question_answer

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