Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Candida utilis
- B. Azotobacter suboxydans
- C. Aspergillus niger
- D. Streptococcus lactis
Explanation: 'Citric acid' is obtained through the fermentation carried out by Aspergillus niger on sugary syrups.
Correct answer: Aspergillus niger- A. Aspergillus
- B. Saccharomyces
- C. Pseudomonas
- D. Penicillium
Explanation: Saccharomyces converts starch or sugars to pyruvic acid through EMP pathway.
Correct answer: Saccharomyces- A. The ripening only.
- B. The souring of milk only.
- C. The development of resistance to spoilage only.
- D. Both the souring and the ripening processes.
Explanation: The souring of milk is primarily attributed to the activity of lactic acid bacteria (LAB), which are a type of microorganism.
Correct answer: Both the souring and the ripening processes.- A. Fungi
- B. Mosses and Ferns
- C. Algae
- D. Lichens
Explanation: Fungi is a large kingdom of over 72,000 species. They are achlorophyllous, heterotrophic, spore-forming, nonvascular, eukaryotic…
Correct answer: Fungi- A. Temperature
- B. Food
- C. Light
- D. Water
Explanation: Plants show better growth in water because water is essential for photosynthesis, transporting nutrients, and keeping the plant cells firm…
Correct answer: Water1666. The feature that is similar in both phylums, Ascomycota and Basidiomycota, of the kingdom fungi is:
- A. Presence of septate hyphae
- B. Absence of sexual reproduction
- C. Use of conidia for asexual reproduction
- D. Occurrence of right sexual spores in internal sacs
Explanation: The key similarity between Ascomycota and Basidiomycota is the presence of septate hyphae.
Correct answer: Presence of septate hyphae- A. Apothecium
- B. Perithecium
- C. Clesitothecium
- D. Pseudothecium
Explanation: In Ascomycetes, a Cleistothecium is a round or oval fruiting body that is completely enclosed, meaning it lacks any external opening.
Correct answer: Clesitothecium- A. Plasmogamy, Karyogamy, Meiosis
- B. Karyogamy, Plasmogamy, Meiosis
- C. Plasmogamy, Karyogamy, Mitosis
- D. Karyogamy, Plasmogamy, Mitosis
Explanation: In Zygomycota, plasmogamy is the fusion of the cytoplasm of two compatible mating types during sexual reproduction, followed by karyogamy…
Correct answer: Plasmogamy, Karyogamy, Meiosis- A. Lichen
- B. Mycorrhizae
- C. Saprophytic molds
- D. Parasitic mildews
Explanation: The term mycorrhizae refers to a symbiotic association between fungi and the roots of a plant.
Correct answer: Mycorrhizae- A. Yeast
- B. Rhizopus
- C. Mushroom
- D. Penicillium
Explanation: The diagram shows a branched, brush-like conidiophore with chains of conidia-this is the classic structure of Penicillium.
Correct answer: Penicillium- A. Ascomycota
- B. Zygomycota
- C. Basidiomycota
- D. Deuteromycota
Explanation: The correct answer is ascomycota. Fungi in the Ascomycota phylum are known for their distinctive sexual reproductive structure, the ascus…
Correct answer: Ascomycota- A. A
- B. B
- C. C
- D. D
Explanation: The correct match is: Fungal Hypha=N (Haploid) or N + N (Dikaryotic/Heterokaryotic) Zygote=2N (Diploid) So the correct match is option C…
Correct answer: C- A. Yeast
- B. Rhizopus
- C. Mushroom
- D. Penicillium
Explanation: The correct answer is Rhizopus. Rhizopus is known for its filamentous structure, which appears as a tangled mass of hyphae under the…
Correct answer: Rhizopus- A. Absence of chitin
- B. Presence of conidia
- C. Absence of sexual reproduction
- D. Presence of absorptive nutrition
Explanation: Deuteromycetes differ from other fungi because they lack a known sexual reproductive stage.
Correct answer: Absence of sexual reproduction- A. Fungi: starch, Plant: glycogen
- B. Fungi: glycogen, Plant: starch
- C. Fungi: glycogen, Plant: glycogen
- D. Fungi: starch, Plant: starch
Explanation: The correct answer is that fungi store food as glycogen and plants store food as starch.
Correct answer: Fungi: glycogen, Plant: starch- A. Yeast
- B. Rhizopus
- C. Mushroom
- D. Penicillium
Explanation: The correct answer is Option B: Rhizopus. Rhizopus species are part of the Zygomycetes class of fungi, which are characterized by having…
Correct answer: Rhizopus- A. Meiosis occurs in the gills of basidiocarp
- B. Germination of basidiospores takes place in the basidiocarp
- C. Plasmogamy occurs between positive and negative mating types
- D. Karyogamy in the basidia leads to the formation of diploid nuclei
Explanation: Plasmogamy is the fusion of the cytoplasm between two compatible primary, haploid mycelia (often designated as positive and negative…
Correct answer: Plasmogamy occurs between positive and negative mating types- A. Mutualism
- B. Predation
- C. Commensalism
- D. Decomposition
Explanation: The correct answer is predation. In this scenario, the oyster mushroom actively hunts and consumes the nematodes, absorbing their…
Correct answer: Predation- A. I only
- B. II only
- C. III only
- D. II and III
Explanation: The correct answer is 'I only.' Lichens are a mutualistic association between green algae and fungal species of ascomycetes.
Correct answer: I only- A. A cell wall
- B. Nuclear mitosis
- C. Centrioles in cells
- D. Heterotrophic mode of nutrition
Explanation: The correct answer is B: nuclear mitosis. Fungi are unique in that they perform nuclear mitosis, where their nuclear envelope remains…
Correct answer: Nuclear mitosis