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P4 General Studies: Digestion and Nutrition (Paper 2 (intermediate))
Tutor Prep Guide · the digestive system and the food pyramid, enzymes and bile, energy and nutrient calculations, and balanced eating habits
P4 General Studies: Digestion and Nutrition (Paper 2 (intermediate))
Paper two adds enzymes and bile, and uses fat and protein calorie conversions to check that energy sums are really understood.
Direct answers Three steps for energy sums: find the kcal from that nutrient, divide by kcal per gram, then write the unit in g.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: P4 General Studies: Digestion and Nutrition |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationWhich enzyme does saliva contain?
- FoundationWhat does the hydrochloric acid in gastric juice do?
- FoundationWhich organ makes bile?
- IntermediateWhat does bile do to fat?
- IntermediateWhy is the inner wall of the small intestine covered with villi?
- IntermediateWhat does dietary fibre do?
- ChallengeA pupil eats 2000 kcal a day with 30 per cent from fat at 9 kcal per gram. How many grams of fat is that?
- ChallengeA portion contains 12 g of protein at 4 kcal per gram. How many kcal does it supply?
- ChallengeA 500 g meal contains 25 g of fat. What percentage is fat?
- Error redoError clinic: does digestion happen only in the stomach?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Amylase. | Amylase breaks starch into smaller sugars, which is why rice tastes sweeter the longer you chew. |
| 2 | It kills most germs that come in with food and gives the acid conditions enzymes need. | Gastric juice is strongly acidic, so it both kills germs and keeps protein enzymes active. |
| 3 | The liver makes it and the gall bladder stores it. | The liver produces bile, and the gall bladder squeezes it into the small intestine after a meal. |
| 4 | It emulsifies large fat drops into small ones. | Smaller drops give a much larger surface for lipase to work on. |
| 5 | They increase the surface area so nutrients are absorbed faster. | Villi multiply the absorbing area, so nutrients enter the blood quickly. |
| 6 | It stimulates gut movement, helps passing stools and prevents constipation. | Fibre cannot be digested, but it bulks up the waste so it passes more easily. |
| 7 | 66.7 g | 2000 times 0.30 gives 600 kcal, and dividing by 9 gives 66.7 g. |
| 8 | 48 kcal | Twelve times four gives 48 kcal. |
| 9 | 5.0 per cent | Twenty-five divided by 500 times 100 gives 5.0 per cent. |
| 10 | No. | Digestion starts in the mouth and is mostly completed in the small intestine; the stomach is only one stage. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Then try paper three, using voltage and current to work out power and resistance.Tutor Registration →
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