Given below are two statements:
Statement I: Air bladder is present in Pristis which regulates buoyancy.
Statement II: In echinoderms, fertilization is usually external, development is indirect with free swimming larva.
In the light of the above statements choose the most appropriate answer from the options given below :
Text Solution
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An air bladder, which regulates buoyancy, is found in bony fishes (e.g., Exocoetus). While, Pristis is cartilaginous fish. They lack an air bladder due to which they have to swim constantly to avoid sinking.
In Phylum Echinodermata, the reproduction is sexual and the sexes are separate. Fertilization is usually external fertilization and development is indirect with free swimming larva and the larva is bilaterally symmetrical.
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