Free Biodiversity and Variety of Life MCQs with Answers

• A. Each body segment has two sets of male and female reproductive organs
• B. The digestive tract develops from endodermal cells in the embryo
• C. The body can be cut into two parts, which are mirror images of each other, in one plane only
• D. None of the above

Explanation: B is correct option because Tapeworms absorb food through their skin. The beef tapeworm is called Taenia saginata.

• A. Pseudocoelom
• B. Enterocoelous
• C. Amphicoelous
• D. Schizocoelous

Explanation: Option D is correct since mesoderm splits in protostomes (annelid, arthropod, and mollusk) which are also called schizocoelous.

• A. Cnidocytes
• B. Gastrozoids
• C. Hydrozoa
• D. Mesoglea

Explanation: Option A is correct since Cnidocytes are the stinging cells that have nematocysts in them and poke them out on being stimulated.

• A. Stipules
• B. Spicules
• C. Spines
• D. Amoeboid cells

Explanation: Option D is correct since amoeboid cells allow sexual reproduction to occur.Option A is incorrect since stipules are not found in…

• A. Muscles and Bones
• B. Hydrostatic skeleton and intestinal fluid
• C. Parapodia and Setea
• D. None of the above.

Explanation: Annelid setae are stiff bristles present on the body. They help, for example, earthworms to attach to the surface and prevent backsliding…

• A. Detrital organic particles
• B. Zooplankton and Small animals
• C. Phytoplanktons
• D. All of these

Explanation: According to research, up to 80% of the food of sponges consists of detrital organic particles, which are tiny pieces of dead or decaying…

• A. Muscles
• B. Hydrostatic skeleton
• C. Parapodia
• D. Setae

Explanation: All annelids except leeches also have chitonous hair-like structures, called setae, projecting from their cuticle.

• A. They have a vertebral column
• B. Their brain is enclosed by the skull
• C. The embryos have gills
• D. The body develops from 3 germinal layers

Explanation: The vertebrates have a vertebral column, something like the notochord. Vertebrates show all the characteristic features of the phylum…

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

Explanation: Correct option:D (It is a fact that Centipedes belong to the class Myriapoda of arthropoda). Centipedes belong to the class Myriapoda.

• A. Arthropods
• B. Fish
• C. Annelids
• D. Nematods

Explanation: Annelids have a hydrostatic skeleton in their body structure.

• A. Tendons and joint capsules
• B. Thorax
• C. Antennae
• D. Abdomen

Explanation: Stretch receptors are mechanoreceptors responsive to the distention of various organs and muscles and are neurologically linked to the…

• A. Glochidium larva
• B. Bipinnaria larva
• C. Trochophore larva
• D. Tomaria larva

Explanation: Trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of…

• A. Bilaterally symmetrical and diploblastic
• B. Bilaterally symmetrical and triploblastic
• C. Radially symmetrical and triploblastic
• D. Radially symmetrical and diploblastic

Explanation: Phylum Platyhelminthes belongs to the kingdom Animalia. This phylum includes 13,000 species. The organisms are also known as flatworms.

• A. Early cleavages of the zygote
• B. 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. The statement that is NOT true among the given options is: "number of germ…

• A. Roundworms
• B. Flatworms
• C. Hookworms
• D. Threadworms
• E. Pinworms

Explanation: The phylum Platyhelminthes consists of flatworms, which are named for their flat, dorsoventrally flattened bodies.

• A. Fishes
• B. Reptiles
• C. Birds
• D. Amphibians
• E. A B and C

Explanation: The skin of most fishes is covered with scales. Placoid scales in sharks and rays, cosmoid scales in lungfishes and some fossil fishes…

• A. Pisces
• B. Aves
• C. Reptiles
• D. Amphibians

Explanation: Amphibia is a class of vertebrates that includes frogs, toads, newts, and salamanders.

• A. They have a vertebral column
• B. The brain is enclosed by the skull
• C. The embryos have gills
• D. All of these

Explanation: Vertebrates belong to phylum Chordata primarily because they exhibit several defining features, including a vertebral column (backbone), a…

• A. Nematodes
• B. Arthropods
• C. Molluscs
• D. None of these

Explanation: Arthropods are believed to have a common origin with annelids. Arthropods, which include insects, spiders, crustaceans, and other…

• A. Head
• B. Dorsal muscular foot
• C. Dorsal visceral body
• D. Both A and B

Explanation: The correct option is C. The mantle in molluscs is a significant anatomical feature that forms a protective layer over the dorsal visceral…