class 9 science ncert activity 6.1 observation
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Answer:
Step 1: Take a potted plant with varied leaves – for instance, honesty or croton.
A varied leaf is employed within the experiment as a result of some half of} the leaf is inexperienced in color whereas some part is non-green. The inexperienced a part of the leaf is green because of the presence of chlorophyl and might perform chemical action. The non-green half doesn't have chlorophyl and therefore, it'll not perform chemical action.
Step 2: Keep the plant in an exceedingly dark area for 3 days in order that all the starch gets exhausted.
The plant is then unbroken within the dark for 2-3 days in order that all the keep food in the style of starch gets exhausted. there's no chemical action within the absence of sunshine and therefore, no any food formation happens.
Step 3: currently keep the plant in daylight for concerning six hours.
The plant is then placed in daylight for six hours to permit chemical action to occur. macro molecule formation happens because of chemical action solely within the inexperienced elements of the leaves.
Step 4: Pluck a leaf from the plant. Mark the inexperienced areas in it and trace them on a sheet of paper.
The leaf containing starch is plucked and marked for inexperienced areas which is able to facilitate United States to match the results obtained any with the iodine check.
Step 5: Dip the leaf in boiling water for jiffy. After this, immerse it in an exceedingly beaker containing alcohol. fastidiously place the higher than beaker in an exceedingly water-bath and warmth until the alcohol begins to boil.
The leaf is treated with alcohol in order that the leaf loses its inexperienced color because of the chlorophyl pigment and takes up the blue black color when treatment with iodine.
Step 6: currently dip the leaf in an exceedingly dilute answer of iodine for some minutes. take away the leaf and wash the iodine answer. Observe the color of the leaf and compare this with the tracing of the leaf wiped out the start. What are you able to conclude concerning the presence of starch in numerous areas of the leaf?
The inexperienced elements of the varied leaf contain chlorophyl. Therefore, solely these elements may photo synthesis and manufacture food (starch). within the presence of iodine, starch reacted with iodine to grant a blueish color. this color development indicates the presence of starch within the leaf and therefore, demonstrates that chlorophyl is important for the method of chemical action.
Explanation:
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