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NEET Biology MCQ
Quiz 1
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Q.1
Which one of these animals is not a Homotherm
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Chelone
0%
Camelus
0%
Psittacula
0%
Macropus
Explanation
Chelone (turtle) is a reptile — reptiles are ectotherms (cold-blooded/poikilotherms), regulating body temperature from the environment rather than internally. Camelus (camel) and Macropus (kangaroo) are mammals, and Psittacula (parakeet) is a bird — both mammals and birds are homeotherms (warm-blooded), so Chelone is the odd one out.
Q.2
Aschelminthes differs from other phyla in possessing
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Bilateral symmetry
0%
Parasitic mode
0%
Cylindrical Body
0%
Pseudocoelom
Explanation
Aschelminthes (roundworms/nematodes) are distinguished from other phyla by having a pseudocoelom — a body cavity that is present but not completely lined by mesoderm on all sides, unlike the true coelom of higher phyla.
Q.3
Radial symmetry occurs in
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Asterias
0%
Unio
0%
Schistosoma
0%
Taenia
Explanation
Asterias (starfish) belongs to Echinodermata, which shows radial symmetry (in the adult form). Unio (a bivalve mollusc), Schistosoma (a blood fluke) and Taenia (a tapeworm) are all bilaterally symmetric.
Q.4
Annelids do not have the following characters
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Triploblastic
0%
Metamerism
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Enterocoelic coelom
0%
Bilateral symmetry
Explanation
Annelids are triploblastic, metamerically segmented, and bilaterally symmetric — all three are genuine annelid features. What they do NOT have is an enterocoelic coelom; annelids are protostomes with a schizocoelous coelom (formed by splitting of mesodermal blocks), while an enterocoelic coelom (formed from outpocketings of the archenteron) is a deuterostome feature, found in echinoderms and chordates.
Q.5
Group of bilateral symmetrical, triploblastic animals is
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Aschelminthes
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Sponges
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Ctenophores
0%
Coelenterates
Explanation
Aschelminthes (roundworms) are bilaterally symmetric and triploblastic. Sponges lack true symmetry and organised tissue layers; Ctenophores and Coelenterates are radially (biradially) symmetric and diploblastic — none of the other three fit "bilateral + triploblastic".
Q.6
Animals having single opening for mouth and anus is
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Fasciola
0%
Asterias
0%
Octopus
0%
Ascidia
Explanation
Fasciola (liver fluke, Platyhelminthes) has an incomplete digestive system with just one opening that serves as both mouth and anus. Asterias, Octopus and Ascidia all have a complete digestive tract with separate mouth and anus.
Q.7
Functional system for specific physiological functions are absent in
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Annelids
0%
Arthropods
0%
Coelenterates
0%
Molluscs
Explanation
Coelenterates (Cnidaria) show only tissue-level organisation — cells are organised into tissues but not into true organs or organ systems dedicated to specific physiological functions, unlike annelids, arthropods and molluscs, which all have proper organ systems.
Q.8
Segmentation is first observed in
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Annelida
0%
Aschelminthes
0%
Arthropoda
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Platyhelminthes
Explanation
Annelida is the first phylum in the animal kingdom's increasing complexity to show true metameric segmentation — repetition of similar body segments along the main body axis.
Q.9
Which one is not a deuterostome
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Sea urchin
0%
Earthworms
0%
Sand dollar
0%
Ichthyophis
Explanation
Deuterostomes include Echinodermata (sea urchin, sand dollar) and Chordata (Ichthyophis, an amphibian). Earthworms belong to Annelida, which is a protostome phylum (blastopore becomes the mouth), not a deuterostome — making it the odd one out.
Q.10
Body cavity not lined by mesoderm which develops from archenteron is found in
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Platyhelminthes
0%
Nematodes
0%
Echinoderms
0%
Annelids
Explanation
A body cavity present but not fully lined by mesoderm derived from the archenteron describes a pseudocoelom, the defining feature of Nematodes (Aschelminthes). Platyhelminthes have no body cavity at all (acoelomate); Echinoderms and Annelids have a true, fully mesoderm-lined coelom.
Q.11
Metameric segmentation is the characteristics of
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Annelida and Arthropoda
0%
Platyhelminthes and Arthropoda
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Mollusca and Chordata
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Echinodermata and Annelida
Explanation
Metameric segmentation — the body built from a series of similar, repeating segments — is a defining characteristic shared by Annelida (e.g. earthworm) and Arthropoda (e.g. insects, crustaceans).
Q.12
Body cavity is the cavity present between the body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called
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Haemocoelomate
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Coelomate
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Pseudocoelomate
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Acoelomate
Explanation
By the definition given in the question itself — a body cavity present but not lined by mesoderm — this describes a pseudocoelomate animal (e.g. roundworms). A coelomate has a fully mesoderm-lined cavity, and an acoelomate has no body cavity at all.
Q.13
Coelomate animals in which blastopore forms anus is
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Protostomate
0%
Deutrostomate
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Blastostomate
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None of the above
Explanation
Deuterostomes (the source text's "Deutrostomate" is a spelling slip for Deuterostomate) are coelomate animals in which the blastopore (the first opening formed in the embryo) develops into the anus, with the mouth forming secondarily — "deutero-" literally means "second", referring to the secondary origin of the mouth.
Q.14
Enterocoelous cavity occurs in
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Protostomia
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Deuterostomia
0%
Blastostomia
0%
Astomia
Explanation
An enterocoelous coelom — one that forms from outpocketings of the archenteron (embryonic gut) — is characteristic of Deuterostomia, which includes echinoderms and chordates.
Q.15
Animals with mesoderm occurring in scattered pouches is
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Lancet
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Tapeworm
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Filaria worm
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Earthworm
Explanation
In pseudocoelomates such as Filaria worm (a nematode), the mesoderm does not form a continuous lining but occurs as scattered pouches between the ectoderm and endoderm. Lancet (Amphioxus) and Earthworm are true coelomates with a continuous mesodermal lining, and Tapeworm (a flatworm) is acoelomate with solid mesodermal tissue rather than scattered pouches.
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