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Kingdom Animalia Metazoa - Questions and Answers

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161. Digestive system is absent in
A. Arthropoda
B. Nematoda
C. Platyhelminthes
D. Porifera
Explanation:
162. Spicules of silica occur in
A. Hyalonema
B. Sycon
C. Leucosolenia
D. Grantia
Explanation:
163. Tissues are absent in the body of
A. Platyhelminthes
B. Sponges
C. Arthropoda
D. Annelida
Explanation:
164. Boring sponge is
A. Cliona
B. Euplectella
C. Chalina
D. Hyalonema
Explanation:
165. The middle layer in body wall of porifera is
A. Mesoderm
B. Mesenchyme
C. Mesogloea
D. Mesentery
Explanation:
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