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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101. In which group of organisms the cell walls form two thin overlapping shells which fit together?
- A. Dinoflagellates
- B. Slime moulds
- C. Chrysophytes
- D. Euglenoids
Explanation: Dinoflagellates:Dinoflagellates are a group of protists, specifically algae.
Correct answer: Dinoflagellates- A. Some fungi are edible.
- B. Nuclear membrane is present in Monera.
- C. Cell wall is absent in Animalia.
- D. Protists have photosynthetic and heterotrophic modes of nutrition.
Explanation: The wrong statement is:2. Nuclear membrane is present in Monera.Explanation for each statement:1.
Correct answer: Nuclear membrane is present in Monera.- A. Morels and truffles are poisonous mushrooms.
- B. Yeast is unicellular and useful in fermentation.
- C. Penicillium is multicellular and produces antibiotics.
- D. Neurospora is used in the study of biochemical genetics.
Explanation: The wrong statement is: "Morels and truffles are poisonous mushrooms."Explanation of each statement:1.
Correct answer: Morels and truffles are poisonous mushrooms.- A. Vaucheria
- B. Volvox
- C. Anabaena
- D. Mucor
Explanation: True nucleus is absent in Vaucheria, Anabaena, and Mucor. 1. Vaucheria: Vaucheria is a multicellular green alga belonging to the class…
Correct answer: Volvox- A. Presence or absence of a well defined nucleus
- B. Mode of reproduction
- C. Mode of nutrition
- D. Complexity of body organisation
Explanation: R.H. Whittaker considered complexity of cell structure and structural (body) organisation, mode of nutrition, ecological life style and…
Correct answer: Mode of reproduction- A. Polio virus
- B. Tobacco mosaic virus
- C. Measles virus
- D. Retrovirus
Explanation: So, in this context, the Tobacco Mosaic Virus fits the description you provided.Tobacco mosaic virus is a RNA virus that causes tobacco…
Correct answer: Tobacco mosaic virus107. Viruses have
- A. DNA enclosed in a protein coat
- B. Prokaryotic nucleus
- C. Single chromosome
- D. Both DNA and RNA.
Explanation: Sure, I can explain each of these options:1. **DNA enclosed in a protein coat**: - This describes the structure of many viruses.
Correct answer: DNA enclosed in a protein coat- A. Cell membrane structure
- B. Mode of nutrition
- C. Cell shape
- D. Mode of reproduction
Explanation: The archaebacteria are the 'ancient' bacteria that include extremophiles like methanogens, halophiles and thermophiles.
Correct answer: Cell membrane structure- A. Fimbriae
- B. Flagella
- C. Cilia
- D. Pili
Explanation: In summary, among the options you mentioned, flagella are the primary structures responsible for the motility of bacteria, while fimbriae…
Correct answer: Flagella- A. Rhodospirillum
- B. Spirogyra
- C. Chlamydomonas
- D. Ulva
Explanation: In Rhodospirillum, the electron donor is an organic compound instead of water hence no oxygen is released, i.e., anoxygenic photosynthesis…
Correct answer: Rhodospirillum- A. Bluegreen algae
- B. Saprophytic fungi
- C. Archaebacteria
- D. Eubacteria
Explanation: Archaebacteria belong to a group of prokaryotic organisms called Monera.
Correct answer: Archaebacteria- A. Pneumatophores
- B. Chromatophores
- C. Heterocysts
- D. Basal bodies
Explanation: Chromatophore is a pigmented lamellar or vesicular structure that can be isolated from disrupted photosynthetic bacteria or cyanobacteria.
Correct answer: Chromatophores- 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.
Explanation: A bacterial capsule is advantageous to a bacterium, particularly in terms of pathogenicity, for the following reasons:1.
Correct answer: Provides pathogenicity to bacteria.- A. They lack a rigid cell wall.
- B. They are heterotrophs.
- C. They lack nuclear membrane.
- D. They are phagotrophs.
Explanation: The true statement for fungi among the options is:"They are heterotrophs."Explanation of each statement:1.
Correct answer: They are heterotrophs.- A. Fungi
- B. Animalia
- C. Monera
- D. Plantae
Explanation: Nutritional diversity refers to the range of nutritional strategies and sources of food organisms within a particular group can utilize.
Correct answer: Fungi- A. Cyanobacteria
- B. Archaebacteria
- C. Chemosynthetic autotrophs
- D. Heterotrophic bacteria
Explanation: 1. **Cyanobacteria:** Cyanobacteria, also known as blue-green algae, are photosynthetic prokaryotes that can be found in various…
Correct answer: Heterotrophic bacteria- A. Paramecium and Plasmodium belong to the same kingdom as that of Penicillium.
- B. Lichen is a composite organism formed from the symbiotic association of an algae and a protozoan.
- C. Yeast used in making bread and beer is a fungus.
- D. Nostoc and Anabaena are examples of protista.
Explanation: Let's examine each statement:1. **Paramecium and Plasmodium belong to the same kingdom as that of Penicillium:** This statement is…
Correct answer: Yeast used in making bread and beer is a fungus.- A. Azotobacter
- B. Aspergillus
- C. Glomus
- D. Trichoderma
Explanation: The microbe that forms a symbiotic association with plants and aids in their nutrition is **Glomus**.
Correct answer: Glomus- A. Protista
- B. Algae
- C. Plantae
- D. Monera
Explanation: In order to develop phylogenetic classification, R.H. Whittaker (1969), an American taxonomist, divided all the organisms into five…
Correct answer: Protista- A. 5S rRNA
- B. snRNA
- C. hnRNA
- D. 23S rRNA
Explanation: Among the options you provided, 23S rRNA also acts as a catalyst in a bacterial cell. Here's an explanation of each option:1.
Correct answer: 23S rRNA