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Photosynthesis notes



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  • 1. Photosynthesis is a process whereby green plants manufacture their own food.
  • 2.  Materials used during the process of photosynthesis are: water, sunlight and carbon dioxide.The by-products are: oxygen and sugars.
  • 3. Photosynthesis can be summarizedin the following equation: 6 CO2 + 12H2O+ Light energy C6H12O6 + 6 O2 + 6H2O (glucose)
  • 4. Who or what photosynthesizes? Photoautotrophs can photosynthesize. Includes: green plants, algae, cyanobacteria and green protists
  • 5. The importance of photosynthesisTo provide nutrients and oxygen for heterotrophs.Heterotrophs are dependent on autotrophs, because they cannot produce their own food.Auto means self: troph means feedingThus plants are self-feeding organisms meaning that they make their own food.
  • 6. RAW MATERIALS OFPHOTOSYNTHESIS• The raw materials of photosynthesis are:  water, carbon dioxide and sunlight.
  • 7. Where in the plants doesphotosynthesis occur? Photosynthesis occurs in the chloroplasts of plant cells. The chloroplasts are mainly concentrated in the mesophyll cells of leaves. Chloroplast contain chlorophyll – green pigment that absorbs sunlight. Chlorophyll fill the space in the thylakoid membrane.
  • 8. Chloroplast structure
  • 9. HOW RAW MATERIALS REACH THECHLOROPLASTS Water is absorbed through the root hair into the xylem of the roots, into the xylem of the stem, through the xylem of the leaves into the mesophyll cells and finally into the chloroplasts. Carbon dioxide diffuses from the atmosphere through the stomata, into the intercellular airspaces in the leaves, and finally into the chloroplasts of the mesophyll cells. The chlorophyll and other pigments in the thylakoid membrane absorb the solar energy to drive photosynthesis
  • 10. The function of the stomata inphotosynthesisA stomata is a pore that is found on the leave.It plays a vital role in the gaseous exchange; Carbon dioxide diffuses from the atmosphere through the stomata into the leave.Oxygen diffuses from the leaves through the stomata into the atmosphere.
  • 11. Factors that that causes a changein the rate of photosynthesis Light, concentration of carbon dioxide and temperature. With light: less sun= less photosynthesis, More sun= more photosynthesis. This is because there is a light dependant reaction as part of photosynthesis, and therefore photosynthesis can only happen when there is enough sunlight. The more the carbon dioxide, the faster the rate of photosynthesis.
  • 12.  Increasing the temperature increases the rate of photosynthesis. This is because there are enzymes in the process of photosynthesis. Enzymes activity increases with an increase in rate of the temperature (up to a point, when it is too hot for the enzymes to work).
  • 13. The importance of photosynthesis A reviewo Photosynthesis produce oxygen into the atmosphere .o Plants store excess sugar as starch in roots, tubers, seeds, and fruits.o Plants produce food by through the process of photosynthesis.
  • 14. References Williamson, J. (2011). Unit 6: Photosynthesis (Process of food production by plants) PowerPoint Slides. Johannesburg: University of Johannesburg. _leaf ( Accessed on 15 October 2012)