• Photosynthesis is the process that uses energy from the sun, together with carbon dioxide and water, to make glucose and oxygen.
  • The primary role of photosynthesis is to make the carbohydrate, suggesting that oxygen, which is released back into the atmosphere, is just a waste product.
  • A leaf consists of several different kinds of specialized tissues that work together to make food by photosynthesis.
  • The major tissues are mesophyll, veins, and epidermis.
  • Stomata are flanked by guard cells that swell or shrink by taking in or losing water through osmosis.
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