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. Isogamy
- B. Anisogamy
- C. Oogamy
- D. All of these
Explanation: d. In Chlorophyceae, the mode of sexual reproduction can be all of these-Isogamy, Anisogamy, and Oogamy.
Correct answer: All of these- A. Spirogyra
- B. Nostoc
- C. Ulothrix
- D. Volvox
Explanation: b. Nostoc belongs to Cyanophyceae. In this entire class sexual reproduction is completely absent.
Correct answer: Nostoc- A. Some diatoms and several cyanobacteria
- B. Some cyanobacteria and many diatoms
- C. Everal cyanobacteria and several diatoms
- D. Several diatoms and a few cyanobacteria.
Explanation: d. Until 1907, auxospore formation was regarded as asexual process but now it is considered as an act of sexual process.
Correct answer: Several diatoms and a few cyanobacteria.- A. Four
- B. Five
- C. Six
- D. Three
Explanation: The autotrophs in the list given are: Nostoc Chara Porphyra Wolffia Autotrophs are organisms that can synthesize their own organic…
Correct answer: Four- A. Chromosome
- B. Plasmid
- C. Nucleoid
- D. Mitochondria
Explanation: The correct answer is the nucleoid. In prokaryotic cells, the nucleoid is the region where the cell's chromosomal DNA is concentrated.
Correct answer: Nucleoid- A. Autotroph
- B. Heterotroph
- C. Decomposer
- D. None
Explanation: The correct answer is: a) Autotroph.Cyanobacteria are classified as autotrophs because they have the capability to produce their own food…
Correct answer: Autotroph- A. Long chain of cells
- B. Types of division
- C. Shape
- D. All of the above
Explanation: The arrangements of cocci are determined by how they divide and remain connected.
Correct answer: All of the above- A. Sacrinae
- B. Tetrad
- C. Staphylococcus
- D. All of the above
Explanation: The correct answer is Sacrinae because when cocci undergo division in three planes, they form a cubic arrangement of 8 cells.
Correct answer: Sacrinae- A. E. coli
- B. Vibrio
- C. Mycoplasma
- D. Bacillus
Explanation: The correct answer is Vibrio, which refers to bacteria that are characteristically comma-shaped. E.
Correct answer: Vibrio- A. Spirochete
- B. E. coli
- C. Pseudomonas
- D. Streptococcus
Explanation: The correct answer is Spirochete because they are spiral-shaped bacteria.
Correct answer: Spirochete- A. Four
- B. Five
- C. Six
- D. Three
Explanation: Photoautotrophs are organisms that can synthesize their own food using sunlight as an energy source.
Correct answer: Four- A. 175 x 10^5 cells/ml
- B. 5 x 10^5 cells/ml
- C. 35 x 10^5 cells/ml
- D. 32 x 10^5 cells/ml
Explanation: The bacterium divides every 36 minutes. The total time given is 180 minutes.
Correct answer: 32 x 10^5 cells/ml- A. Cytoplasm
- B. Nuclear membrane
- C. RER
- D. Cell Wall
Explanation: The correct answer is A) Cytoplasm, as bacterial ribosomes are found in the cytoplasm of the cell where they carry out protein synthesis.
Correct answer: Cytoplasm- A. Mode of nutrition
- B. Mode of respiration
- C. Pigment composition
- D. Cell wall composition
Explanation: The correct answer is D) Cell wall composition, as bacteria and cyanobacteria both have cell walls containing peptidoglycan, making them…
Correct answer: Cell wall composition2435. Basophilic prokaryotes :
- A. Grow and multiply in very deep marine sediments
- B. Occur in water containing high concentrations of barium hydroxide
- C. Readily grow and divide in sea water enriched in any soluble salt of barium
- D. Grow slowly in highly alkaline frozen lakes at high altitudes
Explanation: All options are explained below:a)Basophilic prokaryotes are known for their ability to grow and multiply in very deep marine…
Correct answer: Grow and multiply in very deep marine sediments- A. Bacteria
- B. Actinomycetes
- C. Fungi
- D. Laboratory
Explanation: Answer is "Laboratory"Explanation: Synthetic antibiotics.
Correct answer: Laboratory- A. Actinomycetes
- B. Fungi
- C. Bacteria
- D. Actinomycetes, Bacteria and Fungi
Explanation: Answer is "Actinomycetes, bacteria and fungi"Explanation: Biological antibiotics are produced by certain fungi actinomycetes and bacteria…
Correct answer: Actinomycetes, Bacteria and Fungi- A. Oscillatoria
- B. Rhodospirillum
- C. Chlorobium
- D. Chromatium
Explanation: In summary, oxygenic photosynthesis occurs in organisms like cyanobacteria (e.g., Oscillatoria), which produce oxygen as a byproduct…
Correct answer: Oscillatoria- A. Azotobacter
- B. Frankia
- C. Azolla
- D. Glomus
Explanation: Azotobacter: Azotobacter is a free-living nitrogen-fixing bacterium. It forms a symbiotic relationship with some plants, especially in the…
Correct answer: Frankia- A. Alternaria
- B. Erwinia
- C. Xanthomonas
- D. Pseudomonas
Explanation: Bacterial leaf blight of rice is primarily caused by a species of Xanthomonas. Here's an explanation of each of the options:1.
Correct answer: Xanthomonas