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Cellular Respiration

IN AN EXPERIM...

Question

IN AN EXPERIMENT TO SHOW CARBON DIOXIDE IS RELEASED DURING RESPIRATION,THE WATER LEVEL RISES IN THE DELIVERY TUBE WHY??

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Solution

The water rises in delivery tube due to the development of partial vacuum inside it .This happens because the carbon-dioxide released by the germinating seeds will be soaked by potassium hydroxide present in the flask containing those seeds. This soaking of CO₂will develop partial vacuum which sucks the water up and hence the water level rises.

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Q. In the experiment to demonstrate that CO₂ is given out during respiration, what would you observe in the delivery tube dipped in water?
(1) Water level rises in the delivery tube
(2) Water turns milky and rises in the delivery tube
(3) Water turns milky but does not rise in the delivery tube
(4) Water level in the delivery tube remains unchanged

Q. A student conducted an experiment to show that carbon dioxide is released during respiration. State two precautions that the student must take for obtaining correct observations.

Q. The chemical required in the experiment to show that carbon dioxide gas is released during respiration is:
(1) potassium bicarbonate
(2) potassium dichromate
(3) potassium permanganate
(4) potassium hydroxide

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

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