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Quiz Chapter 8: Biodiversity

10 questions ยท Form 5 Biology Bab 8: Biodiversity

Question 1 of 10Score: 0

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

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 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.

2. 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).

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. What type of diagram illustrates the evolutionary relationships and common ancestry among biological species?

  1. Dichotomous key
  2. Phylogenetic tree
  3. Food web
  4. Ecological pyramid
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Answer: B

A phylogenetic tree displays evolutionary pathways and shared ancestry between different taxa.

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 bacterial process converts nitrate ions in anaerobic soil back into atmospheric nitrogen gas?

  1. Nitrification
  2. Nitrogen fixation
  3. Ammonification
  4. Denitrification
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Answer: D

Denitrifying bacteria (e.g., Pseudomonas denitrificans) convert nitrates into N2 gas under anaerobic conditions.

7. Which bacterium lives symbiotically inside root nodules of leguminous plants to fix atmospheric nitrogen?

  1. Rhizobium sp.
  2. Nitrosomonas sp.
  3. Escherichia coli
  4. Lactobacillus sp.
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Answer: A

Rhizobium sp. fixes atmospheric nitrogen gas into ammonium ions inside legume root nodules.

8. Which tool uses paired contrasting physical characteristics to identify unknown biological specimens?

  1. Phylogenetic tree
  2. Dichotomous key
  3. Cladogram
  4. Taxonomic hierarchy
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Answer: B

A dichotomous key provides series of two-choice structural statements leading to specimen identification.

9. Which micro-organism is used in genetic engineering to mass-produce human insulin for diabetes treatment?

  1. Escherichia coli
  2. Saccharomyces cerevisiae
  3. Nitrobacter sp.
  4. Plasmodium falciparum
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Answer: A

Recombinant DNA technology inserts the human insulin gene into Escherichia coli bacteria for industrial production.

10. What is the correct way to write the scientific name of the Asian elephant according to binomial nomenclature rules when typed?

  1. Elephas Maximus
  2. elephas maximus
  3. Elephas maximus
  4. Elephas Maximus
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Answer: C

The genus name starts with a capital letter, the species epithet is lowercase, and both words must be italicized in print.

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