Free Biodiversity and Variety of Life MCQs with Answers

• A. Jelly Fish
• B. Sea Anemone
• C. Tapeworm
• D. Corals

Explanation: Tapeworms are triploblastic organisms. They belong to the phylum Platyhelminthes and have three germ layers: ectoderm, mesoderm and…

• A. Dugesia
• B. Fasciola
• C. Taenia
• D. Coral

Explanation: With few exceptions, the Platyhelminthes are parasites, mostly endoparasites, i.e., live inside their hosts.

• A. Cnidaria
• B. Annelida
• C. Aschelminthes
• D. Platyhelminthes

Explanation: With few exceptions the Platyhelminthes are parasites, mostly endoparasites, i.e., live inside their hosts.

• A. Cenozoic
• B. Devonian
• C. Proterozoic
• D. Mesozoic

Explanation: Reptiles flourished throughout the Mesozoic era (225-65 million years ago).

• A. Stingray
• B. Liver fluke (Fasciola)
• C. Aurelia
• D. Schistosoma

Explanation: The liver fluke (Fasciola hepatica) is an endoparasite of humans, cattle, and sheep.

• A. Crustacea
• B. Insecta
• C. Myriapoda
• D. Arachnida

Explanation: Respiration in class arachnida is by gills or special structures called book lungs.

• A. Annelids
• B. Aschelminthes
• C. Molluscs
• D. Platyhelminthes

Explanation: The Platyhelminthes are acoelomate flatworms: their bodies are solid between the outer surface and the cavity of the digestive system

• A. Flying fish
• B. Salmon
• C. Sea horse
• D. All of the above

Explanation: Salmon, flying fish, and sea horse (Hippocampus) are all fishes and come under Pisces.

• A. Corals
• B. Sponges
• C. Hydras
• D. Anemones

Explanation: Factual recall. Sponges have numerous pores called ostia and hence are known as porifera.

• A. Medusoids
• B. Annelida
• C. Aschelminthes
• D. Mollusca
• E. Arthropoda

Explanation: Mollusca is a phylum that includes organisms like snails, clams, squids, and octopuses.

• A. Porifera
• B. Coelenterates
• C. Mollusca
• D. Amphibians
• E. Polychaetes

Explanation: Coelenterates, also known as Cnidarians, are radially symmetrical organisms that possess specialized stinging cells called nematocysts.

• A. An archenteron
• B. A coelom
• C. A pseudocoelom
• D. A gastrovascular cavity
• E. A pharynx

Explanation: The coelom provides cushion as well as allowing for expansion and contraction of internal organs (such as the lungs and stomach).

• A. Pseudocoelom
• B. Bilateral symmetry
• C. Mesoderm germ layer
• D. Ectoderm germ layer
• E. Notochord

Explanation: Only members of the phylum Chordata have notochords. Roundworms are in the phylum Nematoda.

• A. The appearance of pharyngeal gill slits
• B. The presence of three germ layers
• C. The presence of vertebrae
• D. A true coelom
• E. The embryonic appearance of an archenteron

Explanation: Pharyngeal gill slits appear only in chordates. All eumetazoa possess three germ layers and develop an archenteron.

• A. Early cleavages of the zygote
• B. The ultimate function of the opening to the Archenteron
• C. Number of germ layers in the developing embryo
• D. Embryonic origin of the mouth
• E. Embryonic origin of the coelom

Explanation: Both deuterostomes and protostomes have three germ layers.

• A. Mollusca
• B. Annelida
• C. Echinodermata
• D. Arthropoda
• E. Chordate

Explanation: Annelida: This phylum includes segmented animals like; earthworms, leech, etc Their body is soft and bilaterally symmetrical Their body is…

• A. Two
• B. Three
• C. Four
• D. Five

Explanation: From an evolutionary perspective, amphibians are between fishes and reptiles i.e.

• A. Water
• B. Water and land
• C. Land
• D. Air

Explanation: Amphibians have gills as well as lungs which make it possible for them to live on both water and land.

• A. Prototheria
• B. Protozoa
• C. Chordata
• D. Monotremes
• E. Both A and D

Explanation: Monotremes lay eggs and prototheria are both egg-laying mammals so the question has two correct answers.

• A. Larynx
• B. Pharynx
• C. Syrinx
• D. Both A and C

Explanation: Organs of voice production in birds are called syrinx.