Write an activity to show that leaves prepare food for the plant for students of class 6
Answers
Answer:
photosynthesis is a process of making of foods in plants in this process plant take sunlight and water and co2 and make their own food with the help of leaves.
Explanation:
- the Reaction is
- 6CO2 + 12H2O --------> C6H12O6 + 6H2O + 6O2
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Explanation:
Activity -
Aim : To show that food is prepared in a green leaf during photosynthesis.
Materials required : Green leaves , alcohol , iodine
1) Pluck a green leaf from a plant which has been kept in sunlight .
2) Boil the leaf for five minutes and place it in spirit ( alcohol ) . Mark it as ' A '.
3) Pluck another green leaf from a potted plant which has been kept in total darkness for about 24 minutes.
4) Boil the leaf for about 5 minutes and place it in spirit ( alcohol ) . Mark it as ' B '.
5) ( Boiling makes the walls of the cell in a leaf permeable. Chlorophyll being soluble in alcohol ( not in water ) comes out of the boiled leaves turning alcohol green and leaving behind colourless ( decolourised ) non-green leaves .
6) Now, test both the leaves with 'Starch iodine test' by dropping a drop of dilute iodine solution on each leaf .
Observations :
The leaf 'A' turns blue-black showing it has starch in it . The leaf 'B' remains colourless showing that it has no starch in it .
During night ( or in dark ), starch from the leaf is reconverted to sugar and sugar solution is translocated ( shifted ) to the other parts of the plant body leaving behind the leaf without any starch in it. The leaf is destarched. Hence the leaf ' B ' shows the absence of starch from it .
Conclusion :
( i ) Photosynthesis takes place and food is prepared in a green leaf in the presence of light. This food is initially stored as starch in a leaf hence the leaf ' A ' shows the presence of starch in it. This experiment also demonstrates that light is necessary for photosynthesis.
( This activity shows that how food is prepared in a green leaf for class 6 )