Revision Cards on Photosynthesis, limiting factors, starch test and mineral deficiencies

Revision Cards on Photosynthesis, limiting factors, starch test and mineral deficiencies. Used for AQA GCSE Biology (B2). 

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Photosynthesis is the making of Light Energy is absorbed by
glucose and other complex chlorophyll. It is the chlorophyll The word equation is:
organic chemicals using light which makes plants look green.
Carbon Dioxide + Water
energy and simple inorganic Light energy is used to convert Chlorophyll
chemicals such as carbon dioxide carbon dioxide and water into ------>
> Glucose + Oxygen
Light energy
and water. glucose. Oxygen is also released.
Carbon Dioxide limits the rate of
Temperature limits the rate of
Leaves are the main site of photosynethesis as less carbon
photosynthesis as a lower
photosynthesis, in the pallisade dioxide mean less reactants are
temperature means enzymes
and spongy cells. These cells are available for the reaction. The
work more slowly. At a higher
packed with chloroplasts which amount of CO2 will only increase
temperature, enzymes will
contain chlorophyll. the rate of photosynthesis up to a
become denatured.
certain point.
In a starch test, iodine is added to Farmers can manipulate the
Light Intensity limits the rate of
a leaf or potato. If this area turns environment plants are grown in.
photosynthesis as less light means
from an orange/yellow colour to a Plants can be grown in
less energy to power the reaction.
dark blue/black colour, then greenhouses where temperature
The rate of photosyntheseis only
amylase is present in the form of can be controlled, alongside light
increases up to a certain point,
starch. If no amylase is present, and carbon dioxide levels. Also
after this, either temperature or
the iodine will remain fertilisers can be given to provide
CO2 needs to be increased.
orange/yellow. essential minerals for the plants.
Plants can use gluscose for Plants use glucose by converting it
This results in plants being able to
respiration, which releases energy into cellulose and making it for
grow at a faster rate and being
enabling the plants to build new cell walls. Also, glucose combines
grown out of theis natural growth
cells and grow. Also use glucose with nitrates to make amino acids
season. Therefore, farmers can
for making fruits, which store the which are then made into
increase their profits.
sugar sucrose. proteins.
Glucose can be turned into lipids Magnesium is needed to make
Nitrates are used to make amino
for storage in seeds. Glucose is chlorophyll, which is needed for
acids, which then go on to make
also converted into starch and photosynthesis. A lack of
proteins. A lack of nitrates means
stored. It is better for storage as it magnesium could mean plants'
the plant shows stunted growth.
is insoluble. It is usually stored in leaves could turn tellow. This is
This is because proteins are
roots, stems and leaves, ready to because magnesium is need to
needed for new growth, and they
use for when photosynthesis isn't make chlorophyll, which gives a
cannot be made without nitrates.
happening. plant its green colour.
Potassium and phosphates are
also used to make DNA and cell
membranes, and helping enzymes
to work properly. Any shortage of
minerals in plants could lead it to


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