Point 19 of 21 — Module 6 — Biological Adaptations of Organisms in Aquatic EnvironmentsQuestion bank: 0 questions (0 with pictures)
19 6A.4 Other adaptations
Symbiosis: clown fish live among sea-anemone tentacles and are protected from stings by a coat of mucus, while they clean the anemone and defend it; coral and zooxanthellae (Module 7).
Defence: spines and venom (lionfish, stone fish), ink (octopus, squid), electric shock (electric catfish of the Nile), armour (crabs, turtles), and camouflage (flatfish, leaf-like sea dragons).
Reproduction in water: huge numbers of eggs in the plankton, parental care in some fish (tilapia mouth-brooding), and spawning at seasons when food is plentiful.
Temperature: fish of cold seas have antifreeze proteins (Module 11); desert-pool fish and killifish can tolerate high temperature and low oxygen.
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