Revision Summary for Photosynthesis


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Revision Summary for Biology 2: Photosynthesis
You should know and understand the following:
· Light energy is absorbed by the pigment, chlorophyll, in the
chloroplasts of green plants.
· This energy is then used by plants to convert carbon dioxide and
water into sugars; oxygen being released as a waste product.
· Some of the sugars produced are used by the plant in the process of
respiration to make energy available to the plant.
· Some of this energy is used to build up smaller molecules into large
· Some of the sugars produced are used to build up biological
molecules, and excess sugars are converted into starch for storage.
· Plants need mineral ions (salts) for healthy growth. They gain these
from the soil by absorbing them into their roots.
· Lack of essential mineral ions results in plants developing
deficiency diseases such as yellow leaves when magnesium is
lacking and stunted growth when nitrates are absent.
· Magnesium is needed to make the chlorophyll molecule. Nitrates are
needed to build proteins (and DNA).
· The rate of photosynthesis is affected by temperature and by the
availability of light and carbon dioxide.
· The environment in which plants grow can be manipulated
artificially to grow more food.
You should be able to use your knowledge of how Science works to do
the following:
· Interpret data showing how factors affect the rate of photosynthesis.
· Evaluate the benefits of artificially manipulating the environment in
which plants are grown.
CEM Oct 2007

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Revision Summary for Biology 2: Energy Flows
You should know and understand the following:
· Solar radiation is the original source of energy for all living
organisms. It is captured by green plants and used to build up energy
stores in their cells (biomass).
· Pyramids of energy show how the amount of biomass is reduced at
each stage along a food chain.…read more

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