OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Class Holothuroidea, sea cucumbers
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Class Asteroidea, Starfish
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Class Echinodea, sea urchins
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Class Crinoidea, sea lilies and feather stars
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Detailed explanation-1: -Defensive Adaptations When threatened, some sea cucumbers discharge sticky threads to ensnare their enemies. Others can mutilate their own bodies as a defense mechanism. They violently contract their muscles and jettison some of their internal organs out of their anus.
Detailed explanation-2: -A toxic secretion has been identified in species belonging to the genus Holothuria, particularly H. atra. This secretion is burgundy in color and is thought to be a toxin that was used by inhabitants of the Pacific to poison fish, thus it is most likely utilized as a defense mechanism by the sea cucumber (Delia, 1977).
Detailed explanation-3: -Echinoderms use their regenerative abilities as a defensive mechanism, frequently utilized by starfish when caught by an arm. When this happens, these animals will just drop off an arm and move away. The unwary attacker is left with a wiggling arm while the rest of the animal moves away to regenerate a new arm.