photosynthesis Flashcards
equation for photosynthesis
carbon dioxde+water–(sunlight)–> glucose+oxygen
where does photosynthesis take place in the cell?
chloroplasts
what does chloroplasts do?
absorb sunlight and uses its energy to convert co2 and water into glucose.
where does photosynthesis take place in the plant?
the leaf
what does the limiting factor depend on?
the conditions
what three factors limit the rate of photosynthesis?
light intensity, co2 and temperature
at night what would be the limiting factor?
light
what plant is good to measure the amount of oxygen produced?
canadian pondweed
how would you measure the amount of oxygen produced
count the bubbles given off or collect the ocygen in a gas syringe
how does light slow down the rate?
if there isnt enoughof it
what happens when the light level is increased?
the rate increases up to a certain point then temp of co2 will be the limiting factor.
how can you change the light intensity in a lab?
move the lamp closer/further away from your lamp
how can you measure light intensity?
light meter
how do you control the amount of co2?
dissolve different amounts of sodium hydrogencarboate in the water which gives off co2
if the plan gets too hot what happens
the enzymes needed for photosynthesis denature
what temp does enzymes denature?
45 degrees
how can you control the temp of a flask
put it in a water bath
how to make all the experiments fair?
- use a bench lamp(careful not to block light with anything)
- keep flask in water bath to help keep temp constant
- use large flask and do experiment quickly so it doesnt use up too much of the co2
how does greenhouses make sure the temp doesn’t become limiting?
they help to trap the suns heat. A farmer may also use a heater in winter, in summer he may use shades and ventilation
how do they have light in greenhouses?
artificial light
how do they increase the co2?
paraffin heater to heat the greenhouse-as it burns it makes co2
what does keeping them in a greenhouse help with?
-keeping free from pests and diseases
how do plants use glucose(5)
- respiration:releases energy which enables them to convert the rest of the glucose into other useful substances
- making cell walls:glucose is converted into cellulose
- making proteins:glucose is combined with nitrate ions to make amino acids which are made into proteins
- stored in seeds: glucose is turned into lipids for storing in seeds.
- stored as starch: glucose is turned into starch and stored in roots,stems and leaves. Starch is insoluble so its better for storing than glucose
