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Photosynthesis

Photosynthesis. SBI 3C. Overview. All energy on earth comes from the sun. We depend on: Plants Algae (underwater plants) Cyanobacteria (photosynthetic bacteria) To provide this energy to us!. Overview. Overview. Carbon dioxide and water are taken in by plants

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Photosynthesis

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  1. Photosynthesis SBI 3C

  2. Overview • All energy on earth comes from the sun. • We depend on: • Plants • Algae (underwater plants) • Cyanobacteria (photosynthetic bacteria) • To provide this energy to us!

  3. Overview

  4. Overview • Carbon dioxide and water are taken in by plants • Plants absorb light energy and convert it to a usable form. • ATP • Energy is used to “fix” carbon dioxide into sugar molecules • Chemical energy • Sugar is converted to starch and stored for use by the plant, and by animals when they eat plants.

  5. Chloroplasts • Have TWO membranes • A “bi-bilayer!” • The inner membrane is called the thylakoid. • The thylakoid is folded and looks like stacks of coins called granum (grana singular). • The stroma is the space surrounding the granum Image source: http://www.daviddarling.info/encyclopedia/C/chloroplasts.html

  6. Chloroplasts • Chlorophyll molecules are embedded in the thylakoid membrane • Act like a light “antenna” • These molecules can absorb sunlight energy. Image from Biology 11: College Preparation. Pg 73. Nelson, Toronto. 2003.

  7. Light (dependent)Reactions • Happen ONLY in sunlight • Hence they depend on light! • Light is absorbed by chlorophyll molecules • The energy generates molecules of ATP Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto. 2003.

  8. Light Independent Reactions(formerly the “dark reactions”) • Happen in sunlight, and in the dark. • Hence “independent of light” • ATP generated by sunlight drives the Calvin Cycle. • Monosaccarides (eg. glucose) are manufactured in the cycle. • Monosaccarides are used to “build” polysaccharides (eg. Starch). Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto. 2003.

  9. Overall Reaction What is the equation for photosynthesis? carbon dioxide + water  glucose + oxygen + energy 6CO2 + 6H2O  C6H12O6 + 6O2 + energy

  10. Summary Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto. 2003.

  11. Why do leaves turn brown in the fall? • It’s all about pigments! • Let’s go outside and collect some leaves! • to be continued… =)

  12. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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