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AQA GCSE 9-1 Biology Photosynthesis topic summary
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A summary of the AQA GCSE Biology specification for the photosynthesis topic.
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Photosynthesis is an endothermicreaction. It takes in light energy If the amount of chlorop
from the sun. is limited in any way, less
photosynthesis will take
During photosynthesis, energy is
transferred from the environment Plants need carbon dioxi
to the chloroplast by light. It is atmosphere to photosyn
As the temperature rises, the rate of photosynthesis atmosphere is only abou
used to convert carbon dioxide and increases as the reaction speeds up. However, if the
water into sugar (glucose). Oxygen carbon dioxide, so this is
temperature gets too high, the enzymes controlling factor of the rate of phot
is also formed and released as a by- photosynthesis are denatured and the rate of
product. photosynthesis will fall.
Plants and algal cells use the gl
Leaves are well adapted to allow produced during photosynthes
the maximum amount of Photosynthesis
respiration, to convert into inso
photosynthesis to take place. They for storage ( for when it is dark
include adaptations like: The factors that limit the rate of photosynthesis
are low), to produce cellulose t
- Size/broadness. interact and any one of them may limit
cell walls, and to produce amin
- Thin so diffusion distances for gas photosynthesis.
protein synthesis.
is short.
- Guard cells that open and close Limiting factors are important in the economics of
Plants and algal cells also need
the stomata to regulate gas enhancing the conditions in greenhouses to gain
absorbed from the soil or wate
exchange. the maximum rate of photosynthesis, while still
amino acids used to make prot
- Air space that allow carbon maintaining profit.
dioxide to get to the cells, and
oxygen to leave by diffusion. HYDROPONICS: The act of controlling all the
- Chlorophyll in the chloroplast to limiting factors, so a plant can have the fastest rate
absorb light. of photosynthesis, and grow as quickly as possible.
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