biology-photosynthesis
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- Created by: Sophie Conway
- Created on: 13-02-14 15:17
why is photosynthesis important to plants?
photosynthesis provides plants with the food and energy they need to grow
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what do plants need to carry out photosynthesis?
SUNLIGHT;gives the plant energy. CHLOROPHYLL;green pigment that traps sunlight energy.WATER;travels up the roots in xylem.CO2-enters lead through small stoma on the under side.
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what is produced as a result of the process?
GLUCOSE;leaves the leaf in the phloem. OXYGEN;goes out the leaf through small stoma on the underside
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what is the equation for photosynthesis
carbon dioxide + water ----> glucose+oxygen. 6C02+6H20 ---> C6H1206 +602
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how is the leaf designed to maximise photosynthesis?
wide+flat-to create a large surface area to absorb as much light as pos.Thin-gases can reach cells easy.lots of veins-carry water to cells+glucose away. have holes(stomata)on underside-gases move in and out.
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what happens if no light is present?
photosynthesis will not take place and no starch will be found
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what must happen to the plant before it is used to carry out an experiment to investigate what affects photosynthesis?
destarched.involves keeping the plant in darkness overnight to ensure that any stores of starch are used up before the investigation
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what are the main factors that control the rate of photosynthesis?
amount of light,carbon dioxide and temperature. of one of these is restricted the rate of p will be below the maximum rate possible. restricted factor-called limiting factor+will determine the rate of photosynthesis.
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what is photosynthesis controlled by?
enzymes. these are destroyed at temperatures above 40 degrees.
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name the uses of glucose inside the plant when it has been produced?
made into sucrose.Made into cellulose for cel walls.Made into amino acids-protein-beans.made into starch,food store-potatoes.Reacted with oxygen,releases energy for cells to live+grow(respiration)
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what do green plants use chlorophyll for?
to absorb light energy and convert co2 and water into glucose,producing oxygen as a result
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how may the rate of photosynthesis be decreased?
low temp,shortage of co2,low light intensity.
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what is photosynthesis?
the process by which green plants make food using raw materials from the atmosphere and energy from sunlight. with photosynthesis,no life could exist on the planet.
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which part of the plant does photosynthesis take place?
green parts and mostly in the leaves. green parts contain cells with chlorophyll in their chloroplasts.
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what is a waste product of photosynthesis?
oxygen,which living organisms need for respiration.
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what happens to any excess glucose?
stored in the leaf cells as starch
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how do scientists test if photosynthesis has taken place?
test for starch. if starch is present then photosynthesis has taken place.
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why does water not affect the rate of photosynthesis?
if there is enough water for the plant to survive ,there is plenty for photosynthesis. adding extra makes no difference.
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what is a limiting factor?
the factor that is controlling the rate of photosynthesis at a given time,and the one that will if increased boost the rate. at night-light lf. during day-co2. winter-temp
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describe the testing of leaves for starch
boiling theleaf in alcohol to remove the colour,then staining with iodine,blue black indicates starch
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describe the removal of co2 -experiment
with sodium hydroxide solon,to test the need for co2 in photosynthesis.
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describe using oxygen and co2 sensors-experiment.
to monitor the rate of photosynthesis.
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what does photosynthesis use and produce?
uses:co2 water and energy from sun. produces:oxygen,glucose.
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what is the glucose produced by photosynthesis used for?
by the plant for energy through respiration. It is stored in the plant as starch.
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diagram of a cross section of a leaf
.
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describe maximising growth for farmers
can use knowledge on limiting factors to increase crop growth in greenhouses.may use artificial light so photosynthesis can do daylightt hours or high light intensity.Paraffin lamps increase rate of p bc burning of paraffin produces co2 and heat too.
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finished:)X
x
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Other cards in this set
Card 2
Front
what do plants need to carry out photosynthesis?
Back
SUNLIGHT;gives the plant energy. CHLOROPHYLL;green pigment that traps sunlight energy.WATER;travels up the roots in xylem.CO2-enters lead through small stoma on the under side.
Card 3
Front
what is produced as a result of the process?
Back
Card 4
Front
what is the equation for photosynthesis
Back
Card 5
Front
how is the leaf designed to maximise photosynthesis?
Back
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