EVERYDAY SCIENCE

Detailed explanation-1: -Final answer: Some plants contain nitrogen-fixing bacteria Rhizobium in their root nodules. This relationship is known as mutualism.

Detailed explanation-2: -Legumes are able to form a symbiotic relationship with nitrogen-fixing soil bacteria called rhizobia. The result of this symbiosis is to form nodules on the plant root, within which the bacteria can convert atmospheric nitrogen into ammonia that can be used by the plant.

Detailed explanation-3: -Examples of this type of nitrogen-fixing bacteria include species of Azotobacter, Bacillus, Clostridium, and Klebsiella. As previously noted, these organisms must find their own source of energy, typically by oxidizing organic molecules released by other organisms or from decomposition.

Detailed explanation-4: -Examples of symbiotic nitrogen-fixing bacteria are Rhizobium, associated with leguminous plants; Frankia, associated with actinorhizal plants; and Azospirilum, associated with cereal grasses.

Detailed explanation-5: -The list of nitrogen-fixing plants for agriculture is quite versatile and includes, among others: Beans: fava (aka faba, broad), alfalfa, green (aka French), runner, field, sweet, peanuts (aka groundnuts), soybeans, cream, black-eyed, or purple-hulled beans, lupins, lentils, cowpeas, chickpeas.