Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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 ___________.
|
Minerals.
|
|
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?
|
Nitrogen.
|
|
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.
|