PHOTOSYNTHESIS
- Created by: Chelsey`Johnson
- Created on: 22-05-16 12:00
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- PHOTOSYNTHESIS
- PHOTOSYNTHESIS
- chlorophyll in chloroplasts absorb sunlight, using its energy to convert carbon dioxide and water into glucose
- converts light energy into chemical energy which is stored in glucose
- carbon dioxide + water -> glucose + oxygen (+ energy)
- 6CO2 + 6H2O -> C6H12O6 + 6O2
- LEAVES
- waxy cuticle
- reduces water loss by evaporation and acts as a barrier
- palisade mesophyll cells
- near top of leaf and contain many chloroplasts
- upper epidermis
- transparent: light can pass through to palisade layer
- broad
- large SA
- xylem cells
- deliver water and nutrients to photosynthesising cells
- phloem cells
- carry sucrose away from leaf to rest of plant
- lower epidermis
- contain stomata, which air passes through to bring carbon dioxide to photosynthesising cells
- spongy mesophyll
- contains chloroplasts & many air spaces -> carbon dioxide can diffuse to palisade mesophyll cells
- waxy cuticle
- LIMITING FACTORS
- light
- increase of light = steady increase of photosynthesis
- once it no longer has an effect, either carbon dioxide or temp is a limiting factor
- temperature
- increase of temp = increase in photosynthesis
- too high (45), enzymes denature and rate rapidly decreases
- carbon dioxide
- increase in concentration= increase in photosynthesis
- more in night: no photosynthesis an less absorbed by plants
- light
- MINERAL IONS
- nitrates
- contain nitrogen for animo acids and proteins
- lack of this = stunted growth and yellow older leaves
- needed for cell growth
- magensium
- needed for making chlorophyll
- lack of this = yellow leaves
- nitrates
- PHOTOSYNTHESIS
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