This was not popular question in this section and not many candidates attempted it. Those who
attempted it scored poor marks.
Many candidates could not write the correct equations for aerobic and anaerobic respiration
they rather defined the concepts and so lost the marks. Some candidates who attempted the
equation could not balance it, most of them got the reactants correctly but could not correctly
list the products ..
The expected answer was:
(a) Chemical Equations for processes
(i) Aerobic Respiration
(ii) Anaerobic respiration in plants
(Iiii) Anaerobic respiration in animals
C6H1206 -. 2CH3CH(OH)COOH + 2ATPlEnergy/150 k cal.
Most candidates who attempted this question could correctly state four functions which a
cancerous liver would not perform and drew a fair diagram of the flame cell with adequate
details however a number of candidates did not conform to the size specification, drew diagram with wooly lines, free-hand guidelines which were crossing. Spelling of labels wrongly also
contributed to the poor performance on this question.
Most candidates could also state the hormones necessary for ripening of fruits, breaking
dormancy in seeds, weed control and leaf fall but many of them could not score due to wrong
spelling of hormones. Expected answers include:
Hormones responsible for
ripening of fruit - auxin/ethane/ethylene/ AA
breaking of dormancy in seeds - AuxiniGibberelins/cytokinins (kinta)
weed control- Auxin/2,4 - D/2,4 - Dichlorophenoxyacetic acid
leaf fall - Abscisic acid.