Biology · chapter PYQs
Animal Kingdom, on the exam screen.
11 questions from NEET 2026, Re-NEET 2026, NEET 2020, 11 minutes, marked +4 / −1. See them with solutions.
Animal Kingdom · PYQs
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Q1/11
A group of researchers procured some fish like animals and upon investigation the following characters were observed: A. Endoskeleton was made of cartilage. B. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth. C. Paired fins and scales were absent, but 7 pairs of gill slits were present.
Which of the following species of animals did they consider to fit best with these characters?Answer and explanation
Answer: (2)
Petromyzon (lamprey) is a cyclostome with a cartilaginous endoskeleton, circular suctorial mouth, no scales or paired fins, and seven pairs of gill slits. It is ectoparasitic on fishes.
Scoliodon and Exocoetus are free-living fishes with paired fins, while Branchiostoma is a cephalochordate lacking the cyclostome-type suctorial mouth and parasitic habit.
These features identify Petromyzon.Select the set of fishes which belong to the class Osteichthyes:
Answer and explanation
Answer: (4)
Osteichthyes are the bony fishes. Flying fish (Exocoetus), angel fish (Pterophyllum) and fighting fish (Betta) are all bony fishes. The other sets include molluscs (cuttlefish), cyclostomes (hagfish), an echinoderm (starfish) or cartilaginous fishes (saw fish, dog fish), none of which are Osteichthyes.
Select the incorrect statements from the following and choose the answer from the options given below.
Statement I: Digestive system in Platyhelminthes is incomplete.
Statement II: Bilateral symmetry is a characteristic feature of adult Echinoderms.
Statement III: Pseudocoelom is possessed by Aschelminthes.
Statement IV: Notochord is persistent throughout life in the class Chondrichthyes.
Statement V: Members of class Reptilia maintain a constant body temperature.Answer and explanation
Answer: (2)
Statement II is wrong because adult echinoderms show radial symmetry (only their larvae are bilaterally symmetrical), and statement V is wrong because reptiles are poikilothermic (cold-blooded) and cannot maintain a constant body temperature. Statements I, III and IV are correct, so the incorrect pair is II and V, which is option (2).
Match List I with List II and choose the correct answer from the options given below.
List I
List II
P) Molluscs
I) Pulmonary respiration only
Q) Reptiles
II) Branchial respiration
R) Adult amphibians
III) Cellular respiration
S) Amoeba
IV) Pulmonary and cutaneous respiration
Answer and explanation
Answer: (1)
Molluscs respire through gills, i.e. branchial respiration (P-II), reptiles breathe only through lungs, i.e. pulmonary respiration (Q-I), adult amphibians use both lungs and moist skin, i.e. pulmonary and cutaneous respiration (R-IV), and Amoeba depends on cellular respiration by simple diffusion (S-III). This matches option (1).
Given below are two statements :
Statement I: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.
Statement II: In phylum Echinodermata, both adults and larvae are radially symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below :Answer and explanation
Answer: (3)
Radial symmetry means that any plane through the central body axis divides an organism into similar halves. Adult echinoderms are radial, but their larvae are bilateral, consistent with a bilateral ancestry. Statement I is true and statement II is false.
Given below are two statements:
Statement I: The class name Reptilia refers to creeping or crawling mode of locomotion.
Statement II: All organisms belonging to Reptilia have three chambered heart.
In the light of the above statements, choose the most appropriate answer from the options given below:Answer and explanation
Answer: (3)
The class name comes from the Latin repere or reptum, meaning to creep or crawl, so Statement I is correct. Statement II fails on a single well-known exception: CROCODILES have a four-chambered heart, while other reptiles such as lizards, snakes and turtles have three chambers. The word 'all' is what makes the statement false. NCERT Class 11, Animal Kingdom.
Which of the following is not a characteristic of chordates?
Answer and explanation
Answer: (3)
Chordates are defined by four fundamental features: a notochord, a dorsal hollow nerve cord, PAIRED PHARYNGEAL GILL SLITS and a post-anal tail. Gill slits are therefore present, not absent - even in terrestrial vertebrates they appear during embryonic development before being modified into other structures. NCERT Class 11, Animal Kingdom.
Bilaterally symmetrical and acoelomate animals are exemplified by
Answer and explanation
Answer: (1)
Platyhelminthes are bilaterally symmetrical and acoelomate, lacking a body cavity. Chapter: Animal Kingdom.
Match the following columns and select the correct option.
List I
List II
P) Gregarious, polyphagous pest
I) Asterias
Q) Adult with radial symmetry and larva with bilateral symmetry
II) Scorpion
R) Book lungs
III) Ctenoplana
S) Bioluminescence
IV) Locusta
Answer and explanation
Answer: (1)
Locusta is a gregarious polyphagous pest; adult Asterias has radial symmetry while its larva is bilateral; scorpions have book lungs; and Ctenoplana is bioluminescent. Thus P-IV, Q-I, R-II, S-III. Chapter: Animal Kingdom.
Which of the following statements are true for the phylum-Chordata?
Statement I: In Urochordata notochord extends from head to tail and it is present throughout their life.
Statement II: In Vertebrata notochord is present during the embryonic period only.
Statement III: Central nervous system is dorsal and hollow.
Statement IV: Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.Answer and explanation
Answer: (3)
Statement I is false because urochordates retain the notochord only in the larval tail. Statement IV is false because Hemichordata is not a chordate subphylum. Statements (II) and (III) are true. Chapter: Animal Kingdom.
Match the following columns and select the correct option.
List I
List II
P) 6-15 pairs of gill slits
I) Trygon
Q) Heterocercal caudal fin
II) Cyclostomes
R) Air bladder
III) Chondrichthyes
S) Poison sting
IV) Osteichthyes
Answer and explanation
Answer: (4)
Cyclostomes have 6-15 pairs of gill slits; Chondrichthyes have a heterocercal caudal fin; Osteichthyes generally have an air bladder; and Trygon bears a poison sting. Thus P-II, Q-III, R-IV, S-I. Chapter: Animal Kingdom.
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