Question

Which of the following will contain nitrogen fixing bacteria?

• A. Stomach of a reptile
• B. Lower epidermis of leaves
• C. Gills of freshwater fish
• D. Large intestine of humans
• E. Root systems of plants

Answer 1

The correct option is E Root systems of plants

On the basis of the relationship between the host and nitrogen fixers, the process of nitrogen fixation is mainly categorized into symbiotic and non-symbiotic. Rhizobium is a symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate the formation of root nodules, enlargements of plant cells and bacteria in intimate association.

So, the correct answer is option E.