SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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“Cnidarians”
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“Ctenophora”
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“Porifera”
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“Polyp”
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Detailed explanation-1: -The phylum name Porifera means pore-bearing. Sponges take their name from small holes that cover their bodies. The history of life is written on the bodies of the animals that previously inhabited and continue to inhabit earth.
Detailed explanation-2: -Introduction to Porifera. Poriferans are commonly referred to as sponges. An early branching event in the history of animals separated the sponges from other metazoans. As one would expect based on their phylogenetic position, fossil sponges are among the oldest known animal fossils, dating from the Late Precambrian.
Detailed explanation-3: -The three classes are: 1. Calcarea or Calcispongiae-(Calcareous Sponges) 2. Hexactinellida or Triaxonida or Hyalospongiae-(Glass Sponge) 3. Demospongiae.
Detailed explanation-4: -Poriferan apomorphies Sponges were first recognised unequivocally as being animals by Ellis (1755), Pallas (1766) and Ellis & Solander (1786), although an acrimonious debate on this topic continued for at least a century (see Lévi, 1999).