Oxygen diffuses into the leaf as it is being used by cells during respiration.
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How is the diffusion gradient in and out of the leaf maintained?
Mitochondria carrying out respiration and chloroplasts carrying out photosynthesis.
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Why is diffusion fast?
No living cell is far from the external air, therefore a source of oxygen and carbon dioxide. Diffusion takes place in the gas phase.
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What are the adaptations of leaves for rapid diffusion?
A thin flat shape that provides a large surface area and thin diffusion pathway. Many small pores (stomata) and numerous interconnecting air spaces that occur throughout the mesophyll(for efficient photosynthesis).
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What do the guard cells do?
Surround the stomata, which open and close the pore, they can control the rate of gaseous exchange.
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Why are the guard cells important?
Because terrestrial organisms lose water by evaporation.
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Other cards in this set
Card 2
Front
How is the diffusion gradient in and out of the leaf maintained?
Back
Mitochondria carrying out respiration and chloroplasts carrying out photosynthesis.
Card 3
Front
Why is diffusion fast?
Back
Card 4
Front
What are the adaptations of leaves for rapid diffusion?
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