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What would be the reaction to show that glucose (C6H12O6) is being |
synthesized? Write down a balanced equation to show this. |
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(Refer the lessons Chemical equations, Carbon and its compounds in |
your textbook of physical science class X). |
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2 X Class Nutrition - Food supplying system |
Van Neil first worked on purple sulphur bacteria and found light plays a specific |
role in photosynthesis. Instead of H2O they used H2S as a starting material. Here no |
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A |
oxygen is liberated during photosynthesis instead, elemental sulphur is evolved. Later |
he envisioned a similar process of photosynthesis in plants and proposed the above |
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mentioned equation. Later Robert Hill showed that O2 is released from water during |
this reaction. Then the equation was modified as follows. |
Light |
6CO2 + 12H2O C6H12O6 + 6H2O + 6O2 |
Chlorophyll |
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It is known that plants synthesize carbohydrates, the smaller simpler |
ones first and from them, the more complex ones like starch and cellulose. |
Plants are also capable of synthesizing all other compounds like proteins, |
fats etc. |
Animals are not capable of synthesizing carbohydrates and they have |
to depend on plants for the same. |
LA |
Can we state that photosynthesis is the basic energy source for most |
of the living world? Why, why not? |
Let us study how the plants prepare carbohydrates through |
photosynthesis. |
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Activity-1 |
Presence of starch (a type of carbohydrate) in leaves |
Let us take a leaf from a plant with soft and thin leaves and well exposed |
to sun light. |
T |
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Arrange apparatus as shown in figure 2 (a). Take methylated spirit in a |
test tube and put the leaf in it. |
ER |
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beaker |
boiling water |
leaf iodine solution |
methylated spirit |
SC |
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boiling tube |
petridish |
asbestos gauze |
tripod stand |
bunsen burner |
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fig-2(a): boiling the leaf fig-2(b): Iodine test |
in methylated spirit |
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Free distribution by T.S. Government 2019-20 3 |
First boil the leaf in water then transfer this leaf into a test tube |
containing methylated spirit. Boil this tube in a water bath. Chlorophyll |
dissolves in spirit and the leaf becomes pale, due to removal of chlorophyll. |
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A |
Take the leaf carefully from test tube by using a brush. |
Spread the leaf in a petridish and add a few drops of iodine/ betadine |
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AN |
solution on it. Observe the leaf. |
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