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(a) Stream lined body (b) Four pair of...

(a) Stream lined body
(b) Four pair of gills
(c) Air bladder is present
(d) In males pelvic fins bear claspers (e) Two chambered heart
(f) Fertilization is usually external
How many statements are correct for the members of class osteichthyes?

A

one

B

two

C

five

D

six

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many statements are correct for the members of class Osteichthyes, we will evaluate each statement one by one. 1. **Streamlined body**: - Osteichthyes, or bony fishes, have a streamlined body shape that reduces water resistance while swimming. - **Conclusion**: This statement is correct. 2. **Four pairs of gills**: - Osteichthyes typically have one pair of gills covered by an operculum, not four pairs. They have a single gill slit on each side, which allows for efficient respiration. - **Conclusion**: This statement is incorrect. 3. **Air bladder is present**: - Osteichthyes possess a swim bladder (or air bladder), which helps them maintain buoyancy in water. - **Conclusion**: This statement is correct. 4. **In males, pelvic fins bear claspers**: - Claspers are a feature of male Chondrichthyes (cartilaginous fishes like sharks and rays) used for reproduction. Osteichthyes do not have claspers; instead, they have different reproductive structures. - **Conclusion**: This statement is incorrect. 5. **Two-chambered heart**: - Osteichthyes have a two-chambered heart, consisting of one atrium and one ventricle, which is typical for fish. - **Conclusion**: This statement is correct. 6. **Fertilization is usually external**: - Most Osteichthyes exhibit external fertilization, where eggs and sperm are released into the water. - **Conclusion**: This statement is correct. Now, let's summarize the correctness of each statement: - Statement (a): Correct - Statement (b): Incorrect - Statement (c): Correct - Statement (d): Incorrect - Statement (e): Correct - Statement (f): Correct **Total Correct Statements**: 4
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