Agro Section 2
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Agro Section 2
Section 2 including the plant, light, temperature, humidity and rainfall, wind, soil, and water in the soil
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.
Product of photosynthesis. aka glucose
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
Define: carbon partitioning
How plants distribute C from photosynthesis and allocates them in different processes and plant parts.
3 main macronutrients
Nitrogen. Phosphorous. Potassium.
Other macronutrients. (not NPK)
Calcium, Magnesium, Sulfur. High accumulation in plant tissue, but not important.
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)
In what form is nitrogen obtained by plants?
Through soil in the form of NO3.- (nitrate) or NH4 (ammonia).
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)
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.
Other micronutrients (7 elements)
Iron, Copper, Zinc, Manganese, Molybdenum, Boron, Chlorine
The process of water being transported from the soil, to the roots, and exiting the leaves from the stomata.
A set of environmental conditions that includes the interaction of the species in the habitat.
Define: ecological niche
The particular ecological role or function that a species fulfills in its habitat
3 Types of responses & definitions.