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Test for Oxygen Requirement on Germinating Seeds

Which of the ...

Question

Which of the following precautions are to be taken for a successful run of the experiment to show that carbon dioxide is given out during respiration?
A. Cork should be air-tight
B. Seeds in the flash should be totally dry
C. A small tube with freshly prepared KOH solution should be placed in the flask
D. The end of the delivery tube should be above water level
The correct answer is :
(1) A and B
(2) A and C
(3) A, B and C
(4) A, B and D

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Solution

The precautions to be taken in the above experiment are -
A. Cork should be air-tight so that the carbon dioxide produced during the process does not escape out.
C. A small tube with freshly prepared KOH solution should be placed in the flask so that it can absorb the carbon dioxide produced and create a vacuum in the flask. This vacuum is necessary for the water level to rise in the bent tube.

Hence, the correct answer is option 2.

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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.

Q. The apparatus required to perform the experiment to show the evolution of carbon dioxide during respiration includes:

(1) flat-bottom flask,rubber cork , small glass tube, water,KOH solution,delivery tube ,germinating seeds,thread,vaseline, small beaker

(2) round-bottom flask,rubber cork, boiling tube,water,NaOH solution, delivery tube ,dry seeds, thread, vaseline, small beaker

(3) measuring-flask, rubber cork,small glass tube,water,Na₂CO₃solution,delivery tube,germinating seeds, thread,vaseline,small beaker

(4) flat-bottom flask, rubber cork, small glass tube,water,KOH solution, delivery tube, dry seeds,thread, vaseline,small beaker

Q. 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.

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. Why is some KOH placed in a small test tube in the flask with germinating seeds in the experiment to demonstrate occurrence of respiration in germinating seeds?
(1) To provide oxygen required by the seeds for respiration.
(2) To absorb carbon dioxide and create partial vacuum in the flask.
(3) To absorb water from the seeds to make them dry.
(4) To make the air present in the flask alkaline.

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Test for Oxygen Requirement on Germinating Seeds

Standard IX Biology

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