Online Test — Animal Kingdom
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
Sponges show which level of body organisation?
Organ-system
Organ
Tissue
Cellular
Explanation: Sponges (Porifera) have the cellular level of organisation.
Question 2 of 15
An animal divisible into equal halves by any plane through the central axis has ___ symmetry.
Bilateral
Radial
No
Asymmetrical
Explanation: Radial symmetry allows any central plane to make equal halves.
Question 3 of 15
Animals with three germ layers are called:
Diploblastic
Triploblastic
Acoelomate
Asymmetrical
Explanation: Triploblastic animals have three germ layers, including a mesoderm.
Question 4 of 15
A true body cavity lined by mesoderm is a:
Notochord
Coelom
Segment
Gill slit
Explanation: The coelom is a true mesoderm-lined body cavity.
Question 5 of 15
Stinging cells (cnidoblasts) are found in phylum:
Porifera
Cnidaria
Annelida
Mollusca
Explanation: Cnidarians have stinging cnidoblasts, e.g. Hydra.
Question 6 of 15
Flatworms (Platyhelminthes) are:
Coelomate
Pseudocoelomate
Acoelomate
Radially symmetrical
Explanation: Flatworms are acoelomate (no body cavity).
Question 7 of 15
Ascaris (roundworm) belongs to which phylum?
Platyhelminthes
Aschelminthes
Annelida
Arthropoda
Explanation: Roundworms like Ascaris are Aschelminthes (pseudocoelomate).
Question 8 of 15
The first segmented, truly coelomate animals belong to:
Annelida
Porifera
Cnidaria
Echinodermata
Explanation: Annelids (earthworm) are the first segmented true coelomates.
Question 9 of 15
The largest phylum, with jointed appendages and a chitin exoskeleton, is:
Mollusca
Arthropoda
Chordata
Annelida
Explanation: Arthropoda is the largest phylum.
Question 10 of 15
Starfish and sea urchins, with spiny skin and a water-vascular system, are:
Molluscs
Echinoderms
Annelids
Sponges
Explanation: Echinodermata have spiny skin and a water-vascular system.
Question 11 of 15
Which is one of the three defining features of chordates?
Chitin exoskeleton
Notochord
Stinging cells
Eight legs
Explanation: A notochord is one of the three chordate features.
Question 12 of 15
In vertebrates, the notochord is replaced by a:
Backbone (vertebral column)
Shell
Exoskeleton
Gill slit
Explanation: Vertebrates have a vertebral column in place of the notochord.
Question 13 of 15
Animals that breathe through gills, have fins and scales, and are cold-blooded belong to class:
Amphibia
Pisces
Reptilia
Aves
Explanation: Fishes (Pisces) have gills, fins and scales and are cold-blooded.
Question 14 of 15
Birds (Aves) are characterised by feathers and:
Mammary glands
Wings (modified forelimbs)
Moist skin
Gills throughout life
Explanation: Birds have feathers and forelimbs modified into wings; they are warm-blooded.
Question 15 of 15
Which two classes of vertebrates are warm-blooded?
Pisces and Amphibia
Aves and Mammalia
Reptilia and Aves
Amphibia and Reptilia
Explanation: Only birds (Aves) and mammals are warm-blooded.