K.C.S.E Biology Q & A - MODEL 2005PP1QN14

K.C.S.E Biology Q & A - MODEL 2005PP1QN14

A set up that was used to investigate certain process in plants is shown in the diagram below.

​a) What process was being investigated? 
b) (i) State two precautions that should be taken when setting up the experiment. 
(ii) Give a reason for each precaution stated in b(i) above.
c) State three environmental factors that influence the process Under investigation. 

answers

a) Transpiration
b)i) The leafy shoot should be from herbaceous plant
 Cut off the last few centimeters of the stalk under water
 All the air in the capillary tubule should be expelled
  Jelly should be applied around the stem around the rubber bung.
  The end of the capillary fusing should rest in beaker of water.
  ii) Avoid air bubbles.
  For continuity of the flow of water
   Jelly should not touch the xylem vessels because it might block they xylem.
   To avoid introduction of air bubbles in the xylem.
   For continuity of water uptake.
  c) Temperature
            Humidity
            Wind
    Atmospheric pressure
Light intensity
Availability of water