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karthikmns
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eval_testing_mns

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bottle containing bicarbonate/indicator solution (or lime water).
During the process of anaerobic respiration some amount of
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carbondioxide is released. The released carbondioxide passes through
the tube and turns lime water milky. We can observe the change in the
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temperature also during this process out for yourself. You may prefer to
carry out the ‘carbon dioxide production’ part of the experiment on a
smaller scale, using test tubes. If you do, then warm them to about 37o C in
order to speed up the test.
What happens when a baker prepares a dough by mixing yeast in it?
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Fermentation
Let us recall maida dough and yeast powder activity that you performed
in class VIII in the chapter ‘The story of microorganisms’. Why volume of
the dough has increased? Which gas released in that reaction?
If yeast and sugar solution are left to stand without oxygen for some
days, they develop a characteristic smell, caused by production of new
compound called ethanol, which has been manufactured by the yeast from
Free distribution by T.S. Government 2019-20 37
the sugar. The same type of smell you can notice from preserved idly,
dosa dough at your home. But not in refrigirator. The ethanol can be
separated from the yeast-glucose mixture by the process of fractional
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distillation since ethanol boils at a lower temperature (70°C) than the sugar
solution. Collect information about fractional distillation with the help
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your teacher.
Quite like aerobic respiration this is a process of producing energy
when there is no supply of oxygen.
Respiration is an energy releasing pathway, do you agree? Justify
your answer.
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Respiration versus combustion
Lavoisier around the late 18thcentury, through a series of carefully
performed experiments, came to the opinion that respiration was a process
like combustion. He wrote in a compilation in 1783, “respiration is a
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combustion process. It is a very slow process and here oxygen is not only
combines with carbon but also with hydrogen.” Robinson also stated that
respiration is a type of combustion and combustion is the source of heat
in animals.
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Activity-2
Activity-2
Observing changes during combustion of glucose
Arrange apparatus as shown in the figure and heat it over a flame.
Does it melt? What happens if you heat for somemore time?
When glucose burns, carbon dioxide and water
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glucose are produced and energy is released as heat.
test tube
We know that combustion of glucose gives us
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carbon dioxide, water and energy while from the
heat delivery
tube respiratory equation we get the same products. But
essentially the processes must differ due to
following reasons.
1. Glucose must be burnt at high temperature in
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the laboratory to liberate energy, if it happened
in our cells,all cells would be burnt.
lime water 2. Once glucose starts burning we can’t stop the
process easily, but living cells are able to exer-