Which statement about plants with nitrogen-fixing bacteria is true?
A) They often play major roles in early succession.
B) They are often at a competitive disadvantage in late succession due to the energetic costs involved in maintaining their bacterial symbionts.
C) Only a few types of nitrogen-fixing bacteria are associated with plants.
D) Both a and b

Question

Quizplus · Accepted Answer

Plants with nitrogen-fixing bacteria often play major roles in early succession because they can improve soil fertility by adding nitrogen. However, in late succession, they may be at a competitive disadvantage due to the energy costs of maintaining the symbiotic relationship.

Which Statement About Plants with Nitrogen-Fixing Bacteria Is True