Home
Class 11
BIOLOGY
Assertion: Osteichthyes fishes swim cons...

Assertion: Osteichthyes fishes swim constantly to avoid sinking .
Reason: Air bladder is absent in fishes of Class Osteichthyes.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given assertion and reason, let's break down the information step by step. ### Step 1: Understand the Assertion The assertion states that "Osteichthyes fishes swim constantly to avoid sinking." - Osteichthyes, also known as bony fishes, possess a structure called the swim bladder. This organ helps them maintain buoyancy in the water. Therefore, they do not need to swim constantly to avoid sinking. ### Step 2: Understand the Reason The reason given is "Air bladder is absent in fishes of Class Osteichthyes." - This statement is incorrect. Osteichthyes fishes actually have a swim bladder (air bladder), which is crucial for buoyancy. In contrast, cartilaginous fishes (Class Chondrichthyes) do not have a swim bladder and must swim continuously to avoid sinking. ### Step 3: Evaluate the Relationship Between Assertion and Reason - The assertion is false because Osteichthyes do not need to swim constantly due to the presence of the swim bladder. - The reason is also false because Osteichthyes do have an air bladder. ### Conclusion Both the assertion and the reason are false. The assertion does not accurately describe the behavior of Osteichthyes, and the reason incorrectly states the presence of the swim bladder in these fishes. ### Final Answer Both the assertion and the reason are false. ---
To analyze the given assertion and reason, let's break down the information step by step. ### Step 1: Understand the Assertion The assertion states that "Osteichthyes fishes swim constantly to avoid sinking." - Osteichthyes, also known as bony fishes, possess a structure called the swim bladder. This organ helps them maintain buoyancy in the water. Therefore, they do not need to swim constantly to avoid sinking. ### Step 2: Understand the Reason ...
Promotional Banner

Topper's Solved these Questions

  • ANIMAL KINGDOM

    NCERT FINGERTIPS ENGLISH|Exercise Animal Kingdom|148 Videos

  • ANIMAL KINGDOM

    NCERT FINGERTIPS ENGLISH|Exercise NCERT examples problems|13 Videos

  • ANATOMY OF FLOWERING PLANTS

    NCERT FINGERTIPS ENGLISH|Exercise Anatomy Of Flowering Plants|143 Videos

  • BIOLOGICAL CLASSIFICATION

    NCERT FINGERTIPS ENGLISH|Exercise Biological Classification|132 Videos

Similar Questions

Explore conceptually related problems

Air bladder in bony fishes helps in

Air bladder in a fish helps in

Air bladder is found in which of the following fishes?

Why cartilaginous fishes have to swim constantly?

How. important is the presence of air bladder in bony fishes?

Assertion:Air sacs are connected to lungs in Class Aves. Reason: Air sacs supplement respiration in birds.

Read the following statements and find out the correct statement. a. urinary bladder is absent in fishes. b. gambusia fish eradicates mosquito larva c. ampulla of lorenzini present in dog fish act as thermoreceptors. d. electric organs are modified muscles.

Which one of the following fishes does not belong to class osteichthyes ?

Choose the correct statements : I. Cartilaginous fish swims continously due to the presence of an air bladder. II. Osteichthyes have four pairs of gills that are covered by an operculum. III. The notochord is persistent throughout life in Chondrichthyes. IV. Teeth of cartilaginous fishes are modified placoid scales.

Assertion: Amphibians have evolved from fishes. Reason: Archaeopteryx is a fossil linking fishes and amphibians.