Assertion: Cartilaginous fish swim constantly to avoid sinking.
Reason: In cartilaginous fishes, the air bladder is absent.
Reason: In cartilaginous fishes, the air bladder is absent.
- ABoth Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
- BBoth Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
- CAssertion is True but the Reason is False.
- DBoth Assertion & Reason are False.
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Which of the following statements are not true about shark?
$a$. The skin is tough and covered with placoid scales
$b$. They possess a swim bladder which regulates buoyancy
$c$. The tail of shark is heterocercal
$d$. Ampulla of Lorenzini present in the snout of shark is a thermoreceptor.
$e$. It has five pairs of gill slits covered by operculum
$a$. The skin is tough and covered with placoid scales
$b$. They possess a swim bladder which regulates buoyancy
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