Exam 2
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What are some plant uses for water?
• Seed Germination • Transplant Establishment • Turgor Pressure in Cells • Transportation • Movement of Dissolved minerals and carbohydrates • Photosynthesis Acronym: STTTMP
How do plants conduct water?
Acropetal up through xylem, basipetal down through phloem
What is transpiration?
The movement of water through plants
What are two theories of water movement?
• Cohesion Tension • Pressure Flow
What are important facts about stomates?
• 1% of leaf area • Tiny • Underside of the leaf • Thickened cell walls on one side
What percentage of a plant is water?
95%
What factors affect transpiration?
• Temperature • Humidity • Wind • Light Intensity • Leaf area
What are some plants’ responses to loss of water?
• Wilting • Loss of turgor pressure • Roll/Curling up
How do plants avoid drought?
• Dormancy • Modified roots • Xeromorphic features • Escape through annual leaves
What does ET mean?
Evapotranspiration
How can water loss be managed?
• Plant selection • Shading • Anti-transpiration • Irrigation
Why are healthy roots essential?
• Aerification • Increase O2 • Relieved compaction • Drainage
What are the effects of over or under watering?
Under watering = wilting and loss of turgor pressure Overwatering = root rot
What is hydroponics?
Urban farming method allowing growth in local areas
What are the advantages of hydroponics?
• No soil • Larger plants • More productivity • Easier harvest • Fewer pests
What are the disadvantages of hydroponics?
• Cost • No soil buffer • Labor • Knowledge
What are the different types of hydroponics systems?
• Reservoir Systems • Nutrient Film Technique • Aeroponics • Ebb and Flow • Drip Systems • Wicking • Aquaponics
What is the equation for photosynthesis?
CO2 + H2O + light -> C6H12O6 + O2
What is organic chemistry?
Study of carbon and its bonds
What are the two reactions in photosynthesis?
• Light Reaction • Dark Reaction
What are some ingredients for photosynthesis?
• Light • Oxygen • Carbon • Water
What are the resulting effects of light absorption?
• Orientation of leaves • Shading • Size of leaves • Leaf area • Nature of surface
When is CO2 the highest?
In the winter at night time
What is the light reaction?
Involves three phases: Photosystem II, Redox Chain, Photosystem I