AP BIOLOGY

ECOLOGY

CHEMICAL CYCLES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Where are nitrogen-fixing bacteria found?
A
in water
B
root nodules
C
in dead things
D
in the atmosphere
Explanation: 

Detailed explanation-1: -Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia.

Detailed explanation-2: -Nitrogen fixing bacteria are present on root nodules of leguminous plants to fix nitrogen.

Detailed explanation-3: -Leguminous plants like pea plant have nitrogen fixing bacteria called Rhizobium bacteria in their root nodule.

Detailed explanation-4: -Root nodules are commonly found in the roots of leguminous plants. They are formed due to association with a nitrogen-fixing bacteria, Rhizobium. Rhizobia is the general term used for different genera of nitrogen-fixing bacteria, e.g. Rhizobium, Bradyrhizobium, Azorhizobium, etc.

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