1. Describe the basis for crop rotation.

2. Describe the development of a root nodule in a legume.

3. Explain how a legume protects its nitrogen-fixing bacteria fromfree oxygen, and explain why this protection is necessary.

4. What scientific term is used to name the cells that divide to form spores in the anthocerossporophyte?

5. Explain why a symbiosis between a plant and a mycorrhizal fungus is considered to be mutualistic.