B8 - Photosynthesis

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B8 - Photosynthesis

B8 - Photosynthesis

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B8.1 - 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

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Adaptations...

  • 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.
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Limiting factors...

  • Anything that stops photosynthesis from happening as fast as it can. 
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Light intensity: (limiting factor)

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

INSERT  DRAWING HERE

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Temperature: (limiting factor)

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

INSERT DRAWING HERE

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Structure of a leaf...

Insert diagram here

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Inverse Square law

  • Light intensity Image result for direct proportion symbol 1  / chnage in distance ^ 2 
  •  
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How plants use starch

  • Glucose: 
  • Sugar made in photosynthesis
  • Provides plant with energy
  • Respiration: 
  • Uses glucose for respiration

Glucose + Oxygen = Carbon dioxide + Water

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Starch

  • 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
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Growth and Repair:

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

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

  • glucose can make fats and oils. 
  • Strenghten cell walls and be an energy store. 
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Making the most of photosynthesis...

  • 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)
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Making the most of photosynthesis...

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

Image result for hydroponics

  • Advantages - Better plants, Quick, Fewer people employed (electronic systems), high profits, clean crops. 
  • Disadvantages - Expensive
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CO2 levels (limiting factor)

lots of co2 = lots of photosynthesis

not much co2 = not much photosynthesis 

Drawing 

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