K.C.S.E Biology Q & A - MODEL 2010PP1QN15
A potted plant was kept in the dark for 48 hours, Two leaves X and Y were treated as shown in the diagram below.
The experimental set-up was kept in sunlight for 6 hours after which a starch test was carried out on the two leaves. .
(a) What were the results of the starch test on leaves X and Y’?
(b) Give reasons for your answers in (a) above.
a) X — Starch present;
b) X - Acts as a control;
Y - CO2 absent absorbed by potassium hydroxide pellets;