Animal Kingdom Previous Year Questions — NEET Biology

4 past-year Animal Kingdom questions from NEET (Biology).

Q142 (2024)

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?
  1. Exocoetus sp.
  2. Branchiostoma sp.
  3. Petromyzon sp.
  4. Scoliodon sp.
### Related Formula $\text{Class Cyclostomata: } \text{Circular sucking mouth without jaws} + \text{No paired fins/scales} + \text{6--15 pairs gill slits} + \text{Ectoparasites}$ ### Core Logic The given features—cartilaginous endoskeleton, ectoparasitic nature with circular sucking mouth, absence of paired fins and scales, and presence of 6–15 pairs (7 pairs in this specific example) of gill slits—are defining characteristics of Class Cyclostomata. *Petromyzon* (Lamprey) belongs to Cyclostomata. ### Step 1: Option Verification * *Exocoetus* (Flying fish) $\rightarrow$ Osteichthyes (scales and paired fins present) * *Branchiostoma* (Amphioxus) $\rightarrow$ Cephalochordata * *Petromyzon* (Lamprey) $\rightarrow$ Cyclostomata (matches all given characteristics) * *Scoliodon* (Dog fish) $\rightarrow$ Chondrichthyes (scales and paired fins present) ### Pattern Recognition Sees: "circular sucking mouth", "no scales/paired fins", "ectoparasitic". Shortcut: Cyclostomata $\rightarrow$ *Petromyzon* (lamprey). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Animal Kingdom

Q150 (2024)

The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as:
  1. Struthio
  2. Psittacula
  3. Neophron
  4. Aptenodytes
### Related Formula $\text{Aptenodytes (Penguin)} \rightarrow \text{Flightless bird with paddle-like flippers for swimming}$ ### Core Logic * *Aptenodytes* (Penguin) is a flightless bird whose forelimbs are modified into paddle-like flippers adapted for swimming. * *Struthio* (Ostrich) is a flightless bird, but its forelimbs are reduced and not adapted for swimming. * *Neophron* (Vulture) and *Psittacula* (Parrot) are flying birds. ### Step 1: Conclusion The correct flightless bird with paddle-like forelimbs for swimming is *Aptenodytes*. ### Pattern Recognition Sees: "flightless bird paddle-like structures swimming". Shortcut: *Aptenodytes* (Penguin). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Animal Kingdom

Q153 (2024)

Select the set of fishes which belong to the class Osteichthyes:
  1. Devil fish, Cuttlefish and Hagfish
  2. Starfish, Hagfish and Cuttlefish
  3. Flying fish, Angel fish and Fighting fish
  4. Saw fish, Fighting fish and Dog fish
### Related Formula $\text{Class Osteichthyes (Bony Fishes): } \text{Flying fish (Exocoetus), Angel fish (Pterophyllum), Fighting fish (Betta)}$ ### Core Logic Evaluating the options: * Option (1): Devil fish (*Octopus*) and Cuttlefish (*Sepia*) are Molluscs; Hagfish (*Myxine*) is a Cyclostome. * Option (2): Starfish (*Asterias*) is an Echinoderm. * Option (3): Flying fish (*Exocoetus*), Angel fish (*Pterophyllum*), and Fighting fish (*Betta*) are all bony fishes belonging to Class Osteichthyes. * Option (4): Saw fish (*Pristis*) and Dog fish (*Scoliodon*) belong to Class Chondrichthyes (cartilaginous fishes). ### Step 1: Conclusion Option (3) correctly lists members belonging exclusively to Class Osteichthyes. ### Pattern Recognition Sees: "Class Osteichthyes set". Shortcut: Flying fish (*Exocoetus*), Angel fish (*Pterophyllum*), Fighting fish (*Betta*). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Animal Kingdom

Q171 (2024)

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:
  1. B and E only
  2. C and D only
  3. A and C only
  4. B and D only
### Related Formula $\text{Adult Echinoderms} = \text{Radial symmetry}, \quad \text{Reptilia} = \text{Poikilothermous (Cold-blooded)}$ ### Core Logic Evaluation of statements: * A (Correct): Platyhelminthes have a single opening to the exterior serving as both mouth and anus (incomplete digestive system). * B (Incorrect): Adult echinoderms exhibit RADIAL symmetry; bilateral symmetry is present in their larval forms. * C (Correct): Aschelminthes are pseudocoelomates. * D (Correct): Notochord persists throughout life in Chondrichthyes. * E (Incorrect): Reptiles are poikilotherms (cold-blooded) and cannot maintain a constant body temperature. ### Step 1: Conclusion Statements B and E are incorrect. ### Pattern Recognition Sees: "adult echinoderms bilateral symmetry" (False, radial) and "reptiles maintain constant body temp" (False, cold-blooded). Shortcut: Incorrect statements are B and E. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Animal Kingdom
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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