IGCSE Biology : Gas Exchange Topic Materials
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10 Terms
Leaves
Essential organs for photosynthesis, absorbing sunlight energy.
Chloroplasts
Contain chlorophyll for absorbing sunlight in photosynthesis.
Photosynthesis Equation
sunlight + carbon dioxide + water → oxygen + glucose.
Adaptations of Leaves
Flat and thin with large surface area for sunlight and carbon dioxide absorption.
Vessels (xylem and phloem)
Transport water, minerals, and glucose within plants.
Guard Cells
Regulate gas exchange through stomata, opening and closing as needed.
Factors Affecting Photosynthesis
Temperature, light intensity, and carbon dioxide concentration.
Practical Investigations in Photosynthesis
Using Elodea for observing oxygen bubbles, experimenting with light intensity, and testing carbon dioxide effects.
Starch Production
Indicates photosynthesis occurrence, tested with iodine solution on leaves.
Stomata Function
Small openings on leaf undersides regulating water loss and gas exchange.
