Table of Contents
October xx, 2012 Photosynthesis Products, reactants, stomata, transpiration, photosynthesis, chlorophyll
Page #1
October xx, 2012 • Gas exchange and Photosynthesis notes (pasted)
• Reinf.- Photosynthesis and Respiration
Page #2
Vocabulary Triangles
• On p. 1 of your notebook, make vocabulary triangles for the following terms:– Products– Reactants– Stomata– Transpiration– Photosynthesis– Chlorophyll– You can write all six on the same page
Plant Processes: Gas Exchange and Photosynthesis
What is gas exchange in plants?• When we inhale, we breathe in a mixture of gases we
need for survival• When we exhale, we breathe out the waste products• In plants, CO₂ and H₂O are two substances needed for
survival– CO₂ enters through the stomata – H₂O is absorbed through roots of
the plant and released as water vapor through the stomata
Gas Exchange• Light, H₂O and CO₂ all
affect the opening and closing of stomata
• Stomata are usually open during the day and close at night – When stomata closes, less
CO₂ can enter and less H₂O can escape
• When plants lose water vapor through stomata, this is called transpiration
Photosynthesis
• Photosynthesis is the process inwhich plants use light energy to make food– Chlorophyll is a chemical in plants that helps to
capture this light energy• Other than light, plants also need H₂O and CO₂• These molecules combine to form an organic
compound, a carbohydrate (sugar) called glucose
Process of Photosynthesis
6CO₂ + 6H₂O + light energy C₆H₁₂O₆ + 6O₂ Carbon dioxide + water + light (and chlorophyll) produces glucose and oxygen
• A plant needs 6 molecules of carbon dioxide (CO₂) and 6 molecules of water (H₂O) to make one molecule of glucose (C₆H₁₂O₆)
• The chemical bonds in glucose contain the energy the plant needs for growth and survival and is the main source of food for plants
• Oxygen is produced as a waste product during photosynthesis and released through plant stomata
BrainPop
• View the video and write the answers at the bottom of page 2 in your notebook
Graphic Organizer
• On each side of your graphic organizer, write the following: See the side board for a model.
• What?• Where?• Why?• Who?• And copy the equations for photosynthesis
and respiration (p. 430 and 432)
In your groups:
• Using pp. 426-434, answer the questions on the organizer.
• Using the equations and the materials that you have read, fill in the boxes on the photocopy with either:
USES or PRODUCES
• Uses Carbon Dioxide produces• Produces Oxygen uses• Uses water produces• Produces glucose uses• Stores energy releases
Science Journal
• Look at the chemical equations for Photosynthesis and respiration. What comparisons can you make about them? What do you notice about the products and the reactants of each?
