Direction: Refer to the given dichotomous key and answer the following questions.(I) (a) Cellular level of body organisation is present. - Go to IV(b) Tissue/Organ level of body organisation is present. - Go to II(II) (a) Radial symmetry is present. - Go to III (a)(b) Bilateral symmetry is present. - Go to III (b)(III) (a) It is acoelomate. - Go to V(b) It is true coelomate. - Go to VI(IV) (a) It is found in deep sea waters and is a costly wedding gift in Japan. – [P](b) It is commonly known as bath sponge. [Q](V) (a) It is commonly known as the sea anemone. – [R](b) It is commonly known as sea fur. – [S](VI) (a) It is segmented and sanguivorous. – [T](b) It bears jointed feet and chitinous exoskeleton. – [U]Identify organisms P, Q, R, S, T and U.

• A. P-Euplectella, Q-Spongia, R-Adamsia, S-Obelia, T-Hirudinaria, U-Periplanefa
• B. P-Fasciola, Q-Limax, R-Palaemon, S-Ascaris, T-Sepia, U-Wuchereha
• C. P-Asterias, Q-Nereis, R-Tubifex, S-Loligo, T-Hydra, U-Enterobius
• D. P-Pheretima, Q-Chiton, R-Antedon, S-Aphrodita, T-Aurelia, U-Sepia