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Learn: Photosynthesis and Leaf Structure
WJEC GCSE in BIOLOGY specification
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Welcome!Today we'll learn about photosynthesis and the structure of leaves. This topic is essential for understanding how plants make food and support life on Earth.
What is Photosynthesis?Photosynthesis is the process by which plants use light energy, carbon dioxide, and water to produce glucose and oxygen. It is vital because it provides energy for plants and oxygen for animals, including humans.
The Photosynthesis EquationThe word equation for photosynthesis is: Carbon dioxide + Water → Glucose + Oxygen. Sunlight and chlorophyll (a green pigment in chloroplasts) are needed for this process.
Quick check: What are the products of photosynthesis?
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Factors Affecting PhotosynthesisThe rate of photosynthesis depends on light intensity, carbon dioxide concentration, and temperature. These are called limiting factors because they can limit how fast photosynthesis occurs.
Which of these factors can limit photosynthesis? (Select all that apply)
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Leaf StructureThe structure of a leaf is adapted to maximise photosynthesis. Key parts include the cuticle (a waxy layer reducing water loss), stomata (tiny openings for gas exchange), and palisade cells (packed with chloroplasts to absorb sunlight).
Match the items on the left with their correct pairs on the right
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Gas Exchange in LeavesLeaves exchange gases through stomata. Carbon dioxide enters for photosynthesis, and oxygen produced during photosynthesis exits. This process is essential for plant and animal life.
The {{blank0}} in leaves allow gases to exchange during {{blank1}}.
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Review Time!Great work! You've learned about photosynthesis, leaf structure, and gas exchange. Now let's test your understanding with a few questions.
Which part of the leaf prevents water loss?
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Select all that are reactants of photosynthesis
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Match the items on the left with their correct pairs on the right
Start the lesson to answer this math equation question
Final ThoughtsWell done! Photosynthesis is key to life on Earth. Plants use their specially adapted leaves to capture sunlight and produce food, supporting ecosystems worldwide.
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