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Before testing the leaf for starch at th...

Before testing the leaf for starch at the end of the experiment, 'light is necessary for photosynthesis', the experimental leaf should be boiled in:

A

Water

B

Alcohol

C

KOH solution

D

Hydrochloric acid

Text Solution

Verified by Experts

The correct Answer is:
B
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Why a leaf must be destarched before starting the experiment showing that light is necessary for photosynthesis ?

Knowledge Check

  • In order to destarch the leaves for an experiment to show that sunlight is necessary for photosynthesis, the:

    A
    leaves are kept in alcohol and boiled in a water bath
    B
    leaves are soaked in iodine for two hours
    C
    plant with the leaves is kept in dark room for 48 hours
    D
    plant with the leaves is exposed to light of a lamp, a night before the experiment

  • For the experiment 'Light is necessary for photosynthesis', the potted plant was first kept in darkness for a day. This is to:

    A
    deactivate chloroplasts
    B
    destarch leaves
    C
    activate chloroplasts
    D
    prepare leaves for photosynthesis

  • A star-shaped figure was cut in the black paper strip used for covering the leaf of a destarched plant used for demonstrating that light is necessary for photosynthesis. As the end of the experiment when the leaf was tested for starch with iodine, the star-shaped figure on the leaf was found to be:

    A
    colourless
    B
    green in colour
    C
    brown in colour
    D
    blue-black in colour

    • Similar Questions

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    Starch in a green leaf after photosynthesis

    Out of the following figures, choose the one showing the correct procedure for removing chlorophyll from the leaf in the experiment 'light is necessary for photosynthesis': The correct procedure is:

    Molls half-leaf experiment proves that___ is essential for photosynthesis to take place

    The steps necessary for setting up the experiment, 'To demonstrate that light is necessary for photosynthesis' are not given here in proper sequence: I. Keep the potted plant in sunlight for 3 to 4 hours. II. Keep the potted plant in darkness for about 48 hours. III. Cover a leaf of the plant with a strip of black paper. IV. Pluck the leaf and test it for starch. The correct sequence of steps is:

    The steps taken for setting up an experiment to demonstrate that 'light is necessary for photosynthesis', were as follows: * A strip of black paper was clipped on the leaf of a potted plant * The plant was kept in the sun for four hours * The strip was removed and the leaf was placed in boiling alcohol in a water bath * The leaf was washed and tested for starch The result was not as expected. Identify the step which had been missed out:

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