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Food Storage and Preservation

rathin used b...

Question

rathin used boiled seeds to demonstatethat CO2is given off during respiration. His observation in the water level in the delivery tube will be?

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Solution

It shows the presence of CO₂ produced due to rise in the level of water, CO₂during respiration by germinating seeds.

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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. 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. An experimental set-up is given here to demonstrate that CO₂ is given out during respiration. Four students made the following observations marked as I, II, III and IV.

I. Level of water remained the same in both the beaker and the delivery tube
II. Level of water increased in the delivery tube
III. Level of water reduced in both the beaker and the delivery tube
IV. Water ascends into the delivery tube and back flows into the beaker.
Which one of the above is the correct observation?
(1) I
(2) II
(3) III
(4) IV

Q. The experimental set up shown here to demonstrate that ‘CO₂ is given out during respiration’, did not yield expected results because :

(1) the flask was not air tight
(2) there was no KOH in test tube in the flask
(3) the delivery tube was dipped in water
(4) the germinating seeds were not immersed in water

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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