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The Ins and Outs of Making Food

The Ins and Outs of Making Food. Pgs 110 - 112. What happens during photosynthesis?. Plants must have carbon dioxide to carry out photosynthesis. Plants also need sunlight to make food.

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The Ins and Outs of Making Food

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  1. The Ins and Outs of Making Food Pgs 110 - 112

  2. What happens during photosynthesis? • Plants must have carbon dioxide to carry out photosynthesis. • Plants also need sunlight to make food. • The energy in sunlight is used to make food in the form of sugar glucose (C6H12O6) from Carbon Dioxide(CO2) and water (H2O)

  3. Capturing Light Energy • Plant cells have organelles called chloroplasts that contain the green pigment chlorophyll that absorbs light energy. • Sunlight is a mixture of all the colors of a rainbow. • Chlorophyll absorbs all colors of light except green. • Plants look green because this is the color they reflect

  4. Making Sugar • The light energy absorbed is used to break down water into hydrogen and oxygen. • Hydrogen is combined with carbon dioxide to make a sugar called glucose. • Oxygen is given off as a by product.

  5. The equation shows that it takes six molecules of CO2 and H2O to make one molecule of glucose and six molecules of oxygen (O2) • Food is stored in plants and then broken down by cellular respiration to use the energy stored.

  6. Gas Exchange • How does a plant absorb gases with a waxy cuticle as its covering? • CO2 enters through an opening in a leaf’s epidermis called a stoma. • Each stomata is surrounded by two guard cells to let CO2 in when sunlight is available.

  7. When the stomata are open oxygen and water vapor exit the leaf. • The loss of water is called transpiration. • Water absorbed by roots is needed to replace water lost through transpiration. • Plants wilt when water loss is too great.

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