K.C.S.E Biology Q & A - MODEL 2012PP1QN07

K.C.S.E Biology Q & A - MODEL 2012PP1QN07

The diagram below represents a set-up that students used in an investigation.

​(a) Name the physiological process that was being investigated. 
(b) State the role of potassium hydroxide in flask K. 
(c) Account for the observation in boiling tube L and flask N. 
L .
N 

answers

​(a) Respiration/aerobic respiration;
(b) Flask K Potassium hydroxide removes Carbon IV Oxide from atmospheric air;
(c) L - Lime water remains clear because Carbon (IV) Oxide has been removed;
Flask N lime water forms a white precipitate because the respiring cockroaches produce Carbon (IV) Ovide;