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Which of the following is/are not the characteristics of the class Osteichthyes?
(i) Body is streamlined and mouth is terminal.
(ii) Gills are covered by operculum.
(iii) Skin covered with cycloid and placoid scales.
(iv) Many of them are viviparous. 
  • a)
    (iv) only    
  • b)
    (iii) and (iv)
  • c)
    (i), (iii) and (iv)
  • d)
    (i) and (iv)
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which of the following is/are not the characteristics of the class Ost...
Not Characteristics of Osteichthyes

(i) Body is streamlined and mouth is terminal:
This characteristic is actually a defining feature of Osteichthyes. They are bony fish that have a streamlined body shape and terminal mouth position.

(ii) Gills are covered by operculum:
This is another defining feature of Osteichthyes. They have a bony plate, called an operculum, that covers and protects the gills.

Characteristics of Osteichthyes

(iii) Skin covered with cycloid and placoid scales:
Osteichthyes do have scales covering their skin, but they are not both cycloid and placoid. Cycloid scales are found in some fish, but not Osteichthyes. Instead, Osteichthyes have ganoid or ctenoid scales.

(iv) Many of them are viviparous:
Osteichthyes are mostly oviparous, which means they lay eggs that hatch outside of the mother's body. There are some viviparous species within Osteichthyes, but this is not a characteristic of the entire class.

Conclusion:
Therefore, the correct answer is option (c) (i), (iii), and (iv), as these characteristics are not accurate descriptions of Osteichthyes.
Free Test
Community Answer
Which of the following is/are not the characteristics of the class Ost...
In Osteichthyes, skin is covered with cycloid/ctenoid scales. They are mostly oviparous.
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Which of the following is/are not the characteristics of the class Osteichthyes?(i) Body is streamlined and mouth is terminal.(ii) Gills are covered by operculum.(iii) Skin covered with cycloid and placoid scales.(iv) Many of them are viviparous.a)(iv) only b)(iii) and (iv)c)(i), (iii) and (iv)d)(i) and (iv)Correct answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following is/are not the characteristics of the class Osteichthyes?(i) Body is streamlined and mouth is terminal.(ii) Gills are covered by operculum.(iii) Skin covered with cycloid and placoid scales.(iv) Many of them are viviparous.a)(iv) only b)(iii) and (iv)c)(i), (iii) and (iv)d)(i) and (iv)Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is/are not the characteristics of the class Osteichthyes?(i) Body is streamlined and mouth is terminal.(ii) Gills are covered by operculum.(iii) Skin covered with cycloid and placoid scales.(iv) Many of them are viviparous.a)(iv) only b)(iii) and (iv)c)(i), (iii) and (iv)d)(i) and (iv)Correct answer is option 'B'. Can you explain this answer?.
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