B8 - Photosynthesis

B8 - Photosynthesis

• Enegy resource for plants. 
• plants use sunlight to make glucose
• It occours in the leaves
• chlorophyl which is in the chloroplasts carries photosynthesis.

Carbon dioxide + water = oxygen + glucose. 

6CO2                +  6H2O = 6O2    +   C6H2O6

• Leaf:
• Large surface area for light
• thin so CO2 wont have to travel far. 
• Chlorophyll on top of leaves for sunlight. 
• Contain air spaces to allow for diffusion or gases. 
• Xylem (veins) supply water. 

• Algae: 
• Small plants in water
• Adapted to water conditions. 
• On surface of water to take in light
• Get CO2 from water around them.

• Anything that stops photosynthesis from happening as fast as it can. 

• Lots of light = lots of photosynthisis
• Not alot of light = Not alot of phtosynthesis

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• As temperature inscreases photosynthesis increases up to 40 degrees. 
• At 40 degrees the enzymes denature

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• Light intensity  1  / chnage in distance ^ 2 
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• Glucose: 
• Sugar made in photosynthesis
• Provides plant with energy

• Respiration: 
• Uses glucose for respiration

Glucose + Oxygen = Carbon dioxide + Water

• A polymer of of glucose
• (polymer - lots of cells stored together) 
• Insoluble, wont dissolve in water
• Starch is turned back into glucose when needed e.g overnight
• Every plant cell can store starch
• Storage organs to store starch e.g potatoe

• Glucose is needed to make larger amino acids and proteins - synthesis
• Plants will make glucose into complex carbs to stengthen cell walls

• Building blocks of proteins. 
• Made by combining sugars with nitrate ions and minerals from soils

• glucose can make fats and oils. 
• Strenghten cell walls and be an energy store. 

• Greenhouses: 
• Controllable environment
• warm air inside
• faster photosynthesis

• Limiting factors - 
• Morning - low temperatures, low light
• Noon - high temperature, denatures enzymes, CO2 decreases
• Cold Winters day - Low temperature, less daylight (shorter days)

• Hydroponics:
• Plants are grown in water with a perfect balance of nutrients.

• Advantages - Better plants, Quick, Fewer people employed (electronic systems), high profits, clean crops. 
• Disadvantages - Expensive

lots of co2 = lots of photosynthesis

not much co2 = not much photosynthesis 

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