During biological nitrogen fixation, the cells of which of the following regions take part in the formation of nodules in roots for bacteroides?
1. Epidermis
2. Cortex
3. Endodermis
4. Vascular bundle

Azotobacter and Bacillus polymyxa are

1. Decomposers

2. Nonsymbiotic nitrogen fixer

3. Symbiotic nitrogen fixer

4. Pathogenic bacteria

Which of the following minerals required by a plant is not a ‘macronutrient’?
1. Iron
2. Sulfur
3. Potassium
4. Calcium

Nitrogen fixing bacteria live in the nodules in a plant root. These nodules are formed by the cells of:
1. Epidermis
2. Cortex
3. Endodermis
4. Vascular cylinder

For each NH₃ produced, the number of ATP molecules required by the nitrogenase enzyme is:
1. 4
2. 8
3. 12
4. 16

Identify the incorrect statement:
1. Frankia does not produce nitrogen-fixing nodules on the roots of non-leguminous plants
2. Microbes like Rhizobium live as aerobes under free living condition and become anaerobic during nitrogen fixing events
3. Nitrogenase is a Mo-Fe protein
4. Azotobacter and Beijernickia are free-living are free living nitrogen-fixing aerobic microbes.

The product(s) of the reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are.

1. Nitrate alone

2. Ammonia and oxygen

3. Ammonia and hydrogen

4. Ammonia alone

Match the following concerning essential elements and their functions in plants:

Which of the following bacteria reduce nitrate in soil into nitrogen?

1. Nitrobacter

2. Thiobacillus

3. Nitrococcus

4. Nitrosomonas

Mark the correct option with respect to hydroponics

1. It can avoid problem of soil borne pathogens

2. It avoids problem of weeding

3. Out of season vegetables and flowers can be obtained

4. all of these