Question

Which cannot fix atmospheric nitrogen in the soil.
a) Rhizobium
b) Clostridium
c) Azotobacter
d) penicillin​

Answer 1

Answer:

Here's your answer

Explanation:

The microorganism which cannot fix nitrogen in soil is penicillin.

Because penicillin is used is food and drug production.

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Answer 2

(d) Penicillin cannot fix atmospheric nitrogen in the soil.

Explanation:

• The plants cannot utilize the nitrogen available in its environment in its original form.
• It is because, the nitrogen is available in gaseous form. This form of nitrogen cannot be taken in by the plant.
• Plants takes up nitrogen in the form of nitrates and nitrites.
• There some micro-organisms such as rhizobium, clostridium, and Azotobacter  which plays vital role in nitrogen fixation process.
• On the other hand, penicillin is an antibiotics which is used in the treatment of bacterial disease.
• Thus, it is inferred that, apart from penicillin, all the other three micro-organism are involved in atmospheric nitrogen fixation process.
• Thus, (d) penicillin is the correct option.