Observation

Many candidates could not give satisfactory answers to this question. Ambiguity in answers and wrong spellings were common as many could not effectively give a sequential description as required in 4(a) and 4(c). Many candidates could not list the water quality parameters as required in  4(b).

The expected answer is as follows:

(a)        How specimen H (water pump) is used on a fish farm
                       
-           Place water pond on flat a surface
            -           The hoses are connected to the pump
-           One end of the hose is dipped into the water to be drained
-           The other end of the hose is placed / positioned for water discharge
-           The machine is switched on
-           Water is drained or pumped as desired
-           The pump / machine is switched off after usage
-           Hoses are disconnected

(b)        Water quality parameters that specimen J (Water test kit) could be used to measure

-           Conductivity
-           Dissolved Oxygen
-           pH/ alkalinity/ acidity
-           Temperature
-           Turbidity/ transparency/ total dissolved solids
-           Ammonia/ nitrate
-           Salinity
-           Hardness
           

(c)        Description of how specimen K (Secchi disc) is used in a fish pond

-           The rope is held
-           The disc is lowered slowly into the water
-           The depth at which the disc is no longer visible is noted
-           Stop lowering the disc
-           Pull the disc out
-           Take the reading
-           Repeat the process
-           Find the average of the readings taken