K.C.S.E Biology Q & A - MODEL 2015PP1QN09
The diagram below shows an experimental set up to investigate a certain physiological process in plants.
(a) State the aim of the experiment.
(b) State the role of the following in the experiment:
(i) potassium hydroxide;
(ii) aluminum foil.
(c) Account for the expected colour change in tube F.
(a) To show that carbon (TV) oxide is produced during respiration in plants;
(b) (i) Absorb carbon (IV) oxide from the (incoming) air;
(ii) Exclude light / to prevent photosynthesis;
(c) No colour change in tube F / no observable colour change.
Carbon (IV) oxide removed/absorbed from air by potassium hydroxide.