Which phylum of the Kingdom Animalia exhibits an organ-system level of organisation and has a mantle or mass of soft flesh that envelops the soft body and surrounds the internal organs?

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SSC JE Electrical 15 Nov 2022 Shift 2 Official Paper

Answer 1

The correct answer is Phylum Mollusca.Key Points

Molluscans are the most diverse animals and form an important part of the ecosystem in world.
Example: Some of the examples of Phylum Mollusca are snails, octopuses, squids, oysters, clams, etc.
Many organisms belonging to this phylum have a calciferous shell. The bodies are generally soft and are covered by a hard exoskeleton.
They are found in terrestrial regions as well as in the depths of the seas.
Thus, these organisms are said to have an organ system-level organization.
The organ system level of organization is when two or more tissues work together to perform a specific function also these organisms have a mantle or mass of soft flesh that envelops their soft body and surrounds their internal organs.
Therefore, the correct answer is: Phylum Mollusca

Additional Information

Phylum	Description
Phylum Ctenophora	Ctenophora are also referred to as sea walnuts or comb jellies. The existence of comb plates containing cilia that are employed for propulsion is the phylum's defining characteristic.
Phylum Porifera	As a sister group to the diploblastic, the species of the phylum Porifera, or sponges, constitute a basic animal lineage. They are multicellular organisms with numerous channels and holes that enable water to pass through them.
Phylum Coelenterata	The Coelenterates are primarily marine and aquatic creatures. The body is tissue-level organized and axially symmetrical. Their sensitive tentacles encircle their jaws, which aid in capturing their prey.