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by Procheta Mallik

Introduction

Place a leaf in hot water and observe the emergence of bubbles through its stomata. See if this happens with cold water

Tools

Parts

    • Be careful while heating and using hot water

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  1. Put a fresh leaf in a transparent glass of hot water; the water should be about 60 degrees Celsius.
    • Put a fresh leaf in a transparent glass of hot water; the water should be about 60 degrees Celsius.

    • You should observe some bubbles emerging from the leaf and coming up to the surface of the water.

    • This emergence of air bubbles demonstrates the presence of pores in the leaf. These pores are called Stomata.

    • Thanks to the hot water, the air inside the leaf will expand when heated, so the extra volume of air is pushed out of the stomata.

    • Note : The bubbles are observed only on the lower side of the leaf but not on the upper side (fig-3), since the number of stomata are more on the underside of the leaf.

    vishal: do we need to specify the temperature at which this works?

    Procheta Mallik - Reply

    • Take a glass full of cold water.

    • Take a leaf and immerse it into the cold water in the glass.

    • There should not be any emergence of bubbles

    • The cold/room-temperature water doesn't expand the air in the leaf, so none of it is ejected through the pores

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Finish Line

Kailash NR

Member since: 05/02/2017

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