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Learn: Photosynthesis
WJEC GCSE in BIOLOGY specification
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Welcome!Today we'll learn about photosynthesis. It's an essential process that allows plants to make their own food using light energy. Let’s explore how it works step by step!
What is Photosynthesis?Photosynthesis is the process by which green plants use sunlight to produce glucose and oxygen from carbon dioxide and water. It happens in the chloroplasts of plant cells, where chlorophyll absorbs light energy.
Why is Photosynthesis Important?Photosynthesis is vital because it provides energy for plants and oxygen for animals and humans to breathe. Without it, life on Earth would not exist as we know it.
Quick check: What are the products of photosynthesis?
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The Photosynthesis EquationThe word equation for photosynthesis is: carbon dioxide + water → glucose + oxygen, using light energy and chlorophyll. Plants absorb carbon dioxide from the air and water from the soil to complete this process.
The {{blank0}} in plant cells absorbs light for photosynthesis, and {{blank1}} is produced as a waste product.
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Conditions for PhotosynthesisPhotosynthesis requires light, carbon dioxide, and water. It is also affected by factors like temperature, light intensity, and carbon dioxide concentration. These are called limiting factors.
Which factors can limit the rate of photosynthesis? (Select all that apply)
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Leaf Structure and AdaptationsLeaves are adapted for photosynthesis. They have a large surface area to absorb light, thin structure for gas exchange, and chloroplasts containing chlorophyll.
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Glucose Use in PlantsPlants use glucose for respiration, to make cellulose for cell walls, and to store energy as starch. It can also be converted into proteins and oils for growth and storage.
Review Time!Great work! You've learned about photosynthesis, its equation, conditions, and adaptations. Let’s test your knowledge now.
Where does photosynthesis occur in plant cells?
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What are the uses of glucose in plants? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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The word equation for photosynthesis is: {{blank0}} + water → {{blank1}} + oxygen.
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