Edexcel IGCSE Biology Decimal-form Numbers
Practise Edexcel IGCSE Biology decimal-form numbers by calculating impulse speed differences and total nutrient requirements from percentage changes.
- Syllabus
- Issue 3 (2024)
- Course
- Biology 4BI1
Exam points
- Calculate a decimal speed difference from distance and time data for nerve impulses.
- Use a percentage increase to calculate a total daily mass, such as iron requirement.
1A Decimal-form numbers question 1
The diagram shows a fetus in the uterus of a woman.
The umbilical cord transports blood from the placenta to the fetus.
This blood contains molecules from the mother that are needed by the developing fetus.
Doctors recommend that pregnant women obtain more of some dietary components than women who are not pregnant.
The table shows the recommended percentage increase of some dietary components in the diet of a woman who is pregnant compared to a woman who is not pregnant.
The actual mass of additional iron needed by the pregnant woman was 9.0 mg per day.
Calculate the actual total mass of iron needed by the pregnant woman.
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