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Photosynthesis (Cells (Root hair cells (Larger surface area absorbs…
Photosynthesis
Cells
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Sieve cells have a large central channel for sugar to flow. They form in the phloem and have holes which allow th sugar to flow into neighbouring cells
Xylem and Phloem are responsible from transporting water, mineral ions and sugars
Root hair cells
- Larger surface area absorbs mineral ions and water faster
- Thin cell walls help with the rate of diffusion
Companion cells are next to the sieve cells and actively pump sucrose in and out of the sieve cells. This allows sucrose to flow up and down the plant
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Pallaside cells are found in the leaves, contain lots of chloroplasts and have large surface area
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Stomata
Stomata open during the day and close at night due to water flowing in and out. They allow gas exchange to occur
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Osmosis :
Diffusion by water through a semi- permeable membrane
Passive process (Doesn't require energy )
Diffusion:
The movement of particles from a high to low concentration
Passive process (Doesn't require energy)
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For photosynthesis to occur you need:
- Carbon dioxide
- Sunlight
- Chlorophyll
- Water
Starch stays in the chloroplast until photosynethsis is complete. The starch is then broken down into simpler substances to be moved around the plant to make sucrose
Uses of sucrose:
- Can be used to make other molecules such as cellulose, lipids and proteins
- Can be used to make glucose for respiration
Limiting factors:
- Temperature
- Carbon dioxide levels
- Light intensity
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Light intensity: I[new] = ( I[orginal] x D²[original] ) x D²[new]
If you double distance, you quarter the light intensity