AP BIOLOGY

Detailed explanation-1: -The inner surface of each statocyst is lined with 130, 000-150, 000 primary sensory hair cells. The hair cells are of two morphological types. Type A hair cells carry 10-15 kinocilia arranged in a single ciliary row; they are present in the ventral half of the statocyst.

Detailed explanation-2: -Statocysts are paired organs, located at the base of the antennules in decapods or at the base of the uropods in mysids, that enable the crustacean to orient itself with respect to gravity.

Detailed explanation-3: -The statocyst is a balance sensory receptor present in some aquatic invertebrates, including bivalves, cnidarians, ctenophorans, echinoderms, cephalopods, and crustaceans. A similar structure is also found in Xenoturbella.

Detailed explanation-4: -Sense organs are the specialized organs composed of sensory neurons, which help us to perceive and respond to our surroundings. There are five sense organs – eyes, ears, nose, tongue, and skin.