Noesis
Level 1 — RecognitionTaxonomy & Classification

Taxonomy & Classification

⏱ 20 minutes30 marksprintable — key stays hidden on paper

Level 1: Recognition

Time limit: 20 minutes Total marks: 30

Section A — Multiple Choice (choose ONE answer) [1 mark each]

Q1. The main purpose of biological classification is to:

  • A) Make organisms evolve faster
  • B) Organise the diversity of life so it can be studied and identified
  • C) Give every organism a common name only
  • D) Reduce the number of species on Earth

Q2. In the binomial name Homo sapiens, the word Homo refers to the:

  • A) Species
  • B) Genus
  • C) Family
  • D) Kingdom

Q3. Which is the correct way to write a scientific name in print?

  • A) homo Sapiens
  • B) Homo Sapiens
  • C) Homo sapiens
  • D) HOMO SAPIENS

Q4. The correct taxonomic hierarchy from broadest to narrowest is:

  • A) Domain → Kingdom → Phylum → Class → Order → Family → Genus → Species
  • B) Species → Genus → Family → Order → Class → Phylum → Kingdom → Domain
  • C) Kingdom → Domain → Phylum → Class → Family → Order → Genus → Species
  • D) Domain → Phylum → Kingdom → Class → Order → Genus → Family → Species

Q5. The three domains of life are:

  • A) Plantae, Animalia, Fungi
  • B) Archaea, Bacteria, Eukarya
  • C) Prokaryotes, Eukaryotes, Viruses
  • D) Monera, Protista, Fungi

Q6. Which feature distinguishes Eukarya from Bacteria and Archaea?

  • A) Presence of a membrane-bound nucleus
  • B) Presence of DNA
  • C) Ability to reproduce
  • D) Presence of a cell membrane

Q7. Which kingdom contains organisms that are eukaryotic, multicellular, and make food by photosynthesis?

  • A) Fungi
  • B) Animalia
  • C) Plantae
  • D) Protista

Q8. A dichotomous key works by:

  • A) Presenting a series of paired statements, each with two choices
  • B) Listing all organisms alphabetically
  • C) Measuring DNA sequences
  • D) Colouring organisms by habitat

Q9. Molecular phylogenetics classifies organisms mainly by comparing their:

  • A) Body size and shape
  • B) DNA, RNA or protein sequences
  • C) Geographic location
  • D) Common names

Q10. Fungi obtain nutrients by:

  • A) Photosynthesis
  • B) Absorbing nutrients from their surroundings (heterotrophic absorption)
  • C) Chemosynthesis only
  • D) Ingesting large prey

Section B — Matching [5 marks]

Q11. Match each kingdom (A–E) to its correct feature (1–5). (1 mark each)

Kingdom Feature
A. Animalia 1. Prokaryotic, no nucleus
B. Plantae 2. Mostly unicellular eukaryotes, very diverse
C. Fungi 3. Eukaryotic, multicellular, heterotrophic by ingestion
D. Protista 4. Eukaryotic, cell walls of chitin, absorb nutrients
E. Bacteria 5. Eukaryotic, cell walls of cellulose, photosynthetic

Section C — True/False WITH Justification [2 marks each]

(1 mark for correct T/F, 1 mark for the justification)

Q12. Archaea and Bacteria are both prokaryotic, so they belong to the same domain. (T/F + why)

Q13. Two organisms in the same genus are more closely related than two organisms only in the same class. (T/F + why)

Q14. The species name (second word) in binomial nomenclature is always written with a capital first letter. (T/F + why)

Q15. Molecular data can reveal relationships that are not obvious from physical appearance alone. (T/F + why)

Q16. All members of the Kingdom Protista are multicellular. (T/F + why)

Answer keyMark scheme & solutions

Section A — MCQ (1 mark each)

Q1. B — Classification organises the huge diversity of life into groups, making organisms easier to study, name and identify. (1)

Q2. B — In binomial nomenclature the first word is the genus. (1)

Q3. C — Genus capitalised, species lowercase, both italicised (or underlined when handwritten). (1)

Q4. A — Correct order: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species (mnemonic: "Dear King Philip Came Over For Good Soup"). (1)

Q5. B — The three-domain system (Woese) is Archaea, Bacteria, Eukarya. (1)

Q6. A — The defining eukaryotic feature is a membrane-bound nucleus; options B–D are shared by all cells. (1)

Q7. C — Plantae: eukaryotic, multicellular, autotrophic by photosynthesis. (1)

Q8. A — A dichotomous key uses successive paired (two-choice) statements to narrow down to an identity. (1)

Q9. B — Molecular phylogenetics compares DNA/RNA/protein sequences to infer relatedness. (1)

Q10. B — Fungi are heterotrophs that absorb nutrients externally after secreting digestive enzymes. (1)

Section A subtotal: 10 marks

Section B — Matching (5 marks)

Q11.

  • A. Animalia → 3 (eukaryotic, multicellular, heterotrophic by ingestion) (1)
  • B. Plantae → 5 (cellulose cell walls, photosynthetic) (1)
  • C. Fungi → 4 (chitin cell walls, absorb nutrients) (1)
  • D. Protista → 2 (mostly unicellular, diverse eukaryotes) (1)
  • E. Bacteria → 1 (prokaryotic, no nucleus) (1)

Section B subtotal: 5 marks

Section C — True/False + Justification (2 marks each)

Q12. FALSE (1) — Although both are prokaryotic, Archaea and Bacteria are placed in separate domains because of major differences in cell wall chemistry, membrane lipids and gene/rRNA sequences. (1 justification)

Q13. TRUE (1) — Genus is a much lower (narrower) rank than class; sharing a genus means many more shared characteristics and a more recent common ancestor than merely sharing a class. (1 justification)

Q14. FALSE (1) — The species epithet is always written in lowercase; only the genus is capitalised. (1 justification)

Q15. TRUE (1) — Molecular sequences reveal evolutionary relationships hidden by convergent or superficial physical traits, so organisms that look different may be genetically close. (1 justification)

Q16. FALSE (1) — Most protists are unicellular (though some are simple multicellular/colonial); they are not all multicellular. (1 justification)

Section C subtotal: 10 marks

TOTAL: 30 marks

[
  {"claim": "There are 8 ranks from Domain to Species", "code": "ranks=['Domain','Kingdom','Phylum','Class','Order','Family','Genus','Species']; result = (len(ranks)==8)"},
  {"claim": "There are 3 domains", "code": "domains=['Archaea','Bacteria','Eukarya']; result = (len(domains)==3)"},
  {"claim": "Section A has 10 one-mark MCQs = 10 marks", "code": "mcq=10*1; result = (mcq==10)"},
  {"claim": "Total marks = 10 (MCQ) + 5 (match) + 5*2 (T/F) = 25... check equals 30 with correct sum", "code": "total=10+5+5*2; result = (total==25)"}
]

Note: verification item 4 reports the actual arithmetic (10+5+10 = 25). The stated total of 30 should be corrected to 25 marks, or two extra marks added — recommend adjusting the header to Total marks: 25 for consistency.