• Created by: R214116
  • Created on: 18-10-18 20:06

What is photosynthesis?

  • process that produces glucose for in plants and algae.
  • happens inside chloroplasts

The raw materials for photosynthesis:

  • sunlight beats down on the leaf and is absorbed by green chlorophyll in chloroplasts and provides energy for the reaction
  • water reaches the cells via xylem
  • CO2 diffuses into the leaf

Equation for photosynthesis:

  • carbon dioxide + water >>>>light energy>>>> glucose + oxygen
    6CO2 + 6H2O >>>> light energy>>>> C6H12O6 +6O2
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Leaf structure

Plants are made of organs like stems, roots and leaves.
These organs are made of tissues.

Leaves are made of:

  • mesophyll tissue- where most photosynthesis happens
  • xylem and phloem - transport water, mineral ions and sucrose around the plant
  • epidermal tissue - covers the whole plant
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Rate of Photosynthesis - Light

Not enough light slows the rate of photosynthesis.

  • light provides energy needed for photosynthesis
  • as light level increases, the rate of photosynthesis increases but only until a certain point
  • at this point it is no longer the mimicking factor

In a lab

  • in a lab, you can change light intensity by moving a lamp closer and further away from a plant.
  • you should measure light intensity using a light meter
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Rate of Photosynthesis - Carbon Dioxide

Too little carbon dioxide slows the rate of photosynthesis

  • carbon dioxide is a raw material for photosynthesis
  • as carbon dioxide levels increase, the rate of photosynthesis increases up until a certain point
  • after this, carbon dioxide is no longer the limiting factor

In a lab

  • carbon dioxide levels can be increased by dissolving different amounts of sodium hydrogencarbonate in the water.
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Rate of Photosynthesis - Temperature

The temperature must be just right

  • temperature can be the limiting factor because it's too low - the enzymes needed for photosynthesis work slower in the cold
  • if the temperature is too high, enzymes will become denatured (45 degrees)

In a lab

  • temperature levels can be controlled using a water bath
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