Food Test & Classification Biology Practical O, Level (Form 3 & 4)
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Read the practical details carefully and then answer the following questions
You are provided with solution T, U, V, W and X
a). Pour about 2cm3 of solution T in a test tube; add three drops of iodine solution. Shake well and record your observation
i) Observation
ii) What does this suggest?
b) Pour about 2cm3 of solution U in a test tube; add equal volume of Benedict’s solutions. Heat gently to boiling point and record your observation
i) Observation
ii) What does this suggest?
c) Pour about 2cm3 of solution V in a test tube; add few drops of Sudan (III) solution. Shake well and leave the mixture to stand for about 3 minutes. Record your observation
i) Observation
ii) What does this suggest?
d) Pour about 2cm3 of solution W in a test tube; add few drops sodium hydroxide (NaOH) followed by drop wise addition of copper II sulfate solution. The mixture was well shaken after each drop of copper II Sulfate. Record your observation
i) Observation
ii) What does this suggest?
e) Pour about 2cm3 of solution X in a test tube, add few drops of dilute HCl acid, heat the mixture and let it cool. Add few drops of Sodium Hydroxide followed by addition of equal amount of Benedict’s solution. Heat gently to boiling point and record your observation
i) Observation
ii) What does this suggest?
f) Among the foods tested which one is digested first (before others). State where in the elementary canal is
That food digested
The enzyme involved
The end products
g) Mention at least one natural sources of each identified food substances
BIOLOGY PRACTICAL O, LEVEL (Form 3 & 4): FOOD TEST & CLASSIFICATION
