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. Excrete
- B. Reproduce
- C. Decline phase
- D. Stop phase
Explanation: At the decline phase, bacterial growth decreases exponentially and many bacteria begin dying due to lack of nutrients or unfavorable…
Correct answer: Decline phase3102. Archaea live in both extreme and moderate environments those living in extreme condition are called:
- A. Extremophile
- B. Methanogen
- C. Extremophyte
- D. Extremogeus
Explanation: The correct term for organisms that live in extreme environments is extremophile.
Correct answer: Extremophile- A. Alpha proteobacteria
- B. Beta proteobacteria
- C. Gamma proteobacteria
- D. Delta proteobacteria
Explanation: The correct answer is Gamma proteobacteria. This group includes chemolithotrophic sulfur bacteria, which are capable of oxidizing H2S to…
Correct answer: Gamma proteobacteria- A. Cyanobacteria
- B. Phototrophic organisms
- C. Anaerobic organisms
- D. All of the above
Explanation: It is a fact that the first organisms that oxygenated the atmosphere were cyanobacteria
Correct answer: Cyanobacteria3105. Rhizobium belongs to:
- A. Beta-protobacteria
- B. Gama-protobacteria
- C. Alpha-protobacteria
- D. Delta-protobacteria
Explanation: Rhizobium belongs to alpha proto-bacteria, this is a fact and has to be learnt
Correct answer: Alpha-protobacteria- A. Fungi
- B. Bacteria
- C. Algae
- D. Plants
Explanation: Myxospores are actually not spores produced by fungi, but rather by certain groups of bacteria called Myxobacteria.
Correct answer: Bacteria- A. Bacill
- B. Spirilla
- C. Vibrio
- D. Cocci
Explanation: Bacillus is an example of bacteria that can be atrichous, meaning they do not have flagella or hair-like structures for movement.
Correct answer: Bacill- A. Bacteria
- B. Algae
- C. Fungi
- D. Both (A) & (B)
Explanation: The peptidoglycan layer is found in the cell wall of bacteria. It is a unique structural component that provides strength and rigidity to…
Correct answer: Bacteria- A. Amphitrichous
- B. Atrichous
- C. Lophotrichous
- D. Monotrichous
Explanation: A bacterium with a single polar flagellum is classified as Monotrichous.
Correct answer: Monotrichous- A. Diatoms
- B. Dinoflagellates
- C. Water molds
- D. Myxomycota
Explanation: The rapid increase in the population of red dinoflagellate (a type of algae), causes the sea to appear red, which is responsible for the…
Correct answer: Dinoflagellates- A. Merozoites
- B. Sporozoites
- C. Gametocytes
- D. Oocytes
Explanation: The well-matured sporozoites are injected into the human host through the saliva of an Anopheles mosquito when it bites to feed on the…
Correct answer: Sporozoites- A. Ronald
- B. AFA king
- C. Laveran
- D. Aristotle
Explanation: Charles Louis Alphonse Laveran, a French physician, was the one who stated the hypothesis that mosquitoes are involved in the spread of…
Correct answer: Laveran- A. Euglenophyta
- B. Pyrrophyta
- C. Chrysophyta
- D. Both A and B
Explanation: Euglenophyta, commonly known as euglenoids, are a group of unicellular organisms that possess chloroplasts and are capable of…
Correct answer: Both A and B- A. merozoites increase their population in RBC and burst open the RBC
- B. sporozoites enter the bloodstream
- C. sporozoites enter the liver cells.
- D. merozoites come out of the liver cells.
Explanation: During the erythrocytic stage of the plasmodium life cycle, merozoites invade red blood cells and reproduce inside them.
Correct answer: merozoites increase their population in RBC and burst open the RBC- A. Plasmodia are the cause of malaria.
- B. Bad air is involved in the spread of malaria.
- C. Mosquitoes are possible carriers of Plasmodium.
- D. Malaria is caused by bad air coming from marshy places.
Explanation: Ronald Ross's hypothesis and subsequent research demonstrated that mosquitoes, particularly the Anopheles species, are vectors for the…
Correct answer: Mosquitoes are possible carriers of Plasmodium.- A. sporozoa
- B. sarcodina
- C. mastigophora
- D. microspora
Explanation: Entamoeba belongs to the subphylum Sarcodina, which includes protozoans that move and feed using temporary projections of their cell…
Correct answer: sarcodina- A. Cholera, typhoid, and tetanus are well-known diseases caused by viruses.
- B. Dinoflagellates, euglenoids and slime moulds are placed under kingdom Monera
- C. Members of kingdom Protista are primarily aquatic
- D. Dinoflagellates are the chief 'producers' in the oceans
Explanation: The kingdom Protista consists of a diverse group of eukaryotic microorganisms, many of which are found in aquatic environments.
Correct answer: Members of kingdom Protista are primarily aquatic- A. Chitin
- B. Cellulose
- C. Murein
- D. Lignin
Explanation: The cell wall of fungus like protista is composed of chitin.
Correct answer: Chitin- A. Protomycota
- B. Gymnomycota
- C. Oomycota
- D. Deuteromycota
Explanation: Phylum Deuteromycota is a polyphyletic group of asexually-reproducing fungi that do not display a sexual phase; they are known as imperfect.
Correct answer: Deuteromycota- A. Pigs and rats
- B. Pigs and monkeys
- C. Rats and dogs
- D. Cats and sheep
Explanation: Swine are the primary reservoir hosts of Balantidium coli. Humans can also be reservoirs, and other potential animal hosts include…
Correct answer: Pigs and monkeys