Home PYQs UPPSC UPPSC MCQs Prelims 2017 (GS Paper I)

Question

Which one of the following is not correctly matched? Nitrogen fixing agent – Crop

  1. Blue green algae – Paddy
  2. Rhizobium Leguminisarum – Pea
  3. Azotobacter – Wheat
  4. Azolla – Maize

Answer:

Option D: Azolla – Maize

Detailed Solution:

The correct answer is “Azolla – Maize”.

Azolla is a water fern that forms a symbiotic relationship with the nitrogen-fixing cyanobacterium Anabaena azollae. This association is commonly used in rice cultivation (Paddy) to enhance nitrogen availability in the soil. It is not typically used with maize.

Organism Crop
Blue green algae Paddy
Rhizobium Leguminisarum Pea
Azotobacter Wheat
Azolla Paddy