The symbiotic association between fungi and roots of higher plants is called:

1. Lichen

2. Mycorrhiza

3. Biofertilizer

4. BOD

Which of the following cyanobacteria can fix atmospheric nitrogen?

A. Nostoc

B. Anabaena

C. Oscillatoria

D. Yeast

1. A, C, D

2. C, D

3. A, C

4. A, B, C

Which of the following serve as biofertilizer in paddy fields?

(1) Bacteria

(2) Yeast

(3) Cyanobacteria (blue-green algae)

(4) Fungi

Which of the following cannot be a biofertiliser?

1. Cyanobacteria

2. Fungi

3. Viruses

4. Bacteria

In mycorrhiza association the fungal symbiont
helpful in :
1. Phosphorus nutrition.
2. Resistance to root borne pathogen.
3. Tolerance to salinity and drought.
4. All the above.

Which of the following bacteria help in nitrogen fixation from atmosphere?

A. Azotobacter

B. Rhizobium

C. Azospirillum

D. Lactobacillus

(1) A, C, D

(2) A, B, C, D

(3) B, C, D

(4) A, B, C

The organisms which are used to enrich the nutrient quality of the soil are called:

1. Mycorrhiza

2. Biofertilizers

3. Yeast

4. Methanogens

Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?

1. Aspergillus and Rhizopus

2. Rhizobium and Rhizopus

3. Cyanobacteria and Rhizobium

4. Aspergillus and Cyanobacteria

Which one is used/regarded as a biofertilizer?

1. An association between pteridophytes and cyanobacteria Anabaena

2. An association between gymnosperms and Nostoc

3. An association between legume and Rhizobium

4. All of the above