Question

A student sets up the apparatus for the experiment to show that $C{O}_2$ is released during
respiration. After two hours he would observe :

• A. KOH turning milky
• B. water level rising in the bent tube in the beaker.
• C. water level decreasing in the bent tube
• D. no change in water level in the bent tube.

Answer 1

The correct option is B water level rising in the bent tube in the beaker.

B. water level rising in the bent tube in the beaker.

Solution : The beaker that has the co2 and the germinating plants is fixed with a bent tube that dips in water. The plants use up the co2 in the beaker that decreases the pressure and thus pushing the water up the bent tube .

So the correct answer is " water level rising in the bent tube in the beaker.".