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List as many words as you can that relate to
respiration in a spider diagram.
◦ Recall that the process of respiration releases energy in
living organisms
◦ Describe the differences between aerobic and anaerobic
respiration
◦ Recall the word equation and the balanced chemical symbol
equation for aerobic respiration in living organisms.
◦ Recall the word equation for anaerobic respiration in plants
and in animals
◦ Describe simple controlled experiments to demonstrate the
evolution of carbon dioxide and heat from respiring seeds
or other suitable living organisms.
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Cells get their energy from food.
The energy is released from the food by a
process called respiration.
In respiration glucose is combined with
oxygen to release energy.
Carbon dioxide and water are formed.
This happens inside the mitochondria of the
cell.
Oxygen
H2O
Energy
carbon dioxide
glucose
C6H12O6
CO2
water
O2
Energy
Word equation
C6H12O6 + 6O2
Symbol
equation
6CO2 + 6H2O
+ Energy
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Active transport
Moving things around the cell
Muscle contractions
Transmitting nerve impulses (if in a nerve
cell).
Some released in the form of heat (keep body
temperature constant).
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This is the type of respiration that releases
energy by combining glucose with oxygen.
Hence why its called aerobic respiration!
Because it uses air which contains oxygen.
However…..it is possible to release energy
from sugar without using oxygen.
What type of respiration is this?
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This type of respiration releases energy from
glucose without oxygen.
Anaerobic respiration (‘an’ means without).
Disadvantages of it:
 Less efficient than aerobic respiration
 Doesn’t produce as much energy as aerobic
respiration.
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Yeast is a single celled fungus.
It respires anaerobically.
It breaks down sugar to alcohol.
Glucose
alcohol + carbon dioxide + energy
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Some cells in our bodies respire anaerobically
for a short while (especially in our muscle
cells).
They make lactic acid instead of alcohol.
Glucose
lactic acid + energy