Plant Nutrition and Soils Flashcards
What is highly weathered outer layer of the Earth’s crust?
soil
Where are many roots found?
topsoil
T/F Only minerals dissolved in water in spaces among soil particles are available for uptake by roots.
True
What is about half of the soil volume occupied by?
pores (may be filled with water or air)
Do small pores drain faster than large pores?
no
What is intercropping?
mixing of crops in field
What is conservation tillage?
minimal or even boo-till approaches to farming
What can be done to reduce erosion in great basin?
improve topsoil, more fibrous plants reduce erosion and planting more sagebrush since moves water around an ecosystem effectively
What do acidic soils do?
release minerals that are toxic to plants (Al)
What do saline soils do?
alter water potential, leading to loss of water and turgor in plants
Why is Rubisco important?
alternate pathway in photorespiration, favors carbon dioxide but can use oxygen
T/F C3 photosynthesis occurs in mesophyll cells.
True
T/F C4 photosynthesis uses an extra pathway to shuttle carbon deep within the leaf.
True
T/F In C3 plants, as carbon dioxide increases, the Calvin cycle becomes more efficient.
True
What is phytoremediation?
use of pants to concentrate or breakdown pollutants
