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. Coelom lined by mesoderm
- B. Mouth and anus as two body openings
- C. A mesodermal layer that forms muscles
- D. A gastrovascular cavity with one opening only
Explanation: Diploblastic animals, like cnidarians, have two primary germ layers: ectoderm and endoderm.
Correct answer: A gastrovascular cavity with one opening only- A. Lack parapodia and setae
- B. Lack parapodia and have few setae per segment
- C. Bear a pair of parapodia with many setae in each segment
- D. Bear two pairs of parapodia with few setae in each segment
Explanation: Polychaetes, also known as bristle worms, are a class of annelid worms known for their distinct anatomical feature, each body segment…
Correct answer: Bear a pair of parapodia with many setae in each segment- A. Porocytes
- B. Pinacocytes
- C. Choanocytes
- D. Amoebocytes
Explanation: The correct answer is amoebocytes. Amoebocytes are crucial in sponges for producing skeletal structures, as they secrete the materials…
Correct answer: Amoebocytes- A. Kidneys
- B. Protonephridia
- C. Metanephridia
- D. Protostomium
Explanation: Earthworms excrete waste through a system of structures called metanephridia.
Correct answer: Metanephridia- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The correct order is polyp, medusa, egg, planula larva, polyp because the polyp produces medusae, the medusa releases eggs, the eggs…
Correct answer: Option A- A. Annelida
- B. Mollusca
- C. Nematoda
- D. Arthropoda
Explanation: The correct answer is Annelida. Animals in this phylum, such as earthworms, possess a closed circulatory system where blood circulates…
Correct answer: Annelida- A. frog
- B. lizard
- C. kiwi
- D. kangaroo
Explanation: The presence of shelled eggs, dry skin, and internal fertilization are evolutionary adaptations primarily observed in amniotes, a group of…
Correct answer: lizard- A. heterocercal tail
- B. 5-7 pairs of gills
- C. cartilaginous endoskeleton
- D. operculum over gills
Explanation: Chondrichthyes do not possess an operculum over their gills like bony fish (Osteichthyes) do.
Correct answer: operculum over gills1469. Some animals like fiddler crab, busiest during the time of either dawn or dusk or both are called
- A. Diurnal animals
- B. Nocturnal animals
- C. Crepuscular animals
- D. Circadian animals
Explanation: In zoology, a crepuscular animal is one that is active primarily during the twilight period, being matutinal, vespertine/vespertinal, or…
Correct answer: Crepuscular animals- A. Learning
- B. Innate
- C. Imprinting
- D. Altruism
Explanation: Innate behaviors are instinctual and are present in animals from birth.
Correct answer: Innate- A. Lack cellulose in their cell wall
- B. Heterotrophs
- C. Contains chitin
- D. Non Motile
Explanation: A. animal like property, both lack cellulose. B. Do not synthesize their own food they are heterotrophs C. Like arthropods
Correct answer: Non Motile- A. Mycelium
- B. Hyphae
- C. Septate hyphae
- D. Coenocytic
Explanation: B. Thread like filaments C. Divided by cross walls called septa D. septate hyphae with elongated multinucleates large cell
Correct answer: Mycelium- A. Absorptive heterotrophs
- B. Saprotrophs
- C. Decomposers
- D. Autotrophs
Explanation: A. Direct absorption from environment B. feeding on dead organic matter. C. feeding on dead organisms and matter.
Correct answer: Autotrophs- A. Saprobic fungi and bacteria
- B. Plants
- C. Animals
- D. Algae
Explanation: B. AutotrophsC. HeterotrophsD. Photosynthetic protists
Correct answer: Saprobic fungi and bacteria- A. Rhizoids
- B. Constricting ring
- C. Haustoria
- D. Hyphae
Explanation: A. thin filamentous modified hyphae B. used to capture nematodes D. Thread like filaments
Correct answer: Haustoria- A. Pleurotus ostreatus
- B. Mildews
- C. Armillaria
- D. Yeast
Explanation: B. Obligate parasiteC. Parasitic fungusD. Non hyphal unicellular fungi
Correct answer: Pleurotus ostreatus- A. Mycorrhizae
- B. Lichens
- C. Endomycorrhizae
- D. Ectomycorrhizae
Explanation: A. Association between fungi and roots of plantsC. Fungal hyphae penetrate the outer cells of plant rootD.
Correct answer: Lichens- A. Tolerate wide range of pH
- B. Tolerate temperature
- C. Tolerate high osmotic pressure
- D. All of the above
Explanation: A. 2-9 B. Wide range upto 70 degrees C. can survive in conc. salt/sugar solutions E.g jam, jelly
Correct answer: All of the above- A. Spores
- B. Conidia
- C. Binary fission
- D. Budding
Explanation: Correct Option: C Binary fission is a method of Asexual reproduction in bacteria, not Fungi. A. Produced in sporangia B.
Correct answer: Binary fission- A. Zygomycota
- B. Ascomycota
- C. Basidiomycota
- D. Deuteromycota
Explanation: A. Sexual reproduction by ZygosporesB. Sexual reproduction by AscosporesC. Sexual reproduction by Basidiospores
Correct answer: Deuteromycota