S - Statement: The presence of cnidoblasts is | vedclass

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(B) The statement $S$ is true because cnidoblasts (or stinging cells) are indeed a unique and defining characteristic of the phylum Cnidaria,used for

Vedclass · Accepted Answer

$S$ and $R$ are both true,but $R$ is not the correct explanation of $S$.

Vedclass · Answer

(B) The statement $S$ is true because cnidoblasts (or stinging cells) are indeed a unique and defining characteristic of the phylum Cnidaria,used for anchorage,defense,and capturing prey.The reason $R$ is also true because sponges (phylum Porifera) exhibit specific larval stages such as amphiblastula or parenchymula during their life cycle.However,the presence of specific larvae in sponges does not explain why cnidoblasts are present in Cnidarians. These are two independent biological facts belonging to different phyla. Therefore,$R$ is not the correct explanation for $S$.

Column-$I$	Column-$II$
$I.$ Hepatopancreas	$p.$ Mollusca
$II.$ Digestive tract with digestive glands	$q.$ Arthropoda
$III.$ Digestive tube straight or coiled	$r.$ Hemichordata
$IV.$ Straight or $U$-shaped digestive tract	$s.$ Echinodermata

$S$ - Statement: The presence of cnidoblasts is a characteristic feature of Cnidarians.
$R$ - Reason: In sponges,amphiblastula or parenchymula larvae are observed.

Similar Questions

Match the following columns:
Column-$I$ Column-$II$
$I.$ Hepatopancreas $p.$ Mollusca
$II.$ Digestive tract with digestive glands $q.$ Arthropoda
$III.$ Digestive tube straight or coiled $r.$ Hemichordata
$IV.$ Straight or $U$-shaped digestive tract $s.$ Echinodermata

Which one of the following groups of three animals is correctly matched with their one characteristic morphological feature?

Give one example each for an animal possessing placoid scales and that with cycloid scales.

State the location and function of the following:
$(i)$ Nephridia
$(ii)$ Mantle cavity

$S$ - Statement: In $Ascaris$,excretion occurs through flame cells.
$R$ - Reason: Platyhelminthes possess a complete digestive system.

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$S$ - Statement: The presence of cnidoblasts is a characteristic feature of Cnidarians.$R$ - Reason: In sponges,amphiblastula or parenchymula larvae are observed.