Plants Flashcards
Photosynthesis
Conversion of light energy to chemical energy
Basis of all food chains
Production of complex organic compounds from simple inorganic compounds
6CO2+6H2O=>C6H12O6+6O2
Factors that affect rate of photosynthesis
Light
CO2
Temp
How light affects photosynthesis
Increase light, increase rate up to a point
Only a certain amount of chloroplasts
Too much light, increased transpiration
Too much water loss leads to stomata closing, p stops as too much UV damages plants
How CO2 affects rate of photosynthesis
Increase CO2, increase p up to a point
Amount of CO2 is fixed at 0.04%
Greenhouses can be pumped with CO2
How temp affects rate of photosynthesis
Higher temp, increased rate of p
If above 40C, rate decreases, enzymes denature
Features CO2 diffuse from air into chloroplasts
Open stomata, CO2 diffuses in
Air spaces in spongy mesophyll
LSA
Feature of leaf for sunlight to get into palisade cell
Transparent upper epidermis
Tightly packed palisade cells full of chloroplasts
LSA
Adaptations of leaf
LSA Thin leaves Leaves on leaf stalk Waxy cuticle Stomata Transparent upper epidermis Palisade layer with elongated cell Spongy mesophyll with air spaces Vascular tissue close by
LSA of leaf
More sunlight absorption
Thin leaves
Shorter distance for light, water and CO2 to travel
Leaves grow on leaf stalk
Orientate themselves for max light absorption
Waxy cuticle
Waterproof
Barrier to microbes
Reduce water loss by evaporation
Stomata
Gas exchange
Transparent upper epidermis
Allows light through to palisade cells
Palisade layer with elongated cell
Tightly packed
Full of chloroplasts
Chloroplasts can move in cell
Spongy mesophyll with air spaces
Gas exchange between atmosphere and leaf cells
Vascular tissue close by
Transport of water to cells from root
Transport of products of photosynthesis away from leaf