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P4 General Studies: Plant Growth and Photosynthesis (Paper 1 (basics))
Tutor Prep Guide · the three raw materials for photosynthesis, chlorophyll and the oxygen given out, roots taking up water and the stem carrying it, and how photosynthesis differs from respiration
P4 General Studies: Plant Growth and Photosynthesis (Paper 1 (basics))
Paper one starts from the basics: the three raw materials, where photosynthesis happens, and how water is taken up.
Direct answers Ask first about the raw materials, then the place, and only then work out the share.
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: Plant Growth and Photosynthesis |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationWhat three things does a plant need for photosynthesis?
- FoundationIn which part of a plant does photosynthesis mainly happen?
- FoundationWhich gas is given out during photosynthesis?
- IntermediateSixty-two out of one hundred leaves turn blue-black with iodine. What share is that?
- IntermediateFifteen of twenty pots of mung beans sprout. What share sprouted?
- IntermediateTwo hundred millilitres of water is poured into a pot and 150 mL drains out. How much did the soil take up, and what share is that?
- ChallengeFour of six seedlings on a window sill lean towards the light. What share is that?
- ChallengeA leaf wrapped in black paper for three days stops growing. Why?
- ChallengeWhat is the main job of a plant root?
- Error redoError clinic: a plant only breathes during the day. Is that right?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Water, carbon dioxide and sunlight. | Photosynthesis uses light and chlorophyll to turn water and carbon dioxide into food; missing any one stops it. |
| 2 | In the leaves, which contain chlorophyll that absorbs light energy. | Chlorophyll traps light energy; roots have none, so they cannot make food. |
| 3 | Oxygen. | The oxygen released is used for breathing by the plant itself and by other living things. |
| 4 | 62.0 percentage points. | Sixty-two divided by one hundred times one hundred gives 62.0 percentage points. |
| 5 | 75.0 percentage points. | Fifteen over twenty times one hundred gives 75.0 percentage points. |
| 6 | 50 mL, which is 25.0 percentage points. | Two hundred minus 150 gives 50 mL; divided by 200 and multiplied by 100 that is 25.0 percentage points. |
| 7 | 66.7 percentage points. | Four divided by six and multiplied by 100 gives 66.7 percentage points. |
| 8 | Without light the leaf cannot photosynthesise, so it makes no food. | With the light blocked, water and carbon dioxide are not enough; no food is made and growth stops. |
| 9 | To absorb water and minerals and to hold the plant in the soil. | Roots take up water and minerals, which the stem carries up to the leaves for photosynthesis. |
| 10 | No. | Respiration runs day and night; photosynthesis is simply stronger by day and hides it. |
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.
After paper one, take paper two and sort out series against parallel in one pass.Tutor Registration →
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