quiz 3

3. the extensive activity of humans, in reshaping the soil around us and depositing within it waste and artifacts, has led to the designation of a new soil layer referred to as the ___________ epipedon.
5. this plant macronutrient is needed for the synthesis of DNA, ATP, and the lipid bilayer, among other roles
6. a soil that is a mixture of sand, silt, and clay is referred to as this
9. this property of soil is used to describe the proportion of different sized particles within it
10. the number of offspring a a plant leaves through seeds is referred to as female _________
12. the timing of growth and reproduction within a year
13. seed predation is referred to as _________
14. the largest class of soil particles
15. the smallest class of soil particles

1. limited resources and time may result in __________ (two words) between plant investment in growth, survival and reproduction
2. the schedule of a plant’s birth, growth and mortality (two words)
4. the microbe-rich environment immediately surrounding plant roots, which includes the root cortex
6. plants in this family form symbiotic associates with nitrogen fixing bacteria in structures called “nodules” in their roots (common name of family)
7. activity in the rhizosphere is largely driven by the presence of these compounds that are secreted from plant roots
8. availability of moisture is an important ________ factor affecting the timing of plant flowering
11. plants that reproduce in one single event