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Quiz Chapter 8: Biodiversity

10 questions · Form 5 Biology Bab 8: Biodiversity

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which taxonomic ranking represents the broadest and most inclusive level in modern biological classification?

  1. Domain
  2. Kingdom
  3. Phylum
  4. Species
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Answer: A

Domain is the highest and most inclusive taxonomic rank above Kingdom.

2. Which microorganism is utilized in the commercial production of yogurt via lactic acid fermentation?

  1. Saccharomyces cerevisiae
  2. Lactobacillus sp.
  3. Penicillium chrysogenum
  4. Rhizopus sp.
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Answer: B

Lactobacillus sp. ferments lactose sugar in milk into lactic acid, producing yogurt.

3. Which microorganism plays a vital role in converting nitrite ions into nitrate ions in the nitrogen cycle?

  1. Rhizobium sp.
  2. Nitrosomonas sp.
  3. Nitrobacter sp.
  4. Azotobacter sp.
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Answer: C

Nitrobacter sp. oxidized nitrites (NO2-) into nitrates (NO3-) during nitrification.

4. Which organism is a photosynthetic unicellular protist possessing a flagellum and a light-sensitive eyespot?

  1. Amoeba sp.
  2. Euglena sp.
  3. Paramecium sp.
  4. Plasmodium sp.
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Answer: B

Euglena sp. is a flagellated unicellular protist containing chloroplasts.

5. Why are viruses excluded from the six-kingdom classification system?

  1. They lack genetic material
  2. They are obligate non-cellular entities requiring host cell machinery to reproduce
  3. They possess cell walls made of chitin
  4. They carry out autotrophic photosynthesis
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Answer: B

Viruses are non-living, non-cellular particles consisting only of nucleic acid and a capsid; they can reproduce only inside host cells.

6. What is the primary action of Nitrosomonas sp. in the nitrogen cycle?

  1. Fixes N2 gas into ammonium ions
  2. Oxidizes ammonium ions into nitrite ions
  3. Converts nitrite ions into nitrate ions
  4. Reduces nitrate ions into N2 gas
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Answer: B

Nitrosomonas sp. converts ammonium ions (NH4+) into nitrite ions (NO2-).

7. What primary feature distinguishes kingdom Protista from kingdom Eubacteria?

  1. Presence of cell walls
  2. Presence of a membrane-bound nucleus (eukaryotic cell structure)
  3. Ability to carry out locomotion
  4. Ability to cause human diseases
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Answer: B

Protists are eukaryotic (have a membrane-bound nucleus), whereas eubacteria are prokaryotic (lack a nucleus).

8. To which kingdom do mushrooms, yeast, and bread molds belong?

  1. Plantae
  2. Protista
  3. Fungi
  4. Eubacteria
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Answer: C

Fungi are heterotrophic eukaryotic organisms with cell walls made of chitin.

9. Which kingdom includes unicellular prokaryotes adapted to live in extreme environments like hot thermal springs and salt lakes?

  1. Archaebacteria
  2. Eubacteria
  3. Fungi
  4. Protista
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Answer: A

Archaebacteria are extremophiles capable of surviving high salinity, extreme temperatures, or acidic conditions.

10. What term describes the biological cleanup method of using microorganisms to neutralize marine oil spills?

  1. Eutrophication
  2. Bioremediation
  3. Biological control
  4. Ammonification
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Answer: B

Bioremediation uses microorganisms or plants to break down and remove environmental pollutants.

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