Primary General Studies: Classifying Plants And Animals And Biodiversity (Paper 2 (intermediate))

Primary General Studies: Classifying Plants and Animals and Biodiversity (Paper 2 (intermediate))

2026-11-13

Tutor Prep Guide · rotation and revolution, planet order, moon phases and the cause of seasons

Primary General Studies: Classifying Plants and Animals and Biodiversity (Paper 2 (intermediate))

Paper two adds comparison and calculation: the gap between animal and plant species, the insect share of animals, leg counts for several insects, the share of resident birds in Hong Kong, and the three levels of biodiversity.

Direct answers　Write the formula before substituting numbers and check units at the end, so the answer can be judged reasonable at a glance.

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)

FoundationAbout one and a half million animal species are known and about four hundred thousand plant species. Where do animals lead?
FoundationHow do amphibians breathe when young and when adult?
FoundationWhat covers reptile skin and reduces water loss?
IntermediateThere are about 1500000 animal species and 400000 plant species. What is the gap?
IntermediateOf 1500000 known animals about 1200000 are insects. What percentage is that?
IntermediateHow many legs do three insects have altogether?
ChallengeHong Kong records 550 bird species and 110 are residents. What percentage are residents?
ChallengeWhat are the three levels of biodiversity?
ChallengeWhy are there more insect species than any other animal group?
Error redoA classmate says a crocodile lives in water so it is a fish. What is wrong?

03　Answers and one-line notes

#	Answer	One-line note
1	There are far more animal species than plant species, about one and a half million.	Insects make up most animal species and are the main reason animals are so numerous.
2	Gills when young, lungs as adults.	Frogs are the example, which is why they live near water.
3	Scales.	Scales stop water evaporating, so reptiles can live in dry places.
4	A gap of 1100000 species.	1500000 minus 400000 is 1100000.
5	80 per cent.	1200000 divided by 1500000 times one hundred gives 80 per cent.
6	18 legs.	Each has 6 and three times 6 is 18.
7	20 per cent.	110 divided by 550 times one hundred gives 20 per cent.
8	Species diversity, genetic diversity and ecosystem diversity.	All three levels count together; species numbers alone understate diversity.
9	Insects are small, breed fast and adapt easily, so they can use many different habitats.	A small body means one patch of land can hold many species, so species numbers rise.
10	A crocodile breathes with lungs, has scaly skin and lays eggs on land, so it is a reptile.	Where it lives is not the basis of classification; breathing and body structure are.

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 →

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.