OCR A Level Biology

Revision Notes

5.6.1 Photosynthesis & Respiration

Photosynthesis & Respiration

  • Photosynthesis occurs in autotrophic organisms such as plants, algae and cyanobacteria
  • In the process of photosynthesis, light energy is trapped and used to convert simple inorganic compounds into complex organic compounds. Energy is stored within these organic compounds
  • Respiration occurs in all living organisms
  • Respiration is the process by which energy is released from organic molecules in living cells. The process can be aerobic (using oxygen) or anaerobic (without using oxygen)
  • There are several similarities and differences between photosynthesis and the two types of respiration
  • For example, the coenzyme NADP is used in photosynthesis whereas the coenzyme NAD is used in both aerobic and anaerobic respiration

Comparing Photosynthesis & Respiration Table
Comparing Photosynthesis & Respiration Table 1, downloadable AS & A Level Biology revision notes Comparing Photosynthesis & Respiration Table 2, downloadable AS & A Level Biology revision notes

Exam Tip

Remember, energy is never created or destroyed; it is converted from one form to another!

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