O Level Biology Practical 2020 Answers -

: To ensure a fair test, keep the surface area/size of beetroot cylinders constant. Food Tests (Glucose Concentration): Benedict's solution and heat in a water bath. : A change from blue to green, yellow, orange, or indicates the presence of reducing sugar. Reliability

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The enzyme is a protein. Above the optimum temperature (40°C), hydrogen and disulfide bonds break, changing the shape of the active site. The substrate can no longer bind (denaturation). The reaction is irreversible. : To ensure a fair test, keep the

A detailed 2020 O-Level Biology Practical Guide is available on Scribd , which includes suggested answers for the urine sample and fruit drawing questions. Reliability 2020 O-Level Biology Practical Guide | PDF

"TS of a Dicot Leaf (Magnification: as seen under x40)"

: Record the color change observed in the Benedict's test after heating for 5 minutes.