Photosynthesis By Deepthi Sri. Overview All energy on earth comes from the sun. We depend on: –Plants –Algae (underwater plants) –Cyanobacteria (photosynthetic.

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Presentation transcript:

Photosynthesis By Deepthi Sri

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

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.

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:

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

Light (dependent)Reactions Happen ONLY in sunlight –Hence they depend on light! 1.Light is absorbed by chlorophyll molecules 2.The energy generates molecules of ATP Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto

Light Independent Reactions (formerly the “dark reactions”) Happen in sunlight, and in the dark. –Hence “independent of light” 1.ATP generated by sunlight drives the Calvin Cycle. 2.Monosaccarides (eg. glucose) are manufactured in the cycle. 3.Monosaccarides are used to “build” polysaccharides (eg. Starch). Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto

Overall Reaction What is the equation for photosynthesis? carbon dioxide + water  glucose + oxygen + energy 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 + energy

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

Why do leaves turn brown in the fall? It’s all about pigments! Let’s go outside and collect some leaves!

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