Ijmb Model Questions Vol1 2023 Biology Question 3

Practice practical question 3 from the 2023 Ijmb Model Questions Vol1 Biology examination. This question covers Nutrition .

Ijmb Model Questions Vol1 2023 Biology Practical

Topic: Nutrition

Question 3 IJMB_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • practical

A sample of an unknown food item weighing 5.00 g was subjected to a series of standard gravimetric analyses to determine its major nutritional components. The following observations were recorded: - Moisture loss after drying at 105 °C: 0.60 g - Ash obtained after incineration at 550 °C: 0.45 g - Crude fat extracted by Soxhlet extraction with petroleum ether: 0.75 g The remaining mass after accounting for moisture, ash and fat is assumed to be crude protein.

Question Parts

( a )

Calculate the percentage (w/w) of moisture, ash, crude fat and crude protein in the sample.

( b )

A 70 kg adult requires protein at 0.8 g kg⁻¹ day⁻¹. Based on the protein content you have calculated, determine how many grams of the food sample must be consumed to meet the daily protein requirement.

( c )

Identify two possible sources of error that could affect the accuracy of the crude fat determination by Soxhlet extraction.

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About This Question

This is Ijmb Model Questions Vol1 2023 Biology Question 3. It is one of the practical questions from the 2023 Ijmb Model Questions Vol1 Biology examination.

The question covers Nutrition .

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