中文（繁體）
中文（简体）
English
Primary General Studies: Classifying Plants and Animals and Biodiversity (Paper 3 (challenge))
Primary General Studies: Classifying Plants and Animals and Biodiversity (Paper 3 (challenge))
Paper three focuses on multi-step calculation and linked concepts: the insect share, the average yearly wildlife decline, the number of ranks, the share of animals without a backbone in a wood, plus gene-based classification and habitat fragmentation.
Direct answers Ask first whether the question wants a concept or a calculation, then ask whether the denominator is the whole or a part.
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 Plants and Animals 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 habitat usually holds the highest biodiversity?
- FoundationIn the ranking of classification, what comes first and last?
- FoundationHow are scientific names formed?
- IntermediateAbout 1800000 animal species are known and about 900000 are insects. What percentage is insects?
- IntermediateWildlife numbers fell 68 percentage points in 50 years. What is the yearly average?
- IntermediateHow many ranks are there in classification?
- ChallengeA wood has 24 plant species and 8 animal species, 3 of the animals with a backbone. What percentage of animals have no backbone?
- ChallengeWhy does modern classification use genes rather than appearance alone?
- ChallengeWhat happens when a habitat is cut into pieces by roads?
- Error redoA classmate says similar looks mean the same species. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Tropical rainforest. | Heat, heavy rain and many layers let it hold the most species. |
| 2 | Kingdom is the largest and species the smallest. | Kingdom, phylum, class, order, family, genus, species: seven ranks. |
| 3 | By binomial naming: genus name plus species name. | Linnaeus proposed binomial naming and it is used worldwide so local names do not clash. |
| 4 | 50 per cent. | 900000 divided by 1800000 times one hundred gives 50 per cent. |
| 5 | About 1.4 percentage points a year. | 68 divided by 50 is about 1.4. |
| 6 | 7 ranks. | Kingdom, phylum, class, order, family, genus, species: 7 ranks in all. |
| 7 | 62 per cent. | 8 minus 3 leaves 5 without a backbone, and 5 divided by 8 times one hundred is 62 per cent. |
| 8 | Similar looks do not mean the same species; genes show true relationship. | Convergent evolution makes different species look alike, so appearance alone misleads. |
| 9 | Populations shrink, gene flow falls, and disease or disaster can wipe them out more easily. | Each small patch supports few individuals, and long inbreeding weakens the population. |
| 10 | The test is whether they can mate and produce fertile young; looks are only a hint. | A species is defined by reproduction, not similarity; dogs and wolves look different yet are close relatives. |
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.