Which one of the following microbes forms a symbiotic association with plants and helps them in their nutrition?

1. Azotobacter

2. Aspergillus

3. Glomus

4. Trichoderma

Yeast is used in the production of:

1. Citric acid and lactic acid

2. Lipase and pectinase

3. Bread and beer

4. Cheese and butter

A nitrogen-fixing microbe associated with Azolla in rice fields is:

1. Spirulina

2. Anabaena

3. Frankia

4. Tolypothrix

Which one of the following is an example of carrying out biological control of pests/diseases using microbes?

1. Trichoderma sp. against certain plant pathogens

2. Nucleopolyhedrovirus against white rust in Brassica

3. Bt-cotton to increase cotton yield

4. Ladybird beetle against aphids in mustard