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. Autotrophs
- B. Decomposers
- C. Parasites
- D. Photosynthetic
Explanation: Option B is correct.Saprophytic bacteria are decomposers. Decomposers are organisms that break down dead organic matter.
Correct answer: Decomposers2282. Salmonella typhi causing typhoid and Clostridium tetani causing tetanus are which type of bacteria?
- A. Bacilli
- B. Spirilla
- C. Cocci
- D. Comma
Explanation: Option A is correct.Salmonella typhi and Clostridium tetani are both bacilli. Bacilli are rod-shaped bacteria.
Correct answer: Bacilli- A. Dry Heat
- B. Moist Heat
- C. Filtration
- D. Ultraviolet Radiation
Explanation: This is the correct answer. Dry heat is a method of sterilization that involves exposing microorganisms, including bacteria, to high…
Correct answer: Dry Heat- A. 1-2 weeks
- B. 2-3 weeks
- C. 3-4 weeks
- D. 7 days
Explanation: The incubation period of syphilis, which is the time between exposure to the bacteria (Treponema pallidum) and the appearance of symptoms…
Correct answer: 2-3 weeks- A. Teichoic acids
- B. Lipids
- C. Peptidoglycan
- D. Periplasmic space
Explanation: Teichoic acids are unique components found only in the cell walls of Gram-positive bacteria.
Correct answer: Teichoic acids- A. Capsulated and S-Type
- B. Non-capsulated and S-Type
- C. Capsulated and R-Type
- D. Non-capsulated and R-Type
Explanation: Streptococcus pneumoniae strains are classified into two main types based on their capsule:- S-type (Smooth-type): Capsulated, virulent…
Correct answer: Non-capsulated and R-Type- A. Capsule
- B. Slime
- C. Glycocalyx
- D. Spore
Explanation: The capsule is an additional covering that surrounds the cell wall of some bacteria, providing protection against:- Phagocytosis…
Correct answer: Capsule- A. Transduction
- B. Transformation
- C. Conjugation
- D. Both a and b
Explanation: Conjugation is the process of genetic exchange between bacteria that involves direct cell-to-cell contact between the bacterial cells.
Correct answer: Conjugation- A. Protista
- B. E.coli
- C. Amoeba
- D. Fungi
Explanation: E. coli (Escherichia coli) is a type of bacteria, which is a prokaryote.
Correct answer: E.coli2290. Endospore formation is _
- A. A reproductive process
- B. A vegetative process
- C. Can be reproductive or vegetative depending on the conditions
- D. Is related to invading host cells
Explanation: Endospore formation is a survival mechanism used by certain bacteria, such as Bacillus and Clostridium species, to withstand harsh…
Correct answer: A vegetative process- A. Phenol
- B. Spirit
- C. Pencilin
- D. Sulphuric Acid
Explanation: Correct, as it is an antibiotic that inhibits bacterial cell wall synthesis.
Correct answer: Pencilin- A. Mitochondria
- B. Nucleus
- C. Golgi apparatus
- D. Ribosomes
Explanation: Ribosomes - Correct. Prokaryotic cells have ribosomes (70S type) for protein synthesis, though they are smaller than eukaryotic ribosomes.
Correct answer: Ribosomes- A. Green
- B. Blue
- C. Yellow
- D. Red
Explanation: Blue - Correct. Phycocyanin is a blue pigment found in cyanobacteria that assists in photosynthesis.
Correct answer: Blue- A. Mesosome
- B. Periplasm
- C. Ribosome
- D. Plasmid
Explanation: Mesosome - Correct. In prokaryotic cells, mesosomes are infoldings of the plasma membrane that perform functions similar to mitochondria…
Correct answer: Mesosome- A. Chemicals
- B. Drying
- C. Heat
- D. Radiation
Explanation: Radiation - Correct. Gamma or UV radiation is used to sterilize blood products without damaging them.
Correct answer: Radiation- A. Pili
- B. Membrane
- C. Flagella
- D. Tentacle
- E. Cilia
Explanation: The thin appendages that help bacteria in conjugation are pili. So option A is the correct answer.
Correct answer: Pili- A. Bacilli
- B. Trichomonas
- C. Neisseria gonorrhea
- D. Genital herpes
- E. Treponema palladium
Explanation: The correct answer is Option E. Syphilis is caused by a bacterium called Treponema pallidum.
Correct answer: Treponema palladium- A. CO2
- B. H2S
- C. S
- D. H
- E. O
Explanation: In sulfur photosynthetic bacteria, the substance that donates hydrogen is hydrogen sulfide (H2S) and not water.
Correct answer: S- A. Lophotrichous
- B. Peritrichous
- C. Atrichous
- D. Monotrichous
- E. Diplotrichous
Explanation: Peritrichous bacteria are those that have flagella distributed all over their surface.
Correct answer: Peritrichous- A. Lysosomes
- B. Mesosomes
- C. Golgi bodies
- D. Phragmoplasts
Explanation: Mesosomes are the structures formed by invagination of the plasma membrane and have been associated with cell division and DNA replication…
Correct answer: Mesosomes