Animal Kingdom
49 NEET Biology previous year questions on Animal Kingdom — options free on every question; 5 include the answer & explanation free, the rest unlock with PYQ Pass.
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 ?
[NEET 2026]
Petromyzon sp.
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The given organism shows primitive jawless vertebrate characters typical of cyclostomes, which represent early-diverging vertebrates.
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It possesses an endoskeleton made of cartilage, a characteristic feature of early vertebrates lacking true bone.
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It is ectoparasitic in nature and attaches to fishes using a circular sucking mouth for feeding and blood sucking.
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It lacks paired fins and scales but bears seven pairs of gill slits for respiration throughout its life cycle.
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These features are absent in Exocoetus, Branchiostoma, and Scoliodon, which do not show a parasitic sucking mouth condition or jawless state.
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Hence the organism best fits Petromyzon, a jawless cyclostome fish commonly known as lamprey found attached to marine fishes.
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Therefore correct identification among given options is Option C which corresponds to lamprey species.
The following are the statements about nonchordates :
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.
Choose the most appropriate answer from the options given below :
[NEET 2024]
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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:
[Re-NEET 2026]
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Consider the following statements :
A. Annelids are true coelomates
B. Poriferans are pseudocoelomates
C. Aschelminthes are acoelomates
D. Platyhelminthes are pseudocoelomates
Choose the correct answer from the options given below :
[NEET 2024]
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Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R) .
Assertion (A) : All vertebrates are chordates but all chordates are not vertebrate.
Reason (R) : The members of subphylum vertebrata possess notochord during the embryonic period, the notochord is replaced by a cartilaginous or bony vertebral column in adults.
In the light of the above statements,choose the correct answer from the options given below:
[NEET 2025]
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Select the incorrect statements from the following :
A. Digestive system in Platyhelminthes is incomplete.
B. Bilateral symmetry is a characteristic feature of adult Echinoderms.
C. Pseudocoelom is possessed by Aschelminthes.
D. Notochord is persistent throughout life in the class Chondrichthyes.
E. Members of class Reptilia maintain a constant body temperature.
Choose the answer from the options given below :
[NEET 2026]
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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:
[Re-NEET 2026]
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Consider the following statements :
A. Annelids are true coelomates
B. Poriferans are pseudocoelomates
C. Aschelminthes are acoelomates
D. Platyhelminthes are pseudocoelomates
Choose the correct answer from the options given below :
[NEET 2024]
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Sponges exchange \({O}_{2}\) with \(C{O}_{2}\) by _______.
[Re-NEET 2026]
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The following are the statements about non chordates :
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.
Choose the most appropriate answer from the options given below :
[NEET 2024]
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Select the set of fishes which belong to the class Osteichthyes :
[NEET 2026]
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Which of the following pairs is an incorrect match?
[Re-NEET 2024]
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All living members of the class Cyclostomata are:
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Open Circulatory system is present in :
[Re-NEET 2024]
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Open Circulatory system is present in :
[Re-NEET 2024]
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Given below are two statements : One is labelled Assertion A and the other is labelled as Reason R
Assertion A: Members of subphylum vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.
Reason R: Thus all chordates are vertebrates but not all vertebrates are chordates.
In the light of the above statements, choose the correct answer from the options given below.
[Re-NEET 2024]
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Consider the following statements :
A. Annelids are true coelomates
B. Poriferans are pseudocoelomates
C. Aschelminthes are acoelomates
D. Platyhelminthes are pseudocoelomates
Choose the correct answer from the options given below :
[NEET 2024]
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Which of the following pairs is an incorrect match?
[Re-NEET 2024]
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Which of the following is not a characteristic of chordates?
[Re-NEET 2026]
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Role of the water vascular system in Echinoderms is :
A. Respiration and Locomotion
B. Excretion and Locomotion
C. Capture and transport of food
D. Digestion and Respiration
E. Digestion and Excretion
Choose the correct answer from the options given below
[NEET 2025]
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Match List-I with List-II.
| LIST I | LIST II |
| A) Chondrichthyes | I) Clarias |
| B) Cyclostomata | II) Carcharodon |
| C) Osteichthyes | III) Myxine |
| D) Amphibia | IV) Ichthyophis |
Choose the correct answer from the options given below:
[Re-NEET 2024]
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The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as :
[NEET 2026]
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Read the following statements
A. Metagenesis is observed in helminths.
B. Echinoderms are triploblastic and coelomate animals.
C. Round worms have organ-system level of body organization.
D. Comb plates present in ctenophores help in digestion.
E. Water vascular system is characteristic of echinoderms.
Choose the correct answer from the options given below.
