Connect vitamin D with calcium use and rickets
Name dietary vitamin D sources and explain its bone role.
Section B7.1 · Diet
Exam scope and assessment notes
Mapped to the named 0973 section using teaching from the corresponding single-science course. A 0973-specific review of every Core and Supplement objective is still in progress. Written practice is self-checked; it does not demonstrate supervised laboratory competence or award an official Cambridge grade. This qualification reports two grades on the 9–1 scale; confirm the entry route for your zone and exam series.
Before you begin
- Recall large and small nutrient molecules, cell membranes and enzyme specificity.
- Use the stated diagram keys and evidence; models are not to scale.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which dietary source can provide vitamin D?
What you will learn
- Name dietary vitamin D sources and explain its bone role.
- Separate dietary sources from skin synthesis.
Compare vitamin C and vitamin D
| Component | Examples of sources | Role |
|---|---|---|
| Vitamin C | Citrus fruit, peppers | Connective tissue; deficiency: scurvy |
| Vitamin D | Oily fish; labelled fortified foods | Calcium use; deficiency: rickets |
Distinguish source and function
Oily fish and egg yolk are dietary vitamin D sources; suitably fortified foods can also provide it when their labels state this. Skin can synthesise vitamin D with suitable sunlight exposure, but sunlight is not a dietary food source.
Vitamin D helps calcium absorption and supports normal bone mineralisation. Vitamins and mineral ions are different categories: vitamin D does not turn into calcium.
Explain the named deficiency disease
Vitamin D deficiency can cause rickets in children, with poorly mineralised developing bones. A balanced supply of calcium also matters, so bone development cannot be reduced to one nutrient acting in isolation.
The syllabus association is a biological explanation, not a diagnosis from a picture or a personal sunlight/dosage recommendation. Use the stated deficient intake or evidence rather than claiming every bent bone has the same cause.
Sources for this lesson
Pause and explain
Which statement connects vitamin D to bones?
Worked example
A school case states inadequate vitamin D and impaired calcium absorption. Connect this to the named childhood disease.
Show the worked solution
- Identify the vitamin role in calcium absorption.
- Connect poor mineralisation to developing bones.
- Name rickets.
Answer Vitamin D deficiency can impair calcium use and contribute to rickets in children.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Name a dietary vitamin D source and the associated deficiency disease.
Give me a hint
Use oily fish and the childhood disease.
Compare my reasoning
- Name oily fish.
- Name rickets from vitamin D deficiency.
Oily fish; inadequate vitamin D can cause rickets in children.
Look for these in your work
- Dietary source.
- Correct deficiency cause.
A fortified drink supplies calcium but is stated to contain no vitamin D. Does calcium presence prove that vitamin D needs are met?
Give me a hint
Separate mineral and vitamin.
Compare my reasoning
- Calcium and vitamin D are distinct.
- Check a vitamin D source separately.
No; calcium content alone does not establish an adequate vitamin D supply.
Look for these in your work
- Separate the nutrients.
- Use stated label evidence.
A student lists “sunlight” as a food source of vitamin D. Improve the wording.
Give me a hint
Separate skin synthesis and diet.
Compare my reasoning
- Sunlight can support vitamin D synthesis in skin.
- Oily fish or labelled fortified foods are dietary sources.
Sunlight supports skin synthesis; dietary sources include oily fish and appropriately fortified foods.
Look for these in your work
- Correct both routes.
- Do not describe sunlight as food.
Common mistakes
- Sunlight is not a dietary food.
- Vitamin D and calcium are not interchangeable molecules.
What can you explain now?
Which statement connects vitamin D to bones?
Compare with the explanation
It helps calcium absorption and normal mineralisation.
This links the vitamin to mineral use.
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
Explain how a vitamin can support a mineral’s use without becoming that mineral.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.