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P4 General Studies: Plant Growth and Photosynthesis (Paper 2 (intermediate))
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 2 (intermediate))
Paper two sets photosynthesis beside respiration and adds sums on sunshine hours, sprouting conditions and growth rates.
Direct answers For comparison questions, list two columns first; for sums, write down the original amount so the denominator stays right.
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)
- FoundationHow do photosynthesis and respiration differ in the gases they use?
- FoundationWhat three conditions does a seed need in order to germinate?
- FoundationWhich two raw materials are joined to make the sugar in photosynthesis?
- IntermediateA day has twelve hours of daylight, eight of them in direct sun. What share is in direct sun?
- IntermediateDaily sunshine rises from six hours to nine hours. What is the percentage increase?
- IntermediateEighteen of twenty-four seedlings grow well. What share is that?
- ChallengeA water plant gives out 8 mL of oxygen an hour in the light. How much in five hours?
- ChallengeOne plant grows 1 cm in 40 hours, another needs 240 hours for 1 cm. How many times slower is the second?
- ChallengeWhat does raising the carbon dioxide level in a greenhouse usually do?
- Error redoError clinic: a seed needs light before it will sprout. Is that right?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Photosynthesis takes in carbon dioxide and gives out oxygen; respiration takes in oxygen and gives out carbon dioxide. | The gas flows are opposite; photosynthesis is stronger by day, so the leaf as a whole still gives out oxygen. |
| 2 | Water, air (oxygen) and a suitable temperature; light is not needed. | Many seeds sprout in the dark under soil, so light is not one of the conditions. |
| 3 | Water and carbon dioxide. | With light and chlorophyll, water and carbon dioxide combine into sugar and oxygen is released. |
| 4 | 66.7 percentage points. | Eight divided by twelve and multiplied by 100 gives 66.7 percentage points. |
| 5 | 50.0 percentage points. | Nine minus six is three hours; three over the original six times one hundred gives 50.0 percentage points. |
| 6 | 75.0 percentage points. | Eighteen divided by twenty-four and multiplied by 100 gives 75.0 percentage points. |
| 7 | 40 mL. | Eight times five gives 40 mL; the bubbles are a rough guide to how fast photosynthesis runs. |
| 8 | 6.0 times. | Two hundred forty divided by 40 gives 6.0, so the second grows only one sixth as fast. |
| 9 | It speeds up photosynthesis, so plants grow faster and yield more. | Carbon dioxide is a raw material; more of it means more photosynthesis, as long as light and water are enough. |
| 10 | No. | Sprouting needs water, oxygen and warmth; light matters after the shoot appears, for growth and photosynthesis. |
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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