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Q.

Match column I with column II.
Column I                                      Column II
(a) Obelia                                   (i) exhibit medusae body form
(b) Aurelia                                 (ii) lives in a colony
(c) Hydra                                  (iii) central cavity
(d) Gastrovascular                     (iv) freshwater organism
 

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a

(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)

b

 (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
 

c

(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

d

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

answer is B.

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Detailed Solution

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Concept: Obelia and Corals live in a colony.
Medusae is free living and umbrella shaped. Aurelia exhibits  medusae body form.
Hydra lives in freshwater.
Gastrovascular is the cavity present in the Cnidarian.
(a) Obelia - live in colony
(b) Aurelia - exhibit medusae body form
(c) Hydra - freshwater organisms
(d) Gastrovascular - central cavity

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