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. Lysozymes
- B. Lipolytic
- C. Lytic
- D. Lysogenic
Explanation: Viruses that infect bacteria, multiply within them, and ultimately cause the lysis (bursting) of the bacterial host cells are called…
Correct answer: Lytic- A. Tolypothrix
- B. Chlorella
- C. Nostoc
- D. Anabaena
Explanation: a)Tolypothrix: Tolypothrix is another genus of filamentous cyanobacteria, but it is not typically associated with the water fern Azolla.
Correct answer: Anabaena- A. RNA primers are involved
- B. is facilitated by telomerase
- C. moves in one direction of the site
- D. moves in bidirectional way.
Explanation: During replication of a bacterial chromosome, DNA synthesis starts from a replication origin site and moves in a bidirectional way.
Correct answer: moves in bidirectional way.- A. 300 × 10 nm
- B. 300 × 5 nm
- C. 300 × 20 nm
- D. 700 × 30 nm.
Explanation: TMV is rod shaped measuring 300 × 20 nm. It is made of RNA and proteins.
Correct answer: 300 × 20 nm- A. They require both RNA and DNA
- B. They both need food molecules
- C. They both require oxygen for respiration
- D. Both require the environment of a cell to replicate.
Explanation: a)They require both RNA and DNA: This statement is not accurate. Viruses can have either RNA or DNA as their genetic material, not both.
Correct answer: Both require the environment of a cell to replicate.- A. Plantae
- B. Fungi
- C. Protista
- D. Monera
Explanation: a)Plantae: The Plantae kingdom includes all plants. These are multicellular, eukaryotic organisms that perform photosynthesis and have…
Correct answer: Monera- A. Transfer of some genes from one bacteria to another bacteria through virus.
- B. Transfer of genes from one bacteria to another bacteria by conjugation.
- C. Bacteria obtained its DNA directly from mother cell.
- D. Bacteria obtained DNA from other external source.
Explanation: a)Transfer of some genes from one bacteria to another bacteria through a virus (Correct): Bacterial transduction is a process where genes…
Correct answer: Transfer of some genes from one bacteria to another bacteria through virus.- A. Sigmoid
- B. Hyperbolic
- C. Ascending straight line
- D. Descending straight line
Explanation: a)Sigmoid (Correct): In a controlled laboratory environment, bacterial populations often exhibit a sigmoid growth curve.
Correct answer: Sigmoid- A. Natural selection
- B. Induced mutation
- C. Reproductive isolation
- D. Genetic drift.
Explanation: a)Natural Selection (Correct Answer): Bacteria can develop resistance to antibiotics through natural selection.
Correct answer: Natural selection- A. Extra chromosomal material
- B. Main DNA
- C. Non functional DNA
- D. Repetitive gene.
Explanation: a)Extra-Chromosomal Material: Plasmids are small, circular pieces of DNA that exist independently of the bacterial chromosome.
Correct answer: Extra chromosomal material- A. Lag, log, stationary, decline phase
- B. Lag, log, decline, stationary phase
- C. Stationary, lag, log, decline phase
- D. Decline, lag, log phase, stationary
Explanation: Lag, log, stationary, decline phase Here's an explanation of each stage: Lag Phase: In this phase, bacteria are adjusting to their new…
Correct answer: Lag, log, stationary, decline phase- A. Loose smut of wheat
- B. Corn smut
- C. Covered smut of barley
- D. Soft rot of potato
Explanation: a)The fungal disease that spreads by seed and flowers is "Loose smut of wheat." This disease is caused by the fungus Ustilago tritici and…
Correct answer: Loose smut of wheat- A. Aspergillus and Penicillium
- B. Colletotrichum
- C. Fusarium
- D. None of these
Explanation: a)Aspergillus and Penicillium: Both Aspergillus and Penicillium genera of fungi are known to produce mycotoxins, which can be harmful to…
Correct answer: Aspergillus and Penicillium- A. ss RNA
- B. ds RNA
- C. ds DNA
- D. ss DNA.
Explanation: a)ss RNA (single-stranded RNA): This option is incorrect for Cauliflower mosaic virus.
Correct answer: ds DNA- A. Oxygenic with nitrogenase
- B. Oxygenic without nitrogenase
- C. Non oxygenic with nitrogenase
- D. Non oxygenic without nitrogenase
Explanation: Cyanobacteria are gram negative prokaryotes which are popularly known as bluegreen algae.
Correct answer: Oxygenic with nitrogenase- A. All halophiles
- B. All photosynthetics
- C. All fossils
- D. Oldest living beings
Explanation: Archaebacteria, also known as Archaea, are a group of single-celled microorganisms that are distinct from both bacteria and eukaryotes.
Correct answer: Oldest living beings- A. Cell wall
- B. Cell membrane
- C. Ribosome
- D. Cytoplasm
Explanation: The primary difference between Gram-positive and Gram-negative bacteria is due to differences in their cell wall.
Correct answer: Cell wall- A. mechanical pressure and enzymes
- B. hooks and suckers
- C. softening by enzymes
- D. Only by mechanical pressure
Explanation: Fungal pathogens use various mechanisms to penetrate their host organisms.
Correct answer: mechanical pressure and enzymes- A. Puccinia
- B. Ustilago
- C. Albugo
- D. Phytophthora
Explanation: "Black rust of wheat" is a plant disease, and it is caused by a specific group of fungi.
Correct answer: Puccinia- A. Natural system
- B. Phylogenetic system
- C. Artificial system
- D. Synthetic system
Explanation: Natural System: A natural system of classification is based on overall similarity and considers a large number of traits.
Correct answer: Natural system