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. Sea horse
- B. Sea mouse
- C. Sea cucumber
- D. Sea lion
Explanation: Annelids, Molluscs, and arthropods fall into the category of protostomes.
Correct answer: Sea mouse- A. 4
- B. 6
- C. 8
- D. 10
Explanation: Arachnids(spider-like) is a class of Phylum Arthropoda with 4 pairs of legs, so a total of 8 legs.
Correct answer: 8- A. Disc
- B. Arm
- C. Foot
- D. Siphon
Explanation: The muscular foot has been modified in cephalopods (Octopus) to form the tentacles and the siphon.The siphon is the tubular portion of the…
Correct answer: Siphon- A. Brittle star
- B. Scorpion
- C. Chaetopterus
- D. Unio
Explanation: Brittle Stars are Echinoderms which are marine animals having radial symmetry with five parts, often with spines. So it is a deuterostome.
Correct answer: Brittle star- A. Dogfish
- B. Lamprey
- C. Catfish
- D. Ray fish
Explanation: Maximum number of gill slits present in cyclostomes . Cyclostomes have 6-15 pairs of gills. Lampreys are example of cyclostomes.
Correct answer: Lamprey- A. Planaria
- B. Earthworm
- C. Cockroach
- D. Snail
Explanation: In planaria, the mouth opens into muscular tubular pharynx which leads into the intestine.
Correct answer: Planaria- A. Coral
- B. Sea anemone
- C. Hydra
- D. Jellyfish
Explanation: Corals are unique among coelenterates because they secrete a hard exoskeleton made of calcium carbonate (CaCO3), which is distinct from…
Correct answer: Coral- A. Imprinting
- B. Insight learning
- C. Latent learning
- D. Trial & error learning
Explanation: The complex form of learning that requires the manipulation of mental concepts for developing an adaptive behaviour is called insight…
Correct answer: Insight learning- A. Annelida
- B. Mollusca
- C. Coelenterata
- D. Echinodermata
Explanation: Phylum Coelenterata is a group of aquatic and marine organisms with a radially symmetrical body.
Correct answer: Coelenterata3010. Hermaphrodite phylum is:
- A. Annelida
- B. Arthropoda
- C. Echinodermata
- D. Mollusca
Explanation: A hermaphrodite is an organism with both male and female reproductive organs.
Correct answer: Annelida- A. Bipinnaria
- B. Radiolaria
- C. Tornaria
- D. Trochophore
Explanation: Balanoglossus is a genus of ocean-dwelling acorn worms (Enteropneusta).
Correct answer: Tornaria- A. Mytilus
- B. Chaetopterus
- C. Penguin
- D. Jellyfish
Explanation: Deuterostomes are a group of animals characterized by their embryonic development, where the anus forms before the mouth.
Correct answer: Penguin- A. Protozoa
- B. Parazoa
- C. Metazoa
- D. Aves
Explanation: Porifera, commonly known as sponges, belong to the subkingdom Parazoa within the kingdom Animalia.
Correct answer: Parazoa- A. Pisces
- B. Amphibia
- C. Reptilia
- D. Aves
Explanation: The correct answer is Aves. Female birds generally possess a single ovary on the left side of their body, an adaptation believed to…
Correct answer: Aves3015. Chiroptera are:
- A. Flying mammals
- B. Flesh-eating mammals
- C. Hoofed mammals
- D. Aquatic mammals
Explanation: Chiroptera, commonly known as bats, are the only flying mammals. Their wings are composed of a thin membrane of skin supported by…
Correct answer: Flying mammals- A. Desert-snake
- B. Coelenterate
- C. A big-reptile
- D. Black-forest monkey
Explanation: The Portuguese-man-of-war is a coelenterate, a marine invertebrate belonging to a group that includes jellyfish and sea anemones.
Correct answer: Coelenterate- A. One ventricle, two atria
- B. Two ventricles, one atrium
- C. One ventricle, one atrium
- D. One ventricle, one atrium, one sinus venosus
Explanation: Amphibians typically have a heart with three chambers, which includes one ventricle and two atria.
Correct answer: One ventricle, two atria3018. The study of fishes is:
- A. Ornithology
- B. Ichthyology
- C. Herpetology
- D. Serpetology
Explanation: The correct answer is Ichthyology, which is the scientific study of fishes, including their biology, classification, and conservation.
Correct answer: Ichthyology- A. Bipinnaria larva
- B. Trochophore larva
- C. Glochidium larva
- D. Instar larva
Explanation: Tornaria larva resembles with Bipinnaria larva. Because Tornaria larva of hemichordates and Bipinnaria of Echinodermata are very similar…
Correct answer: Bipinnaria larva- A. Myxine (Hagfish)
- B. Skates
- C. Sharks
- D. Teleost (Bony Fishes)
Explanation: Marine teleosts are hypoosmotic to seawater, so they face osmotic loss of water and diffusional gain of NaCl across the gill.
Correct answer: Teleost (Bony Fishes)