Why Are Molluscs Called Soft-Bodied Animals Despite Having Hard Exoskeletons?
Molluscs, a diverse group of invertebrates, are often referred to as "soft-bodied" animals, despite many species possessing hard exoskeletons made of a calcium carbonate shell. This apparent contradiction can be explained by the anatomy and physiology of molluscs.
While molluscs have exoskeletons, their bodies are primarily composed of soft tissues such as muscles, digestive organs, and gills. The exoskeleton, often called a shell, provides protection and support for the soft body but does not fully enclose it. In many species, the soft body extends beyond the shell, making it vulnerable to predators and desiccation.
Furthermore, molluscs have a unique muscular foot that allows them to move and attach to surfaces. This foot, along with other soft tissues, is often exposed and therefore considered part of the animal's soft body, contributing to the overall characterization as "soft-bodied."
In summary, molluscs are called soft-bodied animals because their bodies consist predominantly of soft tissues, despite the presence of a hard exoskeleton. The exoskeleton provides protection but does not fully enclose the soft body, leaving some parts exposed and vulnerable.
FAQs:
- What is an exoskeleton? An external skeleton that provides protection and support.
- What is a mollusc? An invertebrate animal with a soft body, often protected by a shell.
- Why are molluscs called soft-bodied? Because their bodies are primarily composed of soft tissues, even species with hard exoskeletons.
- What is the purpose of a muscular foot in molluscs? Movement and attachment to surfaces.
- Do all molluscs have shells? No, some species, like slugs, have reduced or no shells.
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