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Photosynthesis
Explain photosynthesis as the method by which plants create carbohydrates from basic materials using light energy.
11
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110
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77
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90 min
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CambridgeIGCSEBiologyPlant nutrition
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Photosynthesis outcomes11 objectives
- Explain photosynthesis as the method by which plants create carbohydrates from basic materials using light energy.
- Provide the word equation for photosynthesis: carbon dioxide plus water yields glucose plus oxygen, occurring in the presence of light and chlorophyll.
- Recognize that chlorophyll is a green pigment located in chloroplasts.
- Acknowledge that chlorophyll converts light energy into chemical energy for carbohydrate synthesis.
- Summarize how carbohydrates produced in photosynthesis are used and stored, including: (a) starch as an energy reserve (b) cellulose for cell wall construction (c) glucose for energy in respiration (d) sucrose for transport in phloem (e) nectar to attract pollinators.
- Discuss the significance of: (a) nitrate ions in amino acid production (b) magnesium ions in chlorophyll synthesis.
- Examine the necessity of chlorophyll, light, and carbon dioxide for photosynthesis, ensuring appropriate controls are in place.
- Investigate and explain how varying light intensity, carbon dioxide levels, and temperature influence the rate of photosynthesis.
- Investigate and describe how light and dark conditions affect gas exchange in an aquatic plant using a hydrogencarbonate indicator solution.
- Provide the balanced chemical equation for photosynthesis: 6CO2 + 6H2O → C6H12O6 + 6O2.
- Identify and discuss the limiting factors that affect photosynthesis under various environmental conditions.
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