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. Egg
- B. Rod and round
- C. Ball
- D. None of these
Explanation: Coccobacilli are Rod shaped bacteria with spherical ends like cocci.
Correct answer: Rod and round- A. Robert Koch
- B. Louis Pasteur
- C. Alexander Fleming
- D. Leeuwenhock
Explanation: Antonie Van Leeuwenhoek coined the term animalcules.
Correct answer: Leeuwenhock- A. A specific organism can always be found in association with a given disease
- B. The organism can be isolated and grown in pure culture in the laboratories
- C. It is possible to recover the organism in pure culture from the experimentally infected animals.
- D. The pure culture cannot produce the disease when inoculated into susceptible animal.
Explanation: Koch's fourth postulate states that the pure culture of the isolated microorganism should be capable of reproducing the disease when…
Correct answer: The pure culture cannot produce the disease when inoculated into susceptible animal.- A. Spirochete
- B. Escherichia
- C. Pseudomonas
- D. Campylobacter
Explanation: Campylobacter is a genus of bacteria that includes several species, such as Campylobacter jejuni and Campylobacter coli.
Correct answer: Campylobacter- A. Tuberculosis and Typhoid
- B. Tuberculosis and Cholera
- C. Tuberculosis and Measles
- D. All of above
Explanation: Robert Koch discovered the bacteria that cause several diseases, including tuberculosis and cholera.
Correct answer: Tuberculosis and Cholera- A. Spores can be located outside the vegetative cells
- B. Spores exhibit resistance to harsh environmental conditions
- C. Spores can form within vegetative cells
- D. Spores can never germinate into vegetative cells
Explanation: Bacterial spores, especially endospores, are highly resistant structures formed by certain bacteria such as those in the genera Bacillus…
Correct answer: Spores can never germinate into vegetative cells- A. Flagella
- B. Pili
- C. Trichomes
- D. Plasmids
Explanation: The correct answer is Pili. Pili are hollow, non-helical, filamentous structures found on the surface of many bacteria.
Correct answer: Pili- A. Motility
- B. Conjugation
- C. Chemical detection
- D. Attachment to surfaces
Explanation: The correct answer is Conjugation. Pili are specialized structures in bacteria used to connect two cells and facilitate the transfer of…
Correct answer: Conjugation- A. Eubacteria
- B. Archaeobacteria
- C. Cyanobacteria
- D. None of the above
Explanation: Eubacteria, or true bacteria, are a major group of prokaryotic microorganisms characterized by their peptidoglycan-containing cell walls…
Correct answer: Eubacteria- A. Spores
- B. Cysts
- C. Granules
- D. All of the Above
Explanation: Spores are the most heat-resistant structures formed by certain bacteria, allowing them to endure extreme environmental conditions…
Correct answer: Spores- A. Cell wall
- B. Cell membrane
- C. Slime layer
- D. Capsule
Explanation: The cell membrane is the most delicate part of the bacterial cell because it is thin and flexible.
Correct answer: Cell membrane- A. PS-I
- B. PS-II
- C. Both A and B
- D. None
Explanation: The correct answer is Option C: Both A and B. Cyanobacteria and eukaryotes share Photosystem I (PSI) and Photosystem II (PSII) as part of…
Correct answer: Both A and B- A. 0.75-1.25 μm
- B. 100-200 nm
- C. 0.1-600 μm
- D. 500 μm
Explanation: The correct answer is Option D: 500 μm. Spirochetes are known for their unique spiral shape and can vary significantly in size.
Correct answer: 500 μm- A. Epulopiscium fishelsoni
- B. Pseudomonas aeruginosa
- C. Escherichia coli
- D. Streptococcus pneumoniae
Explanation: The correct answer is Epulopiscium fishelsoni, which is one of the largest known bacteria, reaching lengths up to 0.5 millimeters…
Correct answer: Epulopiscium fishelsoni- A. CO2 cycle
- B. Nitrogen cycle
- C. Phosphorus cycle
- D. All of the above
Explanation: Bacteria are indispensable in various biogeochemical cycles. In the carbon cycle, they decompose organic matter, releasing carbon dioxide.
Correct answer: All of the above- A. Within nucleolus
- B. Prior to fission
- C. Just before transcription
- D. During S phase
Explanation: In bacteria, DNA replication occurs just prior to binary fission, ensuring that each daughter cell receives a complete set of genetic…
Correct answer: Prior to fission- A. It protects the bacterium from desiccation
- B. Provides pathogenicity to bacteria
- C. It allows bacterium to "hide" from host's immune system
- D. It allows the bacterium to attach to the surface
- E. All
Explanation: A bacterial capsule is advantageous to a bacterium, particularly in terms of pathogenicity, for the following reasons:1.
Correct answer: All- A. It forms a bridge between two bacterial cells
- B. It involves the transport of genetic material via vectors
- C. It is a form of sexual reproduction
- D. None of these
Explanation: Bacterial conjugation is a mechanism of horizontal gene transfer where genetic material, typically plasmid DNA, is directly transferred…
Correct answer: It involves the transport of genetic material via vectors- A. Choanoflagellates
- B. Trypanosoma
- C. Trichonymphas
- D. Paramecium
Explanation: Trypanosoma is a protozoan that causes African sleeping sickness, transmitted by the tsetse fly.
Correct answer: Trypanosoma- A. Chrysophyta
- B. Pyrophyta
- C. Rhodophyta
- D. Phaeophyta
Explanation: Pinnularia is part of the diatom group, which falls under the Chrysophyta division.
Correct answer: Chrysophyta