This was the most popular question in this section and candidates who attempted it did quite well. Most candidates correctly named the two stages of photosynthesis but a good number
Of candidates however could not write chemical equations to represent each stage. Some candidates who could correctly state the reactants and products could not list the correct conditions for the reactions.
Expected answers are:
4 H2O Light/Energy 4H⁺ + 4(OH)
4H + CO2 Enzyme CH2O + H2O
Most candidates performed well in stating the vitamins, their functions and deficiency symptoms and scored high marks. A good number of candidates however did not separate Vit B into B1,2,3,or 12, they just stated vitamin B and so they lost some marks. Most candidates who attempted the question could define roughage but nearly all of them could not state the functions of roughage.
Expected answers include:
Functions of Roughage
For easy digestion of food; stimulates bowel movement/prevention of constipation; prevention of colon cancer.