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Biology · Grades 7–10

Digestion, absorption and nutrients

Separate breaking down food from moving nutrients into the body.

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Learn the idea

Digestion

Digestion includes mechanical processing and chemical breakdown of food molecules.

Enzymes

Digestive enzymes act on particular classes of molecules.

Absorption

Absorption transfers suitable products across an exchange surface into blood or lymph.

Balance

This guide explains biology, not a personalized diet or treatment plan.

Worked examples

Which process describes chemical breakdown of a large food molecule?

Chemical digestion changes molecules into smaller products.

Digestion.

Which process transfers products across the intestinal surface?

Absorption moves substances across an exchange barrier.

Absorption.

Check your understanding

  1. What is a typical role of amylase?

    1. Making every protein from DNA.
    2. Only digesting mineral ions.
    3. Breaking down starch.

  2. A model has 5 equal folds adding 8 area units each. How much area do those folds add?

  3. Why do folds and villi support absorption?

Answers and marking notes

Answers and marking notes
  1. Breaking down starch.

    Amylase acts on starch-related carbohydrates.

  2. 40

    5 × 8 = 40 area units.

  3. They increase the available surface area.

    Explain the structure-function relation rather than saying more area is always better without context.

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.