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12 Cards in this Set

  • Front
  • Back
What is the major source of plant nutrition?
Fixation of CO2 from the atmosphere.
What are the nine macronutrients that plants need in relatively large amounts?
Carbon, Oxygen, Hydrogen, Nitrogen, Potassium, Calcium, Magnesium, Phosphorus, and Sulfur.
What are the seven micronutrients that plants need in trace amounts?
Chlorine, Iron, Manganese, Zinc, Boron, Copper, and Molybdenum.
Most elements in the soil are combined into inorganic compounds called ___________.
Most roots of plants are found in the topsoil. What is the composition of topsoil?
Minerals of varying size, living organisms, and humus (partly decayed organic mater).
How is nutrient loss in the soil avoided by farmers?
Crop rotation, plowing under, and use of fertilizers.
What are the three most important mineral nutrients that need to be added to soil?
Nitrogen, Phosphorus, and Potassium. (The numbers on a bag of fertilizer reflect the content of these nutrients)
How do increased CO2 levels affect photosynthesis? How do they affect nitrogen content of plants? Why is this a problem?
It increases the rate of photosynthesis. It lowers the amount of nitrogen in leaves. Herbivores will have to eat more plants to get enough nitrogen.
What are nodules?
Plant tissues that house bacteria that aid in nitrogen fixation for the plant.
What nutrient does carnivorous nature help plants obtain?
How do mycorrhizae help plants obtain nutrients?
They enhance phosphorus uptake (as well as some other micronutrients) and increase the root surface area.
What is phytoremediation? Name some substances that it may be used against.
The use of plants to remove contamination from soil or water. Trichloroethylene (TCE), Trubutritikyebe (TNT), and heavy metals.