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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2861. Dysentery is caused by:
- A. E. coli
- B. Salmonella
- C. Entamoeba histolytica
- D. Bacteroides fragilis
- E. Listeria monocytogenes
Explanation: This protozoan parasite is the correct answer. It is known to cause amoebic dysentery, a severe intestinal infection leading to diarrhea…
Correct answer: Entamoeba histolytica- A. Headache
- B. Muscular pains
- C. Constipation
- D. Chills
Explanation: Constipation is not typically associated with malaria. Malaria symptoms mainly include fever, chills, headache, and muscle pain.
Correct answer: Constipation- A. Bacterium
- B. Virus
- C. Fungus
- D. Alga
Explanation: Chlorella is a genus of freshwater green algae. It is a photosynthetic microorganism and belongs to the group of algae, specifically green…
Correct answer: Alga- A. They move by forming specialized cytoplasmic projections called pseudopodia
- B. They have rigid cell wall
- C. They are multicellular organisms
- D. They are autotrophic
Explanation: Amoeba is a unicellular, heterotrophic organism without a rigid cell wall. It moves and captures food by extending pseudopodia (false feet).
Correct answer: They move by forming specialized cytoplasmic projections called pseudopodia- A. It ingests bacteria, yeasts, spores and decaying organic matter
- B. Form resistant haploid spores
- C. Undergoes meiosis
- D. Their zygote produces a single nucleated plasmodium
Explanation: Slime molds form diploid spores, not resistant haploid ones.
Correct answer: Their zygote produces a single nucleated plasmodium2866. Viruses are:
- A. Always viewed with a light microscope
- B. An enzyme-nucleus mixture
- C. Obligate, intracellular parasites
- D. Cellular
- E. Host independent
Explanation: Viruses are obligate, intracellular parasites, which means they require a host cell to reproduce and carry out their life cycle.
Correct answer: Obligate, intracellular parasites- A. Protista
- B. Monera
- C. Metazoa
- D. Animalia
- E. Bryophyta
Explanation: Kingdom Protista has membrane-bound organelles, as shown in the diagram and a true nucleus. That is why option A is correct
Correct answer: Protista- A. Algae increase the level of dissolved oxygen in the immediate environment
- B. Algin is obtained from red algae and carrageenan from brown algae
- C. Agar-agar is obtained from Gelidium and Gracilaria
- D. Laminaria and Sargassum are used as food
Explanation: (b) : Alginic acid is obtained from brown algae whereas carrageenan is obtained from red algae.
Correct answer: Algin is obtained from red algae and carrageenan from brown algae- A. Chlorella and Spirulina are used as space food
- B. Mannitol is stored food in red algae
- C. Algin and carrageenan are products of algae
- D. Agaragar is obtained from Gelidium and Gracilaria
Explanation: (b) : Laminarin and mannitol are food reserves of brown algae or Phaeophyceae.
Correct answer: Mannitol is stored food in red algae- A. They move by forming specialized cytoplasmic projections called pseudopodia
- B. They have a rigid cell wall
- C. They are multicellular organisms
- D. They are autotrophic
Explanation: This is the correct answer. Amoebas are single-celled organisms that move by extending and retracting temporary, finger-like projections…
Correct answer: They move by forming specialized cytoplasmic projections called pseudopodia2871. Algae are:
- A. Unicellular organisms only
- B. Filamentous organisms only
- C. Huge multicellular organisms only
- D. Simple Acellular organisms
- E. Ranges from unicellular to Filaments to huge multicellular organisms
Explanation: Algae can be unicellular (existing as individual cells), colonial (several to many cells living in a colony), filamentous (several to many…
Correct answer: Ranges from unicellular to Filaments to huge multicellular organisms- A. Amoeba
- B. Radiolarians
- C. Forams
- D. Female Anopheles mosquito
Explanation: The female Anopheles mosquito is the correct answer because it acts as the vector for Plasmodium, the parasite that causes malaria.
Correct answer: Female Anopheles mosquito- A. Uninucleated
- B. Enucleate
- C. Mononucleated
- D. Multinucleated
Explanation: The plasmodium of slime molds is an amoeboid mass of cytoplasm that is multinucleated, meaning it contains many nuclei within a single…
Correct answer: Multinucleated- A. Exhibit solely animal-like characteristics
- B. Exhibit solely plant-like characteristics
- C. Exhibit both animal and plant-like characteristics
- D. Exhibit characteristics typical of bacteria
- E. Exhibit characteristics typical of viruses
Explanation: Euglena is a protist that uniquely combines traits of both plants and animals.
Correct answer: Exhibit both animal and plant-like characteristics- A. Animal-like Protist
- B. Bacteria-like Protist
- C. Plant-like Protist
- D. Virus-like Protist
- E. Fungi-like Protist
Explanation: Slime molds are classified as fungi-like protists because they share some characteristics with fungi, such as the production of spores and…
Correct answer: Fungi-like Protist2876. Sporozoans have:
- A. Both locomotory organelles and contractile vacuoles
- B. Locomotory organelles but not contractile vacuoles
- C. Contractile vacuoles but not locomotory organelles
- D. Neither locomotory organelle nor contractile vacuoles
- E. All are incorrect
Explanation: Sporozoans are a group of protists that are adapted to a parasitic lifestyle.
Correct answer: Neither locomotory organelle nor contractile vacuoles- A. Erythrocytic phase ⟶ Pre-erythrocytic phase ⟶ Gamogony ⟶ Post-erythrocytic phase
- B. Erythrocytic phase ⟶ Gamogony ⟶ Pre-erythrocytic phase ⟶ Post-erythrocytic phase
- C. Pre-erythrocytic phase ⟶ Post-erythrocytic phase ⟶ Gamogony ⟶ Erythrocytic phase
- D. Post-erythrocytic phase ⟶ Pre-erythrocytic phase ⟶ Erythrocytic phase ⟶ Gamogony
- E. Pre-erythrocytic phase ⟶ Erythrocytic phase ⟶ Post-erythrocytic phase ⟶ Gamogony
Explanation: The Plasmodium life cycle in humans starts with the pre-erythrocytic phase, where sporozoites infect liver cells and multiply.
Correct answer: Pre-erythrocytic phase ⟶ Erythrocytic phase ⟶ Post-erythrocytic phase ⟶ Gamogony- A. 6 - 8 sperm-like microgametes
- B. 6 - 8 sperm-like macrogametes
- C. 8 - 12 sperm-like microgametes
- D. 5 - 7 sperm-like macrogametes
- E. 12 - 15 sperm-like microgametes
Explanation: During the gametogony stage of the sexual cycle in certain protists, male gametocytes produce several flagellated microgametes, which are…
Correct answer: 6 - 8 sperm-like microgametes2879. Concerning conditions necessary for the production of water molds, which statement is correct?
- A. 50% relative humidity is essential for sporangia production
- B. Sporangia cannot be produced if relative humidity exceeds 70%
- C. Sporangia are typically produced in a fully saturated atmosphere at temperatures between 25°C - 37°C
- D. The optimum temperature for producing sporangia is around 21°C
- E. Sporangia never form in their preferred environmental conditions
Explanation: The correct answer is Option D: 'The optimum temperature for the production of sporangia is 21°C'.
Correct answer: The optimum temperature for producing sporangia is around 21°C- A. Flagellata
- B. Sarcodina
- C. Sporozoa
- D. Ciliata
- E. Suctoria
Explanation: The correct answer is Ciliata. Balantidium and Opalina are ciliated protozoans, meaning they use cilia for movement and feeding, which is…
Correct answer: Ciliata