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. Marsupials
- B. Eutherians
- C. Monotremes
- D. Metatherians
Explanation: The monotremes are a group of highly specialised egg-laying predatory mammals, containing the platypus.
Correct answer: Monotremes- A. Coelenterate
- B. Potychaeta
- C. Echinodermata
- D. Cestoda
Explanation: Bipinnaria larva is the larva of class Asteroidea of phylum Echinodermata.
Correct answer: Echinodermata- A. Hydra
- B. Velella
- C. Obelia
- D. Physalis
Explanation: The correct option is Physalis. The Portuguese man o' war is not a single organism but a colonial organism known as Physalia physalis…
Correct answer: Physalis- A. Coelenterates
- B. Nematodes
- C. Annelids
- D. None of them
Explanation: Pseudocoelomates do not have a true coelom (i.e. a cavity that is present between the gut and body wall, and is lined by the mesoderm on…
Correct answer: Nematodes- A. Lagomorpha
- B. Primates
- C. Ederitate
- D. None of these
Explanation: Opposable thumbs allow the digits to grasp and handle objects and are characteristic of primates.
Correct answer: Primates- A. Platyhelminthes
- B. Annelida
- C. Coelenterate
- D. All of above
Explanation: A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including Platyhelminthes.
Correct answer: Platyhelminthes- A. Pisces
- B. Mammals
- C. Insects
- D. Mollusca
- E. None of them
Explanation: Seahorses belong to the phylum Pisces. They are tiny fishes named for shape of their head, which looks like the head of a horse.
Correct answer: Pisces- A. Corals
- B. Foraminiferans
- C. Molluscs
- D. None of these
Explanation: The mollusc (or mollusk) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts.
Correct answer: Molluscs- A. Eagle
- B. Kestrel
- C. Archaeopteryx
- D. Mallard
Explanation: Unlike a modern bird, Archaeopteryx had toothed jaws, claws on its wings, and a long, bony tail. Use the image below to help retain:
Correct answer: Archaeopteryx1110. Scales are present in:
- A. Fishes
- B. Reptiles
- C. Birds
- D. Amphibians
- E. A and B
Explanation: The skin of most fishes is covered with scales. Placoid scales in sharks and rays, cosmoid scales in lungfishes and some fossil fishes…
Correct answer: A and B- A. Metatheria
- B. Prototheria
- C. Eutheria
- D. None of the Above
Explanation: The key difference between Prototheria, Metatheria and Eutheria is that Prototheria refers to egg-laying mammals, while Metatheria refers…
Correct answer: Eutheria- A. Urochordata
- B. Cephalochordata
- C. Vertebrata
- D. Mollusca
Explanation: Lampreys and Sea Squirts are some examples of Cephalochordata.
Correct answer: Cephalochordata- A. Placoid scales
- B. Ganoid scales
- C. Ctenoid scales
- D. Cycloid scales
Explanation: The placoid scales of cartilaginous fishes are also called dermal denticles.
Correct answer: Placoid scales- A. Sponges
- B. Platyhelminthes
- C. Annelids
- D. Echinoderms
Explanation: Sponges can repair their body parts, even if a large part is lost. Sponges can regenerate the entire organism from the conglomeration of…
Correct answer: Sponges- A. Porifera
- B. Annelida
- C. Platyhelminthes
- D. Cnidaria
Explanation: In Platyhelminthes, protonephridia are present. Protonephridia likely first arose as a way to cope with a hypotonic environment by…
Correct answer: Platyhelminthes1116. Pinacocytes forms _.
- A. Pores
- B. Ostia
- C. Epidermis
- D. Spongocoel
Explanation: Options A: Pores are small openings in the epidermis that allow water to enter the sponge.
Correct answer: Epidermis- A. Sea Anemone
- B. Corals
- C. Obelia
- D. Jellyfish
- E. Frog
Explanation: Option A: The biological name of sea anemone is Actinia. They are a type of cnidarian, which are animals that have stinging cells.
Correct answer: Sea Anemone- A. Eumetazoa
- B. Bilateria
- C. Protozoa
- D. Parazoa
- E. Protostomia
Explanation: Option A: Eumetazoa is a broad grouping of animals that have true tissues and organs. It includes all animals except sponges.
Correct answer: Parazoa- A. Cartilage
- B. Cuticle
- C. Chitin
- D. Amino acids
Explanation: The exoskeleton of a cockroach is made up of chitin. The skeleton of a cockroach is covered by thick hard chitinous cuticles secreted by…
Correct answer: Chitin- A. Nematoda-Ascaris and Hookworm
- B. Annelid-Nereis and Leech
- C. Echinodermata-Sea star and Brittle star
- D. Platyhelminthes-Planaria and Liver fluke
- E. Cnidaria-Euplectella and Bath sponge
Explanation: Euplectell and bath sponge belong to the Phylum Porifera. Examples of phylum cnidaria include Hydra, Jellyfish, and Obelia.
Correct answer: Cnidaria-Euplectella and Bath sponge