Agro Section 2

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Agro Section 2
2014-09-25 22:21:45
concepts vocab

Section 2 including the plant, light, temperature, humidity and rainfall, wind, soil, and water in the soil
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  1. Photosynthesis equation.
    6CO2.+12H2.0+light energy=yields=C6.H12.06.+6O2.+6H2.O
  2. Define: carbon fixation
    The dark reaction. Carbon atoms from the atmosphere (CO2.) are used to form organic compounds. Driven by energy from ATP and NADPH from light reaction.
  3. Define: photosynthate
    Product of photosynthesis. aka glucose
  4. Differentiate C3, C4, and CAM.
    • C3- 3 carbon compound rings formed, good in cool conditions, stomata open during the day
    • C4- 4 carbon compound rings formed, bundle sheaths which allow C3 to occur during the dark cycle, stomata open during day
    • CAM- Crassulacean acid metabolism, stomata open during night, 4 carbon compound rings, CO2 stored in vacuoles and is used during the day
  5. Define: carbon partitioning
    How plants distribute C from photosynthesis and allocates them in different processes and plant parts.
  6. 3 main macronutrients
    Nitrogen. Phosphorous. Potassium.
  7. Other macronutrients. (not NPK)
    Calcium, Magnesium, Sulfur. High accumulation in plant tissue, but not important.
  8. Nitrogen. Why is it important?
    • Involved in 50% of plant biomass. It's in amino acids and proteins. A part of chloroplasts.
    • Deficiency causes yellowing of leaves (chlorosis)
  9. In what form is nitrogen obtained by plants?
    Through soil in the form of NO3.- (nitrate) or NH4 (ammonia).
  10. Phosphorous. Why is it important? Where does it come from?
    • .25% of biomass. Important in lots of compounds like nucleic acids, nucleoproteins, phytin, phospholipids, ATP etc. Effects cell wall permeability.
    • Come from parent materials in lower soil level.
    • Leaves become blue-purple underneath (due to anthocyanins)
  11. Potassium. Why is it important?
    • 1-2% of dry weight. Regulates plant functions, and used in enzyme. Needs to be present to form starches and sugars.
    • Absorbed as a cation K+ from the soil.
    • Deficiency causes dry tips and curled leaf edges.
  12. Other micronutrients (7 elements)
    Iron, Copper, Zinc, Manganese, Molybdenum, Boron, Chlorine
  13. Define: transpiration
    The process of water being transported from the soil, to the roots, and exiting the leaves from the stomata.
  14. Define: habitat
    A set of environmental conditions that includes the interaction of the species in the habitat.
  15. Define: ecological niche
    The particular ecological role or function that a species fulfills in its habitat
  16. 3 Types of responses & definitions.
    • Triggered-
    • Dependent-
    • Independent-