中文（繁體）
中文（简体）
English
Primary General Studies: Classifying Living Things and Biodiversity (Paper 3 (challenge))
Primary General Studies: Classifying Living Things and Biodiversity (Paper 3 (challenge))
Paper three moves to classification levels, binomial naming and biodiversity data, using density, quadrat means and percentage change to judge ecosystem health.
Direct answers Decide first whether the data needs density times area or change divided by the original value, and never mix the two formulas.
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)
- FoundationHow are the levels of classification ordered from largest to smallest, and how many are there?
- FoundationWhat two parts make up a scientific name?
- FoundationHow many parts does a scientific name have under binomial nomenclature?
- IntermediateFive quadrats in a school ground hold 60 insects in total. What is the mean per quadrat?
- IntermediateA hectare of woodland holds 250 trees. How many in 4 hectares?
- IntermediateForest area falls from 800 hectares to 680. What is the percentage decrease?
- ChallengeAfter an alien fish is introduced, native fish fall from 120 species to 96. What is the percentage drop?
- ChallengeThree reserves record 40, 55 and 70 butterfly species. What is the mean per reserve?
- ChallengeOf 300 insect species on an island, 45 per cent are beetles. How many beetle species?
- Error redoA classmate puts kingdom below phylum and says one species can have two scientific names. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Kingdom, phylum, class, order, family, genus, species: 7 levels. | From kingdom down to species the groups get smaller but the members share more features. |
| 2 | The genus name and the species epithet, usually in Latin and in italics. | This is binomial nomenclature, which gives every species one name used worldwide. |
| 3 | Two parts. | The genus comes first and the species epithet second; both are needed. |
| 4 | A mean of 12. | 60 ÷ 5 = 12, and the quadrat mean can be used to estimate the whole field. |
| 5 | About 1 000 trees. | Density times area: 250 × 4 = 1 000, which is how quadrat density is scaled up. |
| 6 | A 15 per cent decrease. | That is 120 hectares lost; 120 ÷ 800 × 100 = 15. |
| 7 | A 20 per cent drop. | 24 species are lost, and 24 ÷ 120 × 100 = 20; alien species compete and lower diversity. |
| 8 | A mean of 55 species. | 165 divided by 3 gives 55, a baseline for judging protection. |
| 9 | 135 species. | 300 × 0.45 = 135, leaving 165 species in other groups. |
| 10 | Both are wrong: kingdom is above phylum, and a species has one worldwide scientific name written in a fixed way. | The order of levels and binomial naming are fixed rules and cannot be changed. |
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.
Paper four clears the conductor, insulator and battery direction misconceptions.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.