Question

Legume plants like beans and peas often have nodules on their roots that contain nitrogen-fixing bacteria.

What role do nitrogen-fixing bacteria play in the nitrogen cycle?

(1 point)
Responses

They break down dead plant material, releasing nitrogen compounds into the soil
They break down dead plant material, releasing nitrogen compounds into the soil

They convert atmospheric nitrogen gas into ammonia that plants can use
They convert atmospheric nitrogen gas into ammonia that plants can use

They convert ammonia into nitrates through nitrification
They convert ammonia into nitrates through nitrification
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Answer 1

They convert atmospheric nitrogen gas into ammonia that plants can use. Nitrogen-fixing bacteria (e.g., Rhizobium in root nodules) perform nitrogen fixation, making N available to plants.