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Title: AQA AS BIOLOGY GAS EXCHANGE - PLANTS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
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When photosynthesis is taking place, (although some
CO2 comes from respiration of cells) most of it is obtained from the external air
...
When plant isn't photosynthesising (in the dark) oxygen
diffuses into the leaf because it is constantly being used
by cells during respiration
...
•
Diffusion takes place in the air = more rapid than water
...
Air spaces inside the leaf have a
very large surface area compared with the volume of living tissue
...
Each stoma (singular) is surrounded by a
pair of special cells (guard cells) that can open and close the stomatal pore
...
Important because terrestrial organisms lose water by evaporation
...
They do this by closing stomata at
times when water loss would be excessive
Title: AQA AS BIOLOGY GAS EXCHANGE - PLANTS
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.