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. Chromoplasts
- B. Chromatophores
- C. Leucoplasts
- D. Chloroplasts.
Explanation: Photosynthetic bacteria, often referred to as photosynthetic prokaryotes, are unique microorganisms capable of photosynthesis.
Correct answer: Chromatophores- A. Plantae
- B. Protista
- C. Monera
- D. Fungi
Explanation: The five-kingdom classification system was an earlier system used to classify living organisms into five main groups based on their…
Correct answer: Monera- A. Bacteriophages released from the donor bacterial strain.
- B. Another bacterium having special organ for conjugation.
- C. Physical contact between donor and recipient strains.
- D. Conjugation between opposite strain bacterium.
Explanation: The transfer of genetic information from one bacterium to another in transduction occurs through bacteriophages.
Correct answer: Bacteriophages released from the donor bacterial strain.- A. double stranded and linear
- B. Double stranded and circular
- C. Single stranded and linear
- D. Single stranded and circular
Explanation: The DNA of Escherichia coli (E. coli) is double-stranded and circular. Let's explain each option and provide the correct answer with…
Correct answer: Double stranded and circular- A. Chemosynthesis.
- B. Digestion or breakdown of organic compounds.
- C. Photosynthesis.
- D. Assimilation of nitrogenous compounds.
Explanation: Bacteria play a crucial role in the carbon cycle, primarily through the digestion or breakdown of organic compounds.
Correct answer: Digestion or breakdown of organic compounds.166. A few organisms are known to grow and multiply at temperatures of 100 to 105 oC. They belong to:
- A. Thermophilic sulphur bacteria.
- B. Hot spring bluegreen algae.
- C. Methanogenic archaebacteria.
- D. Marine archaebacteria.
Explanation: Organisms that are known to grow and multiply at temperatures of 100 to 105°C are typically thermophilic and are often associated with…
Correct answer: Thermophilic sulphur bacteria.- A. Nostoc.
- B. Azospirillum.
- C. Rhizobium.
- D. Azotobacter.
Explanation: The correct answer is d. Azotobacter. Let's explain each option and provide more details: a.
Correct answer: Azotobacter.- A. Ribosome.
- B. Microsome.
- C. Episome.
- D. Mesosome.
Explanation: The site of respiration in bacteria is not associated with any of the options provided.
Correct answer: Mesosome.- A. Single stranded DNA.
- B. Double stranded DNA.
- C. DNA
- D. RNA
Explanation: The hereditary material present in the bacterium Escherichia coli (E. coli) is primarily b. Double-stranded DNA.
Correct answer: Double stranded DNA.- A. Acidic protein.
- B. Actin.
- C. Histones.
- D. Basic protein.
Explanation: In bacteria, genes are packaged into the bacterial chromosome by D. Basic protein.
Correct answer: Basic protein.- A. Green algae and ascomycetes.
- B. Brown algae and higher plant.
- C. Green algae and basidiomycetes.
- D. Red algae and ascomycetes.
Explanation: Most lichens consist of A. Green algae and ascomycetes. Let's explain each option and provide more details: Green algae and ascomycetes…
Correct answer: Green algae and ascomycetes.- A. Double helical DNA.
- B. RNA
- C. Single helix DNA.
- D. None of these
Explanation: The genetic material in the influenza virus is B. RNA.Let's explain each option and provide more details:Double helical DNA (A):Influenza…
Correct answer: RNA- A. Sex pili
- B. Plasmid
- C. Circular DNA
- D. Gametes
Explanation: The term "sex organs" is not applicable to bacteria in the same way it is to sexually reproduce multicellular organisms.
Correct answer: Sex pili- A. Circular free DNA.
- B. Membrane bound DNA.
- C. Straight DNA.
- D. Helical DNA.
Explanation: The type of DNA found in bacteria is a. Circular free DNA. Let's explain each option and provide more details: Circular free DNA (a): This…
Correct answer: Circular free DNA.- A. These grow very rapidly (2 cm per day).
- B. They show fungal and algal symbiotic relationships.
- C. Some of its species are eaten by reindeers.
- D. These are pollution indicators.
Explanation: The incorrect statement about lichens is a. These grow very rapidly (2 cm per day).
Correct answer: These grow very rapidly (2 cm per day).- A. Parasitic association between roots and some fungi.
- B. Symbiotic relationship between fungi and roots of some higher plants.
- C. Symbiosis of algae and fungi.
- D. Relation of ants with the stem of some trees.
Explanation: Mycorrhiza is correctly described as b. Symbiotic relationship between fungi and roots of some higher plants.
Correct answer: Symbiotic relationship between fungi and roots of some higher plants.- A. Motile on surface of bacteria.
- B. Non-motile.
- C. Motile on surface of plant leaves.
- D. Actively motile in water.
Explanation: The tailed bacteriophages are B. Non-motile.Let's explain each option and provide more details:Motile on the surface of bacteria (A):This…
Correct answer: Non-motile.- A. Azotobacter
- B. Chemolithotrophs
- C. Mycoplasma
- D. Pseudomonas
Explanation: Let's explain each option individually: a) Azotobacter: Azotobacter is a genus of free-living, nitrogen-fixing bacteria.
Correct answer: Chemolithotrophs- A. Single stranded RNA
- B. Double stranded DNA
- C. Proteinaceous
- D. Double stranded RNA
Explanation: Let's explain each option individually:a) Single-stranded RNA:This option is correct.
Correct answer: Single stranded RNA- A. Overall similarities
- B. Utilitarian system
- C. Habits of plants
- D. Common evolutionary descent
Explanation: Let's explain each option individually: a) Overall similarities: Phylogenetic classification is not solely based on overall similarities…
Correct answer: Common evolutionary descent