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]Which of the following statements is correct regarding the given dichotomous key?

• A. The body of organism P is perforated by numerous pores called ostia whereas R possesses special stinging cells called cnidoblasts.
• B. The excretory system of Q consists of characteristic flame cells or protonephridia.
• C. The body wall of S consists of special stinging cells called choanocytes whereas body of T is differentiated into head, visceral mass and foot.
• D. Body of U bears paired locomotory appendages called parapodia.