What Are Biofertilizers

Q.

Name the common biofertilizers used in organic farming.

Q.

Biofertilizer include

1. nitrogen-fixing bacteria

2. nitrogen-fixing cyanobacteria

3. both bacteria and cyanobacteria

4. nitrogen-fixing bacteria, nitrogen-fixing cyanobacteria and mycorrhizal fungi

Q. Regarding the assertion and reason, select the right option.
Assertion: Compost is formed after decay of vegetable matter and organic refuse.
Reason: Green manure is a fertilizer consisting of growing plants that are ploughed back into the soil.

1. Both the assertion and reason are true and the reason is the correct explanation for the assertion.
2. Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false
4. Both the assertion and reason are false.

Q.

An organism used as a biofertiliser for raising soyabean crop production is

1. Azospirillum

2. Rhizobium

3. Nostoc

4. Azotobacter

Q. Which of the following is true pair of biofertilizers?

1. Azolla and BGA
2. Nostoc and legume
3. Rhizobium and grasses
4. Salmonella and E.coli