Nutrition and digestion explain how food becomes the small molecules that cells use. This section has four lessons and a practice set, and it is part of the wider SPM Biology guide.
What does this section cover?
Start with tracing digestion through the alimentary canal, which gives you the route. Then learn relating enzymes to substrates and products, the pairs you need to write in answers.
Next, explaining absorption and assimilation covers what happens after digestion. The fourth lesson is interpreting nutrition information as curriculum data, and the practice set mixes questions from all four.
One meal, four lessons
Take an original meal: rice with a boiled egg. Rice is mostly starch and the egg is mostly protein.
| Stage | What happens | Lesson |
|---|---|---|
| Mouth | Starch begins to break down | Tracing digestion |
| Enzyme pairs | Amylase acts on starch, protease on protein | Enzymes |
| Small intestine wall | Glucose and amino acids enter the blood | Absorption and assimilation |
| Reading a label | Protein per serving from a table | Nutrition data |
One meal gives one story, and each lesson adds one skill to it.
Who should start where?
If the order of the organs is unclear, start with tracing digestion. If you know the order but swap enzymes and products, go to the enzyme lesson.
If you can describe each stage but lose marks on what happens to the food afterwards, read absorption and assimilation. The enzyme ideas connect to metabolism and enzymes.
How do the parts connect?
The canal is the route, enzymes are the tools on that route, absorption is the exit and assimilation is the use. Nutrition data asks you to read values from a table, which is a separate skill.
Note your slips in the mistake log tool to see which part needs another look.
Can one-to-one lessons help here?
They help when you know the facts but cannot join them into a written explanation. A teacher can follow one meal through the body with you and ask what happens next at each step. See online one-to-one Biology tuition, or start with the one-hour trial class (from RM50).