[NEET 2021]
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Match List-I with List-II.
| List-I | List-II | ||
| (A) | Taenia | (I) | Nephridia |
| (B) | Paramoecium | (II) | Contractile vacuole |
| (C) | Periplaneta | (III) | Flame cells |
| (D) | Pheretima | (IV) | Urecose gland |
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Radial symmetry is NOT found in adults of phylum:
[NEET 2023]
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The unique mammalian characteristics are
[NEET 2023]
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Bilaterally symmetrical and acoelomate animals are exemplified by
[NEET 2020]
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Match List-I with List-II
<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->
| List-I | List-II | ||
| (A) | Metamerism | (i) | Coelenterata |
| (B) | Canal system | (ii) | Ctenophora |
| (C) | Comb plates | (iii) | Annelida |
| (D) | Cnidoblasts | (iv) | Porifera |
Choose the correct answer from the options given below.
[NEET 2021]
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Match List-I with List-II
| List-I | List-II | ||
| (A) | Metamerism | (i) | Coelenterata |
| (B) | Canal system | (ii) | Ctenophora |
| (C) | Comb plates | (iii) | Annelida |
| (D) | Cnidoblasts | (iv) | Porifera |
Choose the correct answer from the options given below.
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All vertebrates are chordates, but all chordates are not vertebrates, why?
[Re-NEET 2020]
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Bilaterally symmetrical and acoelomate animals are exemplified by
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Match the following columns and select the correct option.
| Column-I | Column-II | ||
| (A) | Gregarious, polyphagous pest | (i) | Asterias |
| (B) | Adult with radial symmetry and larva with bilateral symmetry | (ii) | Scorpion |
| (C) | Book lungs | (iii) | Ctenoplana |
| (D) | Bioluminescence | (iv) | Locusta |
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Which one of the following organisms bears hollow and pneumatic long bones?
[NEET 2021]
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Select the correct statements with reference to chordates.
A. Presence of mid-dorsal, solid and double nerve cord.
B. Presence of closed circulatory system
C. Presence of paired pharyngeal gill slits
D. Presence of dorsal heart
E. Triploblastic pseudocoelomate animals
Choose the correct answer from the options given below:
[NEET 2023]
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Match List-I with List-II.
| List-I (Scientific Name) | List-II (Common Name) | ||
| (A) | Pterophyllum | (I) | Angel fish |
| (B) | Myxine | (II) | Hag fish |
| (C) | Pristis | (III) | Saw fish |
| (D) | Exocoetus | (IV) | Flying fish |
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Which of the following statements are true for the phylum-Chordata?
A. In Urochordata notochord extends from head to tail and it is present throughout their life.
B. In Vertebrata notochord is present during the embryonic period only.
C. Central nervous system is dorsal and hollow.
D. Chordata is divided into 3 subphyla: Hemichordata, Tunicata and Cephalchordata.
[NEET 2020]
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Given below are two statements :
Statement I: The presence or absence of hymen is not a reliable indicator of virginity.
Statement II: The hymen is torn during the first coitus only.
In the light of the above statements, choose the correct answer from the options given below:
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Match the following:
<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->
| List-I | List-II | ||
| (A) | Physalia | (i) | Pearl oyster |
| (B) | Limulus | (ii) | Portuguese Man of War |
| (C) | Ancylostoma | (iii) | Living fossil |
| (D) | Pinctada | (iv) | Hookworm |
Choose the correct answer from the options given below.
[NEET 2021]
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Match the following:
| List-I | List-II | ||
| (A) | Physalia | (i) | Pearl oyster |
| (B) | Limulus | (ii) | Portuguese Man of War |
| (C) | Ancylostoma | (iii) | Living fossil |
| (D) | Pinctada | (iv) | Hookworm |
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Which of the following options does correctly represent the characteristic features of phylum Annelida?
[Re-NEET 2020]
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Select the correct statements:
A.Platyhelminthes are triploblastic pseudocoelomate and bilaterally symmetrical organisms.
B. Ctenophores reproduce only sexually and fertilization is external.
C. In tapeworm, fertilization is internal but sexes are not separate.
D.Ctenophores are exclusively marine, diploblastic and bioluminescent organisms.
E. In sponges, fertilization is external and development is direct.
Choose the correct answer from the options given below:
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Match List-I with List-II.
| LIST I | LIST II |
| A) Chondrichthyes | I) Clarius |
| B) Cyclostomata | II) Charcharadon |
| C) Osteichthyes | III) Myxine |
| D) Amphibia | IV) Ichthyophis |
Choose the correct answer from the options given below:
[Re-NEET 2024]
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Match List-I with List-II.
| List-I | List-II | ||
| A. | Contractile vacuole | I. | Asterias |
| B. | Water vascular system | II. | Amoeba |
| C. | Canal system | III. | Spongilla |
| D. | Flame cells | IV. | Taenia |
Choose the correct answer from the options given below:
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Read the following statements.
A.Metagenesis is observed in Helminths.
B. Echinoderms are triploblastic and coelomate animals.
C. Round worms have organ-system level of body organization.
D.Comb plates present in ctenophores help in digestion.
E. Water vascular system is characteristic of Echinoderms.
Choose the correct answer from the options given below.
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Which of the following options does correctly represent the characteristic features of phylum Annelida?
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