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  • Organisms that make their own food are called autotrophs. There are only a few organisms, other than green plants, that can do this.
  • Radiant energy is energy traveling in waves for example electromagnetic radiation, as heat, light, or X-rays. All components of photosynthesis may be present but without the plant pigment chlorophyll no photosynthesis will take place.
  • Introduce students to the terms xylem and phloem. They do not need to memorize these terms. Xylem is a series of tubes which carry water and minerals up to the leaves. Phloem is plant tissue that conducts and distributes sugars from the places where the food is produced to the places where it is needed or stored.
  • To avoid misconceptions from developing, remind students that carbon dioxide is always in the air, and that plants to not use all the CO 2 available.

Photosynthesis powerpoint Photosynthesis powerpoint Presentation Transcript

  • Photosynthesis or How Plants Make Food
  • Energy from the Sun is necessary to begin the process. Besides green plants, some algae and some bacteria can also make their own food.
  • Radiant energy from the Sun, in the form of light, begins photosynthesis. Chlorophyll must also be present
  • Water is taken into the plant by the roots and carried to the leaves through the xylem . Xylem is a series of tubes. H 2 0 H 2 0 H 2 0
  • Carbon dioxide gas (CO 2 ) is taken into the plant through the stomata on the underside of leaves. H 2 0 H 2 0 H 2 0 CO 2 CO 2 CO 2
  • Oxygen gas (O 2 ) is released into the atmosphere through the stomata on the under side of leaves. H 2 0 H 2 0 H 2 0 O 2 O 2 O 2
  • Water vapor is released into the atmosphere through the stomata on the leaves. This process is called transpiration. H 2 0 H 2 0 H 2 0
  • Review the process. Explain each step as it is shown. H 2 0 H 2 0 H 2 0 CO 2 CO 2 CO 2 O 2 O 2 O 2 H 2 0 H 2 0 H 2 0
  • Remember, this process is continuous in light. H 2 0 H 2 0 H 2 0 CO 2 CO 2 CO 2 O 2 O 2 O 2 H 2 0 H 2 0 H 2 0