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Primary General Studies: Classifying Living Things and Biodiversity (Paper 2 (intermediate))
Primary General Studies: Classifying Living Things and Biodiversity (Paper 2 (intermediate))
Paper two covers flowering and non-flowering plants, the number of steps in a yes-or-no key, and calculating means and percentages from quadrat data.
Direct answers Each key question halves the range, so use powers of 2 to count steps; for a mean, divide the total by the number of quadrats.
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: Primary General Studies: Classifying Living Things and Biodiversity |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationWhich part do flowering plants use to reproduce?
- FoundationWhich three groups are non-flowering plants?
- FoundationOf 4 plant groups, 3 do not flower. How many groups do flower?
- IntermediateUsing a yes-or-no key to identify 8 organisms, what is the fewest number of questions?
- IntermediateA key needs 4 steps for a batch of organisms. What is the largest possible number of species?
- IntermediateA forest plot records 200 plant species, 150 of which flower. What percentage flower?
- ChallengeA reserve holds 500 insect species and 20 per cent are unrecorded. How many species are unrecorded?
- ChallengeThree quadrats hold 12, 9 and 15 snails. What is the mean per quadrat?
- ChallengeSite A records 40 insect species and site B records 25, with no overlap. What is the combined total?
- Error redoA classmate says mosses do flower but the flowers are too small to see. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | The flower: after pollination and fertilisation they form fruit and seeds. | Flowers, fruit and seeds are the reproductive parts of flowering plants. |
| 2 | Mosses, ferns and gymnosperms. | Mosses and ferns use spores while gymnosperms use seeds that are not enclosed in fruit. |
| 3 | 1 group. | 4 minus 3 leaves 1, the only group that flowers. |
| 4 | 3 questions. | Each question halves the choices, and 2 to the power 3 is 8, so 3 steps are enough. |
| 5 | 16 species. | 2 to the power 4 is 16, so four yes-or-no steps can separate at most 16 species. |
| 6 | 75 per cent. | 150 ÷ 200 × 100 = 75, which is three quarters. |
| 7 | 100 species. | 500 × 0.2 = 100, so 400 species have been recorded. |
| 8 | A mean of 12. | The total of 36 divided by 3 gives 12, which lets you compare sites. |
| 9 | 65 species. | With no overlap you simply add: 40 + 25 = 65. |
| 10 | Mosses do not flower and have no seeds; they reproduce by spores and are non-flowering plants. | Being invisible is not a feature; the method of reproduction is what counts. |
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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