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Learn: Photosynthesis and Plant Adaptations
WJEC GCSE in BIOLOGY specification
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Welcome!Today we'll explore photosynthesis and how plants are adapted to carry out this essential process. Let's dive in step by step!
What is Photosynthesis?Photosynthesis is the process by which plants use light energy to convert carbon dioxide and water into glucose and oxygen. It is vital for life because it provides food and oxygen for organisms.
The Photosynthesis EquationThe word equation for photosynthesis is:Carbon dioxide + Water → Glucose + OxygenLight energy, absorbed by chlorophyll in chloroplasts, drives this reaction.
Quick check: What is produced during photosynthesis?
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Plant Adaptations for PhotosynthesisPlants have specialised structures to maximise photosynthesis. The leaf is designed to absorb light and carbon dioxide efficiently.
Leaf StructureKey parts of the leaf include:Cuticle: A waxy layer that reduces water loss.Palisade layer: Contains tightly packed cells with chloroplasts for maximum light absorption.Spongy layer: Loosely packed cells for gas exchange.Stomata: Small openings regulated by guard cells to control gas movement.
Match the items on the left with their correct pairs on the right
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Limiting FactorsPhotosynthesis depends on three main factors:Light intensity: More light increases the rate.Carbon dioxide concentration: Higher levels speed up the process.Temperature: Enzymes involved work best at optimal temperatures.
Which of the following can limit photosynthesis? (Select all that apply)
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Investigating PhotosynthesisScientists use experiments to study photosynthesis. For example, they test leaves for starch to confirm photosynthesis has occurred.
To test for starch in a leaf, we first {{blank0}} the leaf to remove chlorophyll, then add {{blank1}}.
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Review Time!Great work! You've learned about photosynthesis, leaf structure, and limiting factors. Let's review the key concepts now.
Which layer of the leaf contains the most chloroplasts?
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What are the products of photosynthesis? (Select all that apply)
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The {{blank0}} are openings in the leaf that allow gas exchange.
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