photosynthesis Flashcards
word equation for photosynthesis
carbon dioxide + water =(light)= glucose + oxygen
CO2+ H20 = C6H1206 + O2
explain how to produce glucose molecules by photosynthesis
energy is required
this is because the reactions are endothermic
the energy needed is supplied by sunlight
it is trapped in chlorophyll which is found in chloroplasts
what is the factor that stops the reaction going any faster
limiting factor
what are the limiting factors in photosynthesis
temperature
carbon dioxide concentration
light intensity
chlorophyll concentration
how is temperature a limiting factor
as the temperature increases, so does the rate of photosynthesis
this is because more energy us provided for the reaction
as the temperature approaches 45 degrees the rate of photosynthesis drops to zero because the enzymes controlling photosynthesis have denatured
How is carbon dioxide concentration a limiting factor of photosynthesis
as the concentration of co2 increases so does the rate of photosynthesis
this is because co2 is needed in the reaction
after reaching a certain point, an increase in co2 has no further effect. co2 is no longer the limiting factor
how is light intensity a limiting factor of photosynthesis
as light intensity increases so does the rate of photosynthesis
this is because more energy is provided for this reaction
after reaching a certain point an increase in light has no further effect. it is no longer the limiting factor
how is chlorophyll concentration a limiting factor
this does not vary in the short term but may change if plants are grown in soil without enough minerals to make chlorophyll
how can we find out the limiting factor
by looking at a graph, it is possible to say what the limiting factor is at any point
how can we increase the rate of photosynthesis
greenhouse gases can be used to increase the rate of photosynthesis. By controlling light temperature and carbon dioxide, farmers can increase the growth rate of their crops
when is glucose used by the plant
the glucose produced in photosynthesis may be used by the plant during respiration to provide energy
what other products may glucose be changed into
insoluble starch, which is stored in the stem, leaves or roots
fat or oil, which is also stored
cellulose, to strengthen cell walls
proteins which are used for growth and for enzymes
how are proteins produced from glucose
to produce proteins from glucose, plants also use nitrate ions, which are absorbed from the soil
investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pondweed
place a piece of pondweed in a beaker and shine a light at it using a lamp a specific distance away
record the number of bubbles of gas coming out of the pondweed in one minute
repeat this with the lamp at different distances from the pond weed
hazards and risks with photosynthesis required practicle
care must be taken to avoid any water being dropped onto the hot light bulb
