photosynthesis Flashcards
what is photosynthesis
the process by which plants synthesise glucose using light energy from the sun. Light energy is converted into chemical energy
where does photosynthesis take place
withtin chloroplasts in leaf palisade cells. they contain chlorophyll, a pigment which absorbs light energy
state the equation for photosynthesis
carbondioxide+water-light-glucose+oxygen
6CO2+6H2O-light-C6H12O+6O2
is photosynthesis an endothermic or exothermic reaction , and why
Endothermic- energy is transferred from the environment to chloroplasts by light
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
give examples of leaf adaptations which maximise the rate of photosynthesis
.broad leafs-maximise surface area
.thin leaves-short diffusion distance
.chlorophyll present-trap light energy
.veins-transport water to leaves via xylem
.air spaces-allow co2 to enter and o2 to leave
.guard cells- control opening of stomata for gaseous exchange and prevent water loss
what are the 4 main factors that affect the rate of photosynthesis
.temperature
.light intensity
.carbon dioxide concentration
.Amount of chlorophyll
how does temperature affect the rate of photosynthesis
increasing the temperature increases the rate of photosynthesis as the kinetic energy of particles is increased.
the rate decreases past a certain temperature as enzymes become denatured
how does late intesity affect the rate of photosynthesis
increasing the light intensity increases the rate of photosynthesis until another factor becomes limiting.
how does carbon dioxide concentration affect the rate of photosynthesis
increasing the carbon dioxide concentration increases the rate of photosynthesis until another factor becomes ilmitng.
As CO2 is required to make glucose.
how does the amount of chlorophyll affect the rate of photosynthesis
decreasing the amount of chlorophyll decreases the rate of photosynthesis.
As chlorophyll is required to absorb light energy.
what is a limiting factor
An environmental factor which can restrict the rate of photosynthesis , eg light intensity.
explain how you could calculate the rate of photosynthesis by measuring oxygen production
.set up a bubble potometer (pondweed in a sealed tube of water,attatched to a capillary tube and gas syringe)
.oxygen gas produced causes the bubble in the capillary tube to move.The distance moved by the bubble is used to calculate the volume of oxygen produced.
state 5 uses of glucose produced using photosynthesis
.respiration
.starch for storage
.Amino acids and protien synthesis
.lipids for energy storage in seeds
