Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski May 2026
Mouth (near the foot), stomach, liver, and intestine. They lack a radula (grating tongue). Plate-like gills (ctenidia) located in the mantle cavity. Excretory Two kidneys that open into the mantle cavity. Nervous Simplified, consisting of three pairs of ganglia. Ecological and Economic Importance
(class Bivalvia ) are a unique group of aquatic mollusks characterized by a shell consisting of two hinged valves and, most notably, the absence of a head . In the Grade 7 Biology curriculum by Sumatohin, they are studied as essential bio-filters and members of aquatic ecosystems. Key Biological Features
: Some species (pearl oysters) produce pearls and mother-of-pearl (nacre) used in jewelry.
: They are filter feeders . Water enters through an inhalant siphon, passes over the gills where food particles are trapped, and exits through an exhalant siphon.
Урок 2: Классы моллюсков - Ростелеком Лицей
: As filter feeders, they clean bodies of water by removing organic suspension.
: Species like oysters, mussels, and scallops are important food sources for humans and marine life.
: Swan mussels ( Anodonta ), thick-shelled river mussels ( Unio ), and giant clams ( Tridacna ).
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