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Unit 6: Plant nutrition - Coggle Diagram
Unit 6: Plant nutrition
Photosynthesis
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Definition
the process by which plants make glucose from carbon dioxide and water using light energy as their food source
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Affecting Factors
- the rate of photosynthesis increases with the light intensity up to a certain point
- increasing the concentration of carbon dioxide increases the rate of photosynthesis up to a certain point
- enzymes are catalyzed in the reactions involved in photosynthesis
- water also speeds up photosynthesis because it opens the stomata and allows for more carbon dioxide intake
- more chlorophyll allows for more light absorbed, so it increases the rate of photosynthesis
Leaves
Structure
the epidermis is the protective outer layer, transparent so it allows for light to go through
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the palisade mesophyll is a layer of cells with a lot of chloroplasts, where most of the photosynthesis occurs
the spongy mesophyll is a collection of loosely packed cells with air spaces for ideal gas exchange (diffusion)
stomata is the openings in the leaf for gas exchange (CO₂ in, O₂ out); controlled by guard cells.
the veins (xylem & phloem) transport water and minerals to the leaf and sugars away from the leaf/sink
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