Multiple choice questions XXIX — task. Science CBSE, Class 9.

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1. Identify the excretory organs present in flatworms.

Renette glands
Malpighian tubule
Protonephridia
Nephridia

2. The stinging cells found in cnidaria are known as _____________.

Flame cells
Cnidoblasts
Haemocoel
Coelenteron

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