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Animal cells do not have cells walls, only membranes
Organised cells
Diffusion is the net movement of particles from an area where they are at a high
concentration to an area where they are at a low concentration. If there is a big
difference in concentration, the rate of diffusion will increase.…read more

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Carbon dioxide+ Water [+ light energy] Glucose+
Cells in the leaves of the plants contain chloroplast, which contain a green
substance called chlorophyll. Light energy is absorbed by the chlorophyll, and
used to convert carbon dioxide from the air plus water from the soil into glucose.
The reaction produces oxygen gas, which is released into the air.
Limiting factors:
The limiting factor is the factor displayed on the xaxis of the graph. Some
examples are light, temperature and CO2 levels.…read more

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Magnesium Making chlorophyll Pale, yellow leaves
Pyramids of Biomass:
Radiation from the Sun is the source of energy for all chains
Organism Number Biomass
Oak tree 1 500000
Aphids 10000 1000
Lady birds 200 50
Sparrow 5 10
Energy losses:
Waste indigestible parts, faeces, urea (excess broken down protein)
Movement Respiration, muscle contraction when moving
Keeping constant body temperature warm blooded animals control their
temperature and keep it constant
Decomposers are a group of microorganisms such as bacteria and fungi that
feed on waste…read more

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Making use of enzymes:
Biological detergents: proteases and lipases are used to break down the
proteins and fats in the stains
Baby foods: Proteases are used to predigest some of the proteins that a
baby's digestive system cannot cope with
Slimming foods: Isomerase breaks glucose into fructose, which is a lot
sweeter and can be used in smaller amounts to create the same taste.…read more

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