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CyfarthfaB2photosynt

QuestionAnswer
Photosynthesis equation? Carbon dioxide + water --> glucose + oxygen
Energy required for photosynthesis Light
Layer in the leaf where most photosynthesis takes place Palisade layer
Plant cell structure where photosynthesis takes place Chloroplast
Green substance that absorbs light energy Chlorophyll
Reaction to release energy from the glucose made Respiration
Substance made to store glucose Starch
Substance made from glucose for cell walls Cellulose
Substance made from glucose used for growth Protein
Three limiting factors for photosynthesis Light intensity, carbon dioxide concentration temperature
Explain why light intensity affects photosynthesis rate Light provides the energy needed for the reaction, more light = more energy = more reactions
Describe the shape of the graph showing light intensity and photosynthesis rate Increase then plateau (stays the same)
Explain what it means when light intensity stops increasing the rate of photosynthesis Light intensity is no longer the limiting factors, something else is
Explain why carbon dioxide concentration affects rate of photosynthesis Carbon dioxide is a raw material / reactant, more reactants = more reactions
Describe shape of the graph of carbon dioxide concentration and rate of photosynthesis Increase then plateau (stays the same)
Explain why temperature affects photosynthesis rate Photosynthesis is controlled by enzymes which are affected by enzymes
Describe the shape of the graph for temperature and rate of photosynthesis Bell shaped curve / increase then decrease
Explain why temperature initially increases photosynthesis rate Higher temperature = particles have more energy, move more, more collisions between enzymes and substrate
Explain why after the optimum, temperature decreases photosynthesis rate Enzymes denatured- active site changes shape and can no longer fit with substrate
What is the chemical used to test for starch? Iodine
What are the two steps needed before adding iodine to a leaf to test for starch? Boil leaf in water Soak in ethanol
Why does the leaf need to be boiled before testing for starch? Break down cell walls
Why does the leaf need to be soaked in ethanol before testing for starch? Remove chlorophyll
What colour change is observed if starch is present? Orange/brown to Blue/black
Created by: MissRParry
 

 



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