Rhizobium is a symbiotic nitrogen fixer. Azospirillum is a nitrogen fixing fungus and Nostoc is anaerobic.

Correct Option: B

Rhizobium is a symbiotic nitrogen fixer. Azospirillum is a nitrogen fixing fungus and Nostoc is anaerobic.

Inulin and raphides crystals are reserve materials in plants. Inulin is a polysaccharide (a polymer of fructose) and is present in compositae. Raphides are bunches of needle like crystal of calcium oxalate found in certain plant cells.

Correct Option: A

Inulin and raphides crystals are reserve materials in plants. Inulin is a polysaccharide (a polymer of fructose) and is present in compositae. Raphides are bunches of needle like crystal of calcium oxalate found in certain plant cells.

Azolla performs nitrogen fixation through its colonies of Anabaena azollae, which have the capacity to fix atmospheric nitrogen.

Correct Option: A

Azolla performs nitrogen fixation through its colonies of Anabaena azollae, which have the capacity to fix atmospheric nitrogen.

A molecule of N₂ is changed to ammonia by nitrogenase. Transaminase transfers amino group from one substrate to another.

Correct Option: A

A molecule of N₂ is changed to ammonia by nitrogenase. Transaminase transfers amino group from one substrate to another.

Molybdenum is a component of nitrogenase and nitrate reductase involved during N₂ fixation. Copper is essential for photosynthesis and respiration. Zinc is involved in synthesis of auxin. Manganese is an activator of enzymes involved in nitrogen metabolism.

Correct Option: A

Molybdenum is a component of nitrogenase and nitrate reductase involved during N₂ fixation. Copper is essential for photosynthesis and respiration. Zinc is involved in synthesis of auxin. Manganese is an activator of enzymes involved in nitrogen metabolism.