NEET · Biology —

Animal Kingdom appeared 4 times across 1 year — 4.4% of Biology. This question is from Class Osteichthyes Examples.

Year 2024 Total
Questions 4 4
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Select the set of fishes which belong to the class Osteichthyes:

Solution & Explanation

Related Formula

Class Osteichthyes (Bony Fishes): 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).

Chapter Mix

Class 11 Biology: Animal Kingdom

Reference Study Guides

Animal Kingdom

More Animal Kingdom Previous-Year Questions

Q142 neet_2024_05_may_morning Class Cyclostomata Features
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?
  • A. Exocoetus sp.
  • B. Branchiostoma sp.
  • C. Petromyzon sp.
  • D. Scoliodon sp.

Solution

Related Formula

Class Cyclostomata: Circular sucking mouth without jaws + No paired fins/scales + 6--15 pairs gill slits + 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) arrow Osteichthyes (scales and paired fins present)
  • Branchiostoma (Amphioxus) arrow Cephalochordata
  • Petromyzon (Lamprey) arrow Cyclostomata (matches all given characteristics)
  • Scoliodon (Dog fish) arrow Chondrichthyes (scales and paired fins present)
Pattern Recognition

Sees: "circular sucking mouth", "no scales/paired fins", "ectoparasitic". Shortcut: Cyclostomata arrow Petromyzon (lamprey).

Chapter Mix

Class 11 Biology: Animal Kingdom

Q150 neet_2024_05_may_morning Class Aves Adaptations
The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as:
  • A. Struthio
  • B. Psittacula
  • C. Neophron
  • D. Aptenodytes

Solution

Related Formula

Aptenodytes (Penguin) arrow 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).

Chapter Mix

Class 11 Biology: Animal Kingdom

Q171 neet_2024_05_may_morning General Characteristics of Animal Phyla
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:
  • A. B and E only
  • B. C and D only
  • C. A and C only
  • D. B and D only

Solution

Related Formula

Adult Echinoderms = Radial symmetry, Reptilia = 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.

Chapter Mix

Class 11 Biology: Animal Kingdom

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