What is the role of light energy in photosynthesis
it is abosrbed by the chlorophyll and means that plant can photsynthesise as much as possible. It converts carbon dioxide and water into glucose
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the role of chloroplats
absord light energy
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role of mitochondria
oxygen is used and most of the enrgy is released in respiration
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role of ribosomes
where protein synthesis takes place and all proteins are made
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role of the cell wall
gives the cell support
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role of the vacuole
filled with cell sap and keeps the cell rigid
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limiting factors
light, temperature and carbon dioxide
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how can farmers use their knowledge of limitng factors to help growth
grow crops in greenhouses and use paraffin lamps because they produce carbon dioxide and heat
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why is temperature a limiting factor
enzymes denature if it gets too hot so the reaction can't take place
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why is carbon dioxide a limiting factor
it is needed to make glucose so increasing carbon dioxide increases photosynthesis
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how to test a leaf for starch
1. boil the leaf to kill it and stop and chemical reactions 2.put the leaf in a test tube of ethanol in a beaker of hot water for five minutes 3.take th eleaf out and wash it 4.put iodine solution on the leaf and see if a black-blue colour appears
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how does a plant use glucose
respiration,for starch, produce fats or oils for storage, produce fats,proteins or cellulose for use in the cell and cell walls
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why is some glucose converted into starch
starch is insoluble unlike glucose so it will have no effect on the water balance of the plant
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what are the benfits of artifically controlling the environment we grow our food in
get food all year round, there is a higher yield and they will be ripe earlier
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what are stomata
holes in leaves which gases diffuse in and out of
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what is the stomata formed by
two highly specialized epidermis cells called guard cells
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what is transpiration
water leving the plant through the stomata
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why do the stomata open
carbon dioxide can diffuse in and oxygen out
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why do the stomata close
at night or when its humid to stop gases diffusing in and out of the leaf
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what do plants need to make chlorophyll
magnesium
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what is the hydroponics system
plants grown in water with a perfect balance of mineral ions
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what are the benefits of hydroponics
turnover is fast, crops are unspoilt, there is no ploughing the land and they can grow crops wher land is poor
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Other cards in this set
Card 2
Front
where are chloroplasts s in a leaf
Back
palisade cells
Card 3
Front
word equation
Back
Card 4
Front
chemical equation
Back
Card 5
Front
What is the role of light energy in photosynthesis
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