1. What is the rhizosphere? 2. When we think of roots, we naturally think of absorption: the absorption of water and minerals from the soil. However, roots do other things, too. Explain two other root processes described in this article.

3. Describe the main similarities and differences between the the relationship between a legume and rhizobia and the relationship between a fungus and a plant.

4. The rhizosphere greatly influences root structure, but what other factors also influence root structure? List at least three.

When analyzing tree rings, what do scientists assume a thin ring indicates?

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.