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

question 34

Multiple Choice

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.

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