Edexcel IGCSE Biology Substitute Values with Units

Practise Edexcel IGCSE Biology substituting values with units by converting units and applying formulae to biological measurements.

Exam points

Convert centimetres to metres before substituting height or distance into a formula.
Calculate BMI, nerve impulse time or urine volume by substituting values with units.

[Maximum number: 3]

The body mass index (BMI) is a measure that uses your mass and height to calculate if your mass is appropriate for your height.

BMI is calculated using the formula

\mathrm{BMI}=\text { mass in } \mathrm{kg} \div(\text { height in } \mathrm{m})^{2}

(a)

Person X has a mass of 60 kg and a height of 165 cm .

Calculate the BMI of person X.

[ 2 ]

$\begin{aligned} 60 \div(1.65 \times 1.65) 60 \div 2.7225 =22.0(2) \end{aligned}$

award full marks for correct numerical answer without working

one mark for 1.65

Allow 20

(b)

BMI values can be divided into categories.

The table shows these categories.

Table for Question (b) — Edexcel IGCSE Biology

Give the category of person X.

[ 1 ]

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3C Substitute values with units question 1

Question (a)

Question (b)