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Experiments on Plant Respiration

A student whi...

Question

A student while experimenting on carbon dioxide is given out during respiration, he forgot to take two precautions as given below :

a) To hang a test tube containing KOH solution in the conical flask.
b) To put moist seeds in the conical flask.
State the result of the experiment due to the mistakes caused by him.

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Solution

a) The function of KOH in the respiration reaction is to absorb the carbondioxide released. In absence of this CO2 cannot be absorbed and the experiment is total failure.
b) Moist seeds absorbs water vapour and reduces the amount of water in the experimental flask. Due to release water by leaves during transpiration cause experimental disorder.

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Similar questions

Q. Why we should take germinating seeds in a conical flask for the experiment carbon dioxide is given out during the process of respiration?

Q. In the experiment to show that

C O_{2}

is released during respiration', the small test tube of KOH solution is suspended inside the conical flask to absorb the :
(a) air of the flask
(b) moisture of the flask
(c)

O_{2}

of the flask
(d)

C O_{2}

of the flask released by the seeds

Q. The seeds respirate at the time of germination. While showing this experiment a test tube with

K O H

is kept in the conical flask to ______

Q. For experiment showing that

C O_{2}

is evolved during the process of respiration in plants - arrange the steps sequentially.

i) Soak gram seeds in water, overnight. Keep them in conical flask.
ii) Close the conical flask with cork fitted with 'U' tube.
iii) Insert test tube with KOH solution in the conical flask.
iv) Keep the set steady for some time.

Q. Which one of the following is the correct set of three precautions for setting up the experiment to demonstrate that carbon dioxide is evolved during respiration?
(1) Air tight set up; delivery tube dips in water in beaker; flask has seeds which have just germinated.
(2) Thread holding KOH test tube; air tight flask; delivery tube above surface of water in the beaker.
(3) Germinated seeds under water in the flask; experimental set up not air tight; delivery tube above water level.
(4) Delivery tube touching bottom of water; KOH test tube held by a thick wire; seeds covered by water.

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