the glucose produced by photosynthesis is used by the plant for energy (through respiration). it is stored in the plant as starch. this is an endothermic reaction - energy is transferred from the sun to the chloroplast in the plant.
what factors can affect the rate of photosynthesis?how?
temperature - the best temp. is about 30 degrees, anything above 40 degrees will slow photosynthesis down
amount of light - if there is more light photosynthesis happens faster
amount of CO2 - if there is more carbon dioxide photosynthesis will happen quicker
amount of chlorophyll - the more chlorophyll the more photosynthesis
How would you draw a graph for each of these factors: temp, carbon dioxide, light
temperature - increase until 40 degrees
carbon dioxide - increase at first but then draw a straight line (limited by lack of increase in temp or light)
light - increase at first but then draw straight line
define intensity
the strength of the light arriving at a certain points
what is the disadvantage of always using the best balance of temperature and carbon dioxide?
very expensive
how can you keep crops in perfect conditions?
heating
artificial lighting
extra carbon dioxide - gas can be pumped into the air
How can you show that a plant gives off oxygen during photosynthesis?
Using a water plant, collect gas bubbles produced during photosynthesis. The gas will relight a glowing splint as it contains oxygen.
What are examples of lead adaptions which maximise the rate of photosynthesis?
broad leaves - maximise surface area
thin leaves - short diffusion distance
chlorophyll - trap light energy
veins - transport water (xylem), remove photosynthesis products (phloem)
air spaces - allow C02 in and 02 out
guard cells - control opening of stomata for gaseous exchange and prevent water loss
What is a limiting factor?
An environmental factor which can restrict the rate of photosynthesis