Free Biodiversity and Variety of Life MCQs with Answers

• A. Four pair of legs
• B. Six jointed legs
• C. Thorax is not present
• D. Abdomen is attached to head

Explanation: B is correct. They have 3 pairs of jointed legs.

• A. Musclee tissues.
• B. Hydrostatic skeleton
• C. Parapodia
• D. Bones

Explanation: The locomotory organs in annelids include parapodia, suckers, and setae.

• A. They have feathers instead of hairs
• B. They are warm blooded
• C. They lay hard shell eggs
• D. They have syrinx as voice organ

Explanation: The explanation for this question will be added soon!

• A. Shark
• B. Dipnoi
• C. Rays
• D. None

Explanation: The vertebrates already considered are adapted to strict aquatic life. The group of ancient ish known as dipnoi showed modiication of…

• A. Possession of body cavity
• B. Number of germinal layers
• C. Nervous system
• D. Body symmetry

Explanation: The main difference between Hemichordata and Chordata lies in the presence of a notochord.

• A. Unicellular
• B. Triploblastic
• C. Both a and b
• D. Diploblastic

Explanation: Kingdom animalia includes all those organisms that are multicellular. Grade radiata includes diploblastic animals while grade bilateria…

• A. Crustaceans
• B. Arachnida
• C. Myriapods
• D. Gastropods

Explanation: Based on the explanations provided, the correct answer to the question is option A) Crustaceans.

• A. Tissue level of organization
• B. Coelenteron
• C. Nematoblasts
• D. All of these

Explanation: All the mentioned characters are exhibited by cnidarians.

• A. Crocodiles and mammals
• B. Birds and mammals
• C. Mammals only
• D. All of the above

Explanation: Based on the explanations provided, the correct answer to the question is option C) Mammals only.

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

Explanation: Based on the explanations provided, the correct answer to the question is option B) Schizocoelous.

• A. Gastropods
• B. Bivalves
• C. Cephalopods
• D. None of the above

Explanation: Clams, mussels, oysters, and scallops, mytilus and anodonta are members to the class Bivalvia (or Pelecypodia).

• A. Porifera
• B. Ctenophora
• C. Echinoderm
• D. None of the above

Explanation: Based on the explanations provided, the correct answer to the question is option A) Porifera. Euplectella belongs to the phylum Porifera.

• A. Triploblastic
• B. Bilateral Symmetry
• C. Coelomate
• D. Flatworms

Explanation: Based on the explanations provided, the correct answer to the question is option C) Coelomate. Platyhelminthes are not coelomates.

• A. Starfish
• B. Cuttlefish
• C. Catfish
• D. Butterfly

Explanation: Based on the explanations provided, the correct answer to the question is option C) Catfish.

• A. Pinacocytes
• B. Choanoderm
• C. Pinacoderm
• D. Choanocytes

Explanation: The inner layer of sponges is made up of choanocytes that are flagellated cells, this layer is called the choanoderm.

• A. Protozoa
• B. Radiata
• C. Parazoa
• D. Coelomates

Explanation: Parazoa is a group of animals that lack true tissue organization and symmetry. This group includes organisms like sponges.

• A. Hepatic caeca
• B. Rectum
• C. Stomach
• D. Gizzard

Explanation: The midgut in cockroaches is a short narrow tube called the "hepatic caeca." This structure is responsible for the secretion of digestive…

• A. They are protosomes
• B. All chordates are vertebrates
• C. They lack a coelom
• D. Their anus is formed from the blastopore

Explanation: Chordates, as deuterostomes, exhibit indeterminate cleavage and radial symmetry during their early embryonic development.

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

Explanation: Centipedes belong to the class Myriapoda within the phylum Arthropoda. This class includes centipedes and millipedes.

• A. Cockroach
• B. Butterfly
• C. Stingray
• D. Earthworm

Explanation: Stingrays are cartilaginous fish and belong to the phylum Chordata. Chordates are deuterostomes, which means they have a mouth that…