen fixation
4. None of the above

Q.

In root nodules of legumes, leg-haemoglobin is important because it

1. Transports oxygen to the root nodule

2. Acts as an oxygen scavenger

3. Provides energy to the nitrogen-fixing bacterium

4. Acts as a catalyst in transamination

Q.

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:

1. Cytochrome

2. Leghaemoglobin

3. Xanthophyll

4. Carotene

Q.

What is Leg-haemoglobin in nodules?

Q. The function of leg-haemoglobin in the root nodules of legume plants is to:

1. Supply oxygen to nitrogenase
2. Protect nitrogenase from oxygen
3. Reduce nitrogen to ammonia
4. Provide nitrogen to nitrogen-fixing microbes

Q. Soyabean root exports fixed nitrogen as _____ by _____ (respectively).

1. Ureides; Phloem
2. Ureides; Xylem
3. Amides; Phloem
4. Amino adds; Xylem by

Q. Leghaemoglobin functions as

1. oxygen scavenger
2. nitrogen scavenger
3. carbon dioxide scavenger
4. hydrogen carrier

Q.

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:

1. Cytochrome

2. Leghaemoglobin

3. Xanthophyll

4. Carotene

Q.

The function of leghaemoglobin in the root nodules of legumes is:

1. Expression of nif gene

2. Inhibition of nitrogenase activity

3. Oxygen removal

4. Nodule differentiation

Q. If by radiation all nitrogenase enzyme are inactivated, then there will be no

1. Conversion from ammonium to nitrate in soil.
2. Fixation of nitrogen by legumes.
3. Conversion from nitrate to nitrite in legumes.
4. None of the above.

Q.

In root nodules of legumes, leg-haemoglobin is important because it

1. Provides energy to the nitrogen-fixing bacterium

2. Acts as a catalyst in transamination

3. Transports oxygen to the root nodule

4. Acts as an oxygen scavenger

Q. Which of the following pigment helps in providing oxygen during nitrogen fixation?

1. Haemoglobin
2. Carotenoids
3. Leghemoglobin
4. None of these

Q. Leghaemoglobin functions as

1. oxygen scavenger
2. nitrogen scavenger
3. carbon dioxide scavenger
4. hydrogen carrier

Q. The compound formed when hemoglobin combines with carbon dioxide in blood.

Q. Leghaemoglobin is

1. Respiratory pigment supplying oxygen to animal legs
2. Haemoglobin of annelids
3. None of the above
4. Nitrogen fixing pigment

Q.

name the part of filmaent of cyanobacteria where nitrogen fixation takes place ?/

Q. Leghaemoglobin in symbiotic nodules helps :

1. By scavenging Oxygen
2. To provide energy to the growing symbionts
3. In nitrogen reallocation between symbionts and plants
4. To stabilize redox potential of host cells

Q.

With regard to the Biological Nitrogen Fixation by Rhizobium in association with soybean, which one of the following statement does not hold true.

1. Leg-hemoglobin is a pink coloured pigment.

2. Nitrogenase helps to convert N2 gas into two molecules of ammonia.

3. Nitrogenase requires oxygen for its functioning.

4. Nitrogenase is MO- Fe protein

Q.

how does decrease in the binding affinity of haemoglobin help in altitude sickness?

Q. Identify the role of lectins in the formation of root nodules in legumes.

1. Recognition of compatible Rhizobium by host.
2. Formation of peribacteroid membrane.
3. Formation of infection thread.
4. Formation of shepherd's crook.