B1.4 - Photosynthesis Flashcards
What is the word equation for photosynthesis?
Carbon dioxide + water -> glucose + oxygen + energy
Is photosynthesis exothermic or endothermic?
Endothermic - taking energy in from the surroundings
What is the definition of an endothermic reaction?
Taking in energy from the surroundings
Where does photosynthesis mainly occur?
The leaves
Why are leaves and stems green?
They contain the pigment chlorophyll in the chloroplasts
What is the light dependent stage of photosynthesis?
Energy transferred from light splits water molecules into oxygen, gas and hydrogen ions
What is the light independent stage of photosynthesis?
Co2 gas combines with the hydrogen to make glucose
True or false?
Plants respire 24 hours
True
What is the chemical formula for glucose?
C6H12O6
True of false?
Plants photosynthesise 24 hours a day
False, it depends on sunlight
What is the law of limiting factors?
When a process is dependent on multiple factors, the rate of that process is limited by the factor which is in shortest supply
What are the potential limiting factors for photosynthesis (5)?
Light intensity
Availability of water
Availability of co2
Availability of chlorophyll
Temperature
What is the inverse square law?
Light intensity is inversely proportional to the square of the distance from the light source
What is the formula for relative light intensity?
Light intensity (inversely proportional) 1/(distance from light source squared)
True or false
Photosynthesis can continue at temperatures below 0 degrees Celsius
False
