IGCSE Biology : Gas Exchange Topic Materials

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Leaves

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Essential organs for photosynthesis, absorbing sunlight energy.

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Chloroplasts

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Contain chlorophyll for absorbing sunlight in photosynthesis.

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10 Terms

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Leaves

Essential organs for photosynthesis, absorbing sunlight energy.

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Chloroplasts

Contain chlorophyll for absorbing sunlight in photosynthesis.

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Photosynthesis Equation

sunlight + carbon dioxide + water → oxygen + glucose.

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Adaptations of Leaves

Flat and thin with large surface area for sunlight and carbon dioxide absorption.

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Vessels (xylem and phloem)

Transport water, minerals, and glucose within plants.

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Guard Cells

Regulate gas exchange through stomata, opening and closing as needed.

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Factors Affecting Photosynthesis

Temperature, light intensity, and carbon dioxide concentration.

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Practical Investigations in Photosynthesis

Using Elodea for observing oxygen bubbles, experimenting with light intensity, and testing carbon dioxide effects.

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Starch Production

Indicates photosynthesis occurrence, tested with iodine solution on leaves.

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Stomata Function

Small openings on leaf undersides regulating water loss and gas exchange.