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.

Which of the following is true of photosynthesis? a)carbon dioxide is a reactant b)water is a product c)most reactions within this process are exothermic d)oxygen is a reactant

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.