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Bio - bioenergetics

Biology - Bioenergetics

QuestionAnswer
What process do plants use to make food (glucose)? photosynthesis
What are 3 limiting factors for photosynthesis? light intensity, carbon dioxide concentration & temperature
Why is light essential for photosynthesis? it provides energy
What does the 'waxy cuticle' of a leaf do? lets light through and stops the leaf becoming water logged
What does the 'palisade layer' of a leaf do? its cells have lots of chloroplasts so can carry out lots of photosynthesis
What does the 'spongy mesophyll layer' of a leaf do? creates large air spaces within the leaf
What do the 'guard cells' of a leaf do? open & close the air holes on the underside of the leaf to control the rate of transpiration
What do the air spaces in a leaf do? allow carbon dioxide into the leaf and lets oxygen out of the leaf
What do the 'phloem' cells of a leaf do? carry away glucose
What do the 'xylem' cells of a leaf do? hollow tubes that transport water & minerals from the roots to the leaves to increase the rate of photosynthesis
Metabolism all the chemical reactions that happen inside an organism
What is the equation for photosynthesis? carbon dioxide + water -> glucose + oxygen
Endothermic reaction a reaction where energy is TAKEN IN
Diffusion Spreading out of particles from an area of high concentration to an area of low concentration
Chloroplast where photosynthesis takes place
Chlorophyll Green chemical inside chloroplast
What does chlorophyll do? absorbs energy from light to enable photosynthesis to take place
Stomata tiny holes in leaves
What do 'stomata' do? open & close to control gas exchange and allow carbon dioxide in from the air
What to plant roots do? allow water to enter the plant
Uses of glucose • Used in respiration to provide energy • Converted into starch for storage • Converted into fats & oils for storage • Produce cellulose to strengthen cell walls • Produce amino acids to make proteins
Oxygen • Formed as the waste product of photosynthesis • Some used as plant respiration • Some released for respiration to animals
Ways to measure the rate of photosynthesis • Rate of oxygen output • Rate of carbon dioxide uptake • Rate of carbohydrate production
Limiting factor The factor that stops the rate of photosynthesis increasing
Factors that can affect the rate of photosynthesis • Light intensity • Carbon dioxide concentration • Temperature • Amount of chlorophyll
Created by: samfitter
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