Author: Study Clue

In most molluscs, the “true coelom” is not the main body cavity because the largest body space is the A

In a typical gastropod, the thin flap that helps close the shell aperture is the A Mantle girdle B Pallial

Molluscs are placed in Lophotrochozoa mainly because many show A Notochord B Water vascular system C Tracheal tubes D Trochophore

In most molluscs, the main blood-filled body space is called the A Coelom B Hemocoel C Nephridial sac D Gastric

Molluscs are described as “soft-bodied” mainly because they typically have A No body cavity B Only cartilaginous parts C Hard

The chitin in arthropod exoskeleton is chemically a A Lipid polymer B Protein chain C Mineral salt D Nitrogen polysaccharide

The name of the outer, non-living part of insect cuticle is A Cuticle B Epidermis C Procuticle D Mesoderm Explanation

The hard plate-like region covering the cephalothorax in many crabs is the A Carapace B Ootheca C Chrysalis D Labellum

The living layer that secretes the arthropod cuticle is the A Endodermis B Mesoglea C Peritoneum D Epidermis Explanation The

The hard outer covering in arthropods is mainly made of A Calcium phosphate B Cellulose C Keratin D Chitin Explanation