Bellwork What are the three most critical substances plants need to survive?

(C) Copyright 2016 – CPALMS all rights reserved Photosynthesis Image sources: http://biocross.wikispaces.com/Protista http://philschatz.com/biology-book/contents/m44448.html https://en.wikibooks.org/wiki/Structural_Biochemistry/Three_Domains_of_Life/Bacteria Protista Plants Bacteria (C) Copyright 2016 – CPALMS all rights reserved

Learning Goal The student will be able to explain how living systems follow the Laws of Conservation of Mass and Energy.

What is photosynthesis? Photosynthesis is a process in some living organisms (plants & bacteria) that uses energy from the sun, carbon dioxide, and water to make sugars (glucose). Oxygen is released into the air during photosynthesis. Image source: http://pung6.wikispaces.com/Group+1 (C) Copyright 2016 – CPALMS all rights reserved

Where does photosynthesis occur? Photosynthesis takes place in organelles called chloroplasts. A green pigment called chlorophyll, in chloroplasts, captures energy from sunlight. Image source: http://www.thaigoodview.com/node/31939?page=0%2C17 (C) Copyright 2016 – CPALMS all rights reserved

What is photosynthesis’s chemical reaction? 6CO2 + 6H2O + Light energy → C6H12O6 + 6O2 Carbon Dioxide + Water + Light energy Glucose + Oxygen Energy (from sunlight) combines with carbon dioxide and water to form the sugar, glucose, and oxygen gas. Image source: http://pung6.wikispaces.com/Group+1 The teacher should explain that photosynthesis is a chemical process, with reactants and products. (See next slide for details on reactants and products) (C) Copyright 2016 – CPALMS all rights reserved

6CO2 + 6H2O + Light energy → C6H12O6 + 6O2 Reactants vs. Products Reactants are what is needed to make something. The reactants for photosynthesis are: Carbon Dioxide, Water, and Sunlight 6CO2 + 6H2O + Light energy → C6H12O6 + 6O2 Products are what is made. The products for photosynthesis are: Glucose (sugar) and Oxygen (C) Copyright 2016 – CPALMS all rights reserved

(C) Copyright 2016 – CPALMS all rights reserved Reactants vs. Products Glucose stores chemical energy, and photosynthetic organisms (plants, protists, and bacteria) store glucose. When another organism, like an animal, eats a photosynthetic organism, they use the stored glucose for energy. Image source: https://www.youtube.com/watch?v=uixA8ZXx0KU Teacher notes: Teacher may want to introduce the concept that not all of the glucose produced is stored. Some of the glucose is used for growth, maintained and repair of the plant. (producing flowers, seeds, leaves, growing stem, etc.) (C) Copyright 2016 – CPALMS all rights reserved