Free Kingdom Animalia MCQs with Answers

• A. Stipules
• B. Brails
• C. Spines
• D. Spicules

Explanation: Spicules are the structural components of a sponge, or the "bricks," and the shapes, sizes, and composition are unique for each species.

• A. Euplectella
• B. Spongilla
• C. Leucosolenia
• D. Scolymastra joubini

Explanation: d) Scolymastra joubini, Scolymastra joubini, also known as "giant Antarctic sponge," is a species of sponge found in the waters around…

• A. Chondrichthyes
• B. Osteichthyes
• C. Cyclostomata
• D. Both Options A and B are correct

Explanation: Due to their circular mouth, they are named Cyclostomata. They are parasitic, usually feeding on fish in their adult stage.

• A. To increase the size of the animals
• B. To help in the functioning of the reproductive system
• C. To provide space for the development of organs and systems
• D. None of these

Explanation: The coelom provides a space where internal organs can develop and function.

• A. Leaf green tree frog
• B. Japanese giant salamander
• C. Crow
• D. Both A and B

Explanation: Leaf green tree frog is Amphibian therefore its not an amniote .

• A. Triploblastic
• B. Diploblastic
• C. Radioblast
• D. All of these options are correct

Explanation: Grade Radiata includes animals with radial symmetry, such as coelenterates, which are diploblastic.

• A. Spicules
• B. Choanocytes
• C. Gemmules
• D. Both options A and B are correct

Explanation: OPTION A: All sponges except class mykospongida have skeletons. The skeleton consists of carbonate of lime or silicon in the form of…

• A. Sterilization
• B. Disinfection
• C. Disinfestation
• D. None of these

Explanation: Disinfestation is the process of removing parasites from the bodies of the living hosts. Hence this is the correct option.

• A. Neurons are differentiated into sensory, motor, and associative neurons
• B. Nerves are present
• C. No specialized sensory organs are present
• D. All of the above options are correct

Explanation: OPTION A: In Planaria, there is a differentiation of neurons into sensory associative and motor neurons.

• A. Excretory system
• B. Digestive system
• C. Circulatory system
• D. Nervous system

Explanation: The system that is not segmentally arranged in annelids is the circulatory system (option c).

• A. A shark's heart has only one chamber whereas a whale's heart has two chambers
• B. Shark gills are not covered by operculum whereas those in a whale are
• C. Sharks do not possess a swim bladder whereas whales do
• D. Sharks have placoid scales on their skin whereas whales don't

Explanation: OPTION A: The heart of a shark has two chambers: an atrium (also known as the auricle) and a ventricle.

• A. Excretory
• B. Nervous
• C. Transport
• D. Both options A and B are correct

Explanation: Acoelomates have complex nervous systems and excretory systems.

• A. Annelida
• B. Cnidaria
• C. Porifera
• D. Protozoa

Explanation: Animals included in phylum Porifera are Parazoans because they do not show the formation of true tissues (except in class Hexactinellida).

• A. Cell wall
• B. Prostomium
• C. Nucleolus
• D. Parapodia

Explanation: The correct answer is d) Parapodia. Parapodia are fleshy, paddle-like structures that extend from the sides of the body segments in many…

• A. They may be coelomate pseudocoelomate or acoelomate
• B. They are included in grade bilateria
• C. All of them have digestive systems
• D. All of them have blood vessels

Explanation: Triploblasts have three germ layers: the outer (ectoderm), inner (endoderm), and middle (mesoderm).

• A. Haemoglobin
• B. Hemerythrin
• C. Haemocyanin
• D. Both Options B and C are correct

Explanation: Spider's blood is blue due to the presence of hemocyanin. Haemocyanin, instead of having an atom of iron in its middle, has an atom of…

• A. They are protostomes
• B. All chordates are vertebrates
• C. They lack a coelom
• D. Their anus forms from the blastopore

Explanation: Chordates are deustromes so the answer cannot be Option A. All vertebrates are chordates but not all chordates are vertebrates so the…

• A. Hydra
• B. Crabs
• C. Squid
• D. Earthworm

Explanation: Diploblastic organisms have two germ layers, for example, Cridaria. Hydra belongs to the phylum Cridaria and class Hydrozoa.

• A. Ectoderm
• B. Mesoderm
• C. Endoderm
• D. All of these

Explanation: The pseudocoelom in animals is derived from the blastocoel, which is the primary body cavity formed during embryonic development.

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

Explanation: Option D is correct since in Schizocoelus organisms, coelom develops by splitting of the mesodermal embryonic tissue.