Question

Please be very clear and detailed in your response.

How can radial symmetry be an advantage to slow moving or sessile marine organisms? Use the body plan and lifestyle of a sea star for answers.

Answer 1

CA Sea Star is echinoderm belonging to class Asteroidea. Most sea Stars have five arms emerging out from a Central disc but the number of arms varies with the species. Sea stars exhibit) radial symmetry ! Radial symmetry is a type of body plan in which organism can be divided ente I similar parts by a plane passing along central axes Radial symmetry confers certain advantages to the r organisms. Most radially symmetrical V organisms move slowly . In radially symmetrical organismo the sensory structureds are evenly distributed o I around the body. It is highly advantageous because the symmetrically distributed sensory receptons enable the organism to detect stimulus and respond to it from all the directions C stimuli being food and threat mainly). So it will be great- for a slow moving organism to have sensory receptors all around the body enabling it to get helpful stimuli without- moving to much. - This is not the only advantage of radial Symmetry. This type of Tes su oder with symmetry facilitates regeneration

classmate Date Page e body even a foarts. Sea lost arm. an arm to lost arm that part abutate a the brovided amputate and the star can regenerale Sea stars calln avoid a loredator can be regenerated of central disc should be present. To CamScanner

Central dise ' eyespot mouth Sea stars have eyesputs at end of each cary Scalinesewithey espots can detect light & darleness ITSTATTET