Question

which of the following is a biological nitrogen fixer ?
a. housefly b. smallpox c. blue green algae d. protozoa ​

Answer 1

Answer:

c. blue green algae is the correct answer.

Explanation:

Biological Nitrogen Fixation is a process in which the air containing nitrogen is converted into Ammonia or some other nitrogenous compounds in soil.

Ammonia is used in metabolism by many organisms.

There are microorganisms in soil which include bacteria which helps in nitrogen fixation.

Some bacteria also make symbiotic relationship with plants like legumes.

Symbiotic relationship is that relationship in which host plant helps bacteria to convert nitrogen to ammonia like in legumes nodules are formed on roots by bacteria where conversion happens.

Answer 2

Answer:

The answer is Blue green algae

Explanation: