Question 5
Why is no change in water level seen in setup B of activity 03?
The right answer is the one marked above.
Because the volume of CO2 released and the volume of O2 absorbed balance. With no KOH the CO2 stays inside the flask, so the total volume does not change.
The seeds in setup B are respiring and are not dead — the difference lies not in the seeds but in the absence of KOH. Nothing in the experiment mentions a blocked tube.