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 tubeII. Level of water increased in the delivery tubeIII. Level of water reduced in both the beaker and the delivery tubeIV. 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

An experimental set-up is given here to demonstrate that CO2 is given

1.	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 tubeII. Level of water increased in the delivery tubeIII. Level of water reduced in both the beaker and the delivery tubeIV. 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
Answer» 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