Question

Match the following:
A B
(i) Azotobacter (a) anaerobic nitrogen fixer.
(ii) Clostridium (b) aerobic nitrogen fixer
(iii) Lichens (c) aerobic nitrogen fixing cyanobacterium
(iv) Anabaena (d) symbiotic nitrogen fixer.

Answer 1

Explanation:

(1) - (b)

(2) - (a)

(3) - (d)

(4) - (c)

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Answer 2

Answer:  

(i) Azotobacter – (b) 'Aerobic Nitrogen Fixer'  

(ii) Clostridium – (a) 'Anaerobic Nitrogen Fixer'  

(iii) Lichens – (d) 'Symbiotic Nitrogen Fixer'  

(iv) Anabaena – (c) 'Aerobic Nitrogen-Fixing Cyanobacterium'  

Explanation:  

The process through which the nitrogen in molecular form is converted to urea, or ammonia or any other nitrogen-containing compound is known as 'nitrogen fixation'. This is a fundamental activity of microorganisms.

Nitrogen-fixing can be aerobic as well as anaerobic. Anaerobic nitrogen fixation is done by bacteria like Clostridium. Aerobic nitrogen fixation is done by bacteria and another life form as Azotobacter, Lichens, Anabaena etc.