Photosynthesis
Carbon dioxide + water >> glucose + oxygen
CO2 + H2O >SUNLIGHT AND CHLOROPHYLL> C6H12O6 + O2
Controlled by enzymes (quickens up activity) >> metabolic activity
During photosynthesis light energy is converted into chemical energy
absorbed by the chlorophyll. CO2 + H2O is combined to form glucose which
combines to form starch which is stored manly in the leaves.
Plants are autotrophs (forms own food)
External structure of leaf
Main function = photosynthesis
Structure adapted to carry out function
1. Large surface are to catch light
2. Short distance for CO2 to diffuse into thin transparent cells
3. Contains chloroplast
4. Stoma for gaseous exchange
5. Vein >> brings H2O and removes food products
Internal structure of leaf
Epidermis – single outer layer of leaf that secrets a waxy layer
(cuticle) >> prevents H2O loss . Function of epidermis – protects
inner tissue, transparent >> allows for sun to reach chloroplast.
Upper and lower epidermis contains stomata (allows for
gaseous exchange)
Usually more at the bottom to prevent too much water loss (sun
cant evaporate water from the bottom)
Carbon dioxide + water >> glucose + oxygen
CO2 + H2O >SUNLIGHT AND CHLOROPHYLL> C6H12O6 + O2
Controlled by enzymes (quickens up activity) >> metabolic activity
During photosynthesis light energy is converted into chemical energy
absorbed by the chlorophyll. CO2 + H2O is combined to form glucose which
combines to form starch which is stored manly in the leaves.
Plants are autotrophs (forms own food)
External structure of leaf
Main function = photosynthesis
Structure adapted to carry out function
1. Large surface are to catch light
2. Short distance for CO2 to diffuse into thin transparent cells
3. Contains chloroplast
4. Stoma for gaseous exchange
5. Vein >> brings H2O and removes food products
Internal structure of leaf
Epidermis – single outer layer of leaf that secrets a waxy layer
(cuticle) >> prevents H2O loss . Function of epidermis – protects
inner tissue, transparent >> allows for sun to reach chloroplast.
Upper and lower epidermis contains stomata (allows for
gaseous exchange)
Usually more at the bottom to prevent too much water loss (sun
cant evaporate water from the bottom)
