SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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protostome
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neutrostome
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deuterostome
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endostome
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Detailed explanation-1: -In protostomes, the site of gastrulation is said to give rise to the mouth, while in deuterostomes it forms the anus with the mouth arising from a second opening distant to the site of gastrulation.
Detailed explanation-2: -Protostome and deuterostome are terms for members of major taxonomic groups of animals categorized by how they develop as embryos. In protostomes, the first opening in the embryo becomes the mouth. In deuterostomes, the first opening in the embryo becomes the anus, and the mouth develops later.
Detailed explanation-3: -Protostomes versus Deuterostomes. The majority of coelomate invertebrates develop as protostomes ("first mouth") in which the oral end of the animal develops from the first developmental opening, the blastopore.
Detailed explanation-4: -Bivalve mollusks (clams, oysters, mussels, scallops) Leeches. Earthworms. Squid. Octopus. Snails and slugs. 28-Apr-2017