Lime water turns cloudy in the presence of a gas, which is a by-product of respiration. Shown below are four setups kept in sunlight for 24 hours. In which setup is lime water expected to be the cloudiest?

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Lime water turns cloudy in the presence of a gas, which is a by-product of respiration. Shown below are four setups kept in sunlight for 24 hours. In which setup is lime water expected to be the cloudiest?

lime water turns cloudy in the presence of a gas

A. P
B. Q
C. R
D. S

For visually impaired students:

Which of the following statement is incorrect concerning the experiment to show that sunlight is necessary for photosynthesis?

A. The leaf should be destarched before conducting the experiment.
B. The leaf kept in darkness will show the presence of starch.
C. The leaf exposed to sunlight will show the presence of starch.
D. Starch is the end product of photosynthesis.

Class 10

Answers (1)

digitalvishal355

C. R
Explanation: 
Limewater turns cloudy in the presence of carbon dioxide \((CO_2)\).
In Set R, the plant is kept in a black-painted tank, so no light enters it. Therefore, photosynthesis does not take place, but the plant continues to respire and release \((CO_2)\).
The \((CO_2)\) reacts with the limewater and makes it cloudy.
Hence, the limewater in Set R will be the cloudiest.

For visually impaired students:

B. The leaf kept in darkness will show the presence of starch