Obelia is characterised by:A. Ciliated free-s | vedclass

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(C) Obelia (sea fur) belongs to the class $Hydrozoa$,phylum $Cnidaria$.$1$. After fertilization,a ciliated free-swimming larva called the planula larv

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$A, B$ and $D$

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(C) Obelia (sea fur) belongs to the class $Hydrozoa$,phylum $Cnidaria$.$1$. After fertilization,a ciliated free-swimming larva called the planula larva is formed ($A$ is correct).$2$. $Obelia$ exhibits alternation of generations,also known as metagenesis,where the polyp stage reproduces asexually and the medusa stage reproduces sexually ($B$ is correct).$3$. The medusae of $Obelia$ possess a true velum (a shelf-like fold of tissue),which makes them 'craspedote' medusae,not 'acraspedote' ($C$ is incorrect).$4$. The medusoid stage of $Obelia$ contains statocysts,which are sensory organs for balance ($D$ is correct).Therefore,the correct characteristics are $A, B$,and $D$.

Obelia is characterised by:
$A$. Ciliated free-swimming planula larva
$B$. Metagenesis
$C$. Acraspedote medusa
$D$. Statocysts present in medusoid stage

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Obelia is characterised by:$A$. Ciliated free-swimming planula larva$B$. Metagenesis$C$. Acraspedote medusa$D$. Statocysts present in medusoid stage