Question

Which of the following is wrongly matched?

• A. Humus - Abiotic component
• B. Rhizobium - Free- living nitrogen fixer
• C. Phosphorous cycle - Sedimentary
• D. Shorea robusta -Tropical deciduous forest
• E. Cedrus deodara - Coniferous forest

Answer 1

The correct option is B Rhizobium - Free- living nitrogen fixer

Rhizobium is a symbiotic nitrogen fixer. They are soil bacteria and becomes established inside root nodules of legumes. In order to express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are Gram-negative, motile, non-sporulating rods.

So, the correct answer is option B.