Performance and acitivity to show that sunlight is necessary for photosynthesis and varite down the abservation
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Requirements : A potted plant, black paper, alcoho, papaer clips, beakers, iodine solution, water bath.
Procedure :
(1) Place a potted plant in dark for 72 hours for destarching.
(2) Attach a light proof black paper strips on both sides of the leaf with the help of paper clips as shown in the figure.
(3) Place the plant in sunlight for 3-4 hours. Pluck the experimental leaf, remore black paper strips.
(4) Perform starch test by boiling leaf first in boiling water followed by boiling in alcohol over a water bath and then rinsing with cold water and again placing it in iodine solution.
Observation : Only that portion of the leaf changes into blue-black which was not covered. The covered portion of the leaf does not give starch test.
Conclusion : The covered portion of leaf was not receiving any sunlight. Hence, no photosynthesis occurred in that portion and no stach was formed. Due to this reason, only uncovered portion showed the starch test and not the covered portion.
Result : The above experiment shows that sunlight is necessary for photosynthesis.
Procedure :
(1) Place a potted plant in dark for 72 hours for destarching.
(2) Attach a light proof black paper strips on both sides of the leaf with the help of paper clips as shown in the figure.
(3) Place the plant in sunlight for 3-4 hours. Pluck the experimental leaf, remore black paper strips.
(4) Perform starch test by boiling leaf first in boiling water followed by boiling in alcohol over a water bath and then rinsing with cold water and again placing it in iodine solution.
Observation : Only that portion of the leaf changes into blue-black which was not covered. The covered portion of the leaf does not give starch test.
Conclusion : The covered portion of leaf was not receiving any sunlight. Hence, no photosynthesis occurred in that portion and no stach was formed. Due to this reason, only uncovered portion showed the starch test and not the covered portion.
Result : The above experiment shows that sunlight is necessary for photosynthesis.
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