PhotosynthesisOxford AQA IGCSE Biology: Flashcards

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Write the word equation for photosynthesis.

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Write the word equation for photosynthesis.: Carbon dioxide + water → glucose + oxygen (in the presence of light)
Write the balanced symbol equation for photosynthesis.: $\ce{6CO2 + 6H2O -> C6H12O6 + 6O2}$ , with light energy
What is chlorophyll?: The green substance that absorbs light for photosynthesis
Where is chlorophyll found?: In chloroplasts, in some plant cells and in algae
What happens to the light absorbed during photosynthesis?: It is used to convert carbon dioxide and water into glucose
Where do the carbon dioxide and water for photosynthesis come from?: Carbon dioxide from the air; water from the soil
What is the by-product of photosynthesis?: Oxygen
Which leaf tissue carries out photosynthesis?: The palisade mesophyll
How does carbon dioxide enter a leaf?: By diffusion through the stomata
Name three factors that may limit the rate of photosynthesis.: Low temperature, shortage of carbon dioxide and shortage of light
What is a limiting factor?: The factor in shortest supply, which stops the rate of photosynthesis from increasing even if the others are increased
Why can a greenhouse grower increase crop yield?: By enhancing temperature, carbon dioxide concentration and light intensity so that photosynthesis is faster
Why must growers consider the economics of enhancing greenhouse conditions?: The cost of heating, carbon dioxide and lighting must be less than the value of the extra crop produced
List five ways the glucose from photosynthesis can be used.: Respiration; converted into insoluble starch; made into fat or oil for storage; made into cellulose for cell walls; made into proteins
Which ions do plants need to make proteins, and where do they come from?: Nitrate ions, absorbed from the soil
How could you investigate the effect of light intensity on the rate of photosynthesis?: Place pondweed in water at different measured distances from a lamp and count the bubbles of oxygen released in a set time, keeping other variables constant