Waec Model Questions Vol1 2023 Biology Question 3

Practice essay / theory question 3 from the 2023 Waec Model Questions Vol1 Biology examination. This question covers Nutrition, Energy balance, Dietary fibre .

Waec Model Questions Vol1 2023 Biology Essay / Theory
Topics: Nutrition Energy balance Dietary fibre
Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay

A 15‑year‑old girl weighing 55 kg and 160 cm tall is a secondary school student who participates in moderate‑intensity basketball training three times a week for 90 minutes each session. She consumes a mixed diet whose average composition per 100 g of food is: carbohydrate 55 g, protein 12 g, fat 10 g, fibre 5 g, ash 2 g. The total daily food intake is 2 kg.

Question Parts

( a )
Estimate her basal metabolic rate (BMR) using the Schofield equation for females aged 10‑18: BMR (kcal/day) = 13.384 × weight (kg) + 692.6. Show your calculation.
( b )
Determine her total daily energy expenditure (TDEE) assuming a physical activity level (PAL) of 1.6 for moderate activity and adding the extra energy cost of basketball sessions, where each minute of moderate‑intensity basketball burns 8 kcal. Show all steps.
( c )
Using the food composition data, calculate the total daily energy supplied by the diet (use 4 kcal/g for carbohydrate and protein, 9 kcal/g for fat). Compare this value with her TDEE and comment on whether her diet is adequate, insufficient or excessive. Provide a brief explanation linking to possible health consequences.
( d )
The diet provides 55 g of fibre per day. Discuss the role of dietary fibre in the digestive system and its importance for a teenage athlete.

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About This Question

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

The question covers Nutrition, Energy balance, Dietary fibre .

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