Bright Tutorials Bright Tutorials
ICSE Class 9 Biology Question 9 of 11

Economic Importance of Fungi — Question 11

Back to all questions
11
Question

Question 1(xi)

Certain free living bacteria in the soil like (P) ............... and (Q) ............... use the free nitrogen of the soil and convert it to ammonia with hydrogen. P and Q are :

  1. P — Rhizobium, Q — Azobacter
  2. P — Azobacter, Q — Clostridium
  3. P — Clostridium, Q — Rhizobium
  4. P — Nitrosomonas, Q — Nitrobacter
Answer

P — Azobacter, Q — Clostridium

Reason — Azobacter and Clostridium convert atmospheric nitrogen (N2) into ammonia (NH3) using hydrogen. This process is known as biological nitrogen fixation.