Neco Model Questions Vol1 2021 Biology Question 3

Practice practical question 3 from the 2021 Neco Model Questions Vol1 Biology examination. This question covers Nutrition, Carbohydrate analysis .

Neco Model Questions Vol1 2021 Biology Practical
Topics: Nutrition Carbohydrate analysis
Question 3 NECO_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • practical

A student is required to determine the carbohydrate content of a commercial cereal sample using the Benedict’s test.

Question Parts

( a )
Outline the procedure for preparing a standard glucose curve using Benedict’s reagent, specifying the concentrations of the five standard solutions.
( b )
Using the data below, determine the concentration of carbohydrate in the cereal extract. (No graph is required – use linear interpolation.) Standard glucose solutions: | Concentration (g L⁻¹) | Precipitate volume (mL) | |-----------------------|--------------------------| | 0 | 0.0 | | 2 | 1.2 | | 4 | 2.4 | | 6 | 3.6 | | 8 | 4.8 | Cereal extract (5.0 mL of extract was mixed with 2 mL Benedict’s reagent) gave a precipitate volume of 3.0 mL.
( c )
Calculate the percentage (w/w) of carbohydrate in the cereal sample, given that 2.00 g of the powdered sample was extracted in 50.0 mL of water and 5.0 mL of the extract was used for the test.
( d )
List two possible sources of error in this experiment and suggest how each could be minimised.

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About This Question

This is Neco Model Questions Vol1 2021 Biology Question 3. It is one of the practical questions from the 2021 Neco Model Questions Vol1 Biology examination.

The question covers Nutrition, Carbohydrate analysis .

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