Why have some plants evolved mutualistic relationships with nitrogen-fixing bacteria?
A)The bacteria transform nitrogen into forms useful forms for the plants; the plants provide water and a place for the bacteria to live.
B)The bacteria protect the plant from harmful effects of nitrogen compounds such as ammonia; the plants provide carbohydrates for the bacteria.
C)The bacteria utilize nitrogen to produce energy for the plants; the plants provide the source of the nitrogen for the bacteria.
D)The bacteria provide natural immunities to the plants; the plants shelter the bacteria from predators.

Question

Quizplus · Accepted Answer

The bacteria convert atmospheric nitrogen into forms that plants can absorb and use (such as ammonia, nitrate, and nitrogen dioxide), which is essential for plant growth. In return, the plants supply the bacteria with carbohydrates produced through photosynthesis and a protective environment within their root nodules.

Why Have Some Plants Evolved Mutualistic Relationships with Nitrogen-Fixing Bacteria