Which of the following is responsible for excretion in Planaria?

Simple diffusion

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Nephridia

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Malphigian tubules

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Flame cells

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Nephrons

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Solution

The correct option is D Flame cells
Planaria belongs to phylum Platyhelminthes. Phylum Platyhelminthes has the following characteristic features:
(1) Free living, commensal, parasitic forms.
(2) Soft bodied, unsegmented worms: segmentation if present, not true.
(3) Body cavity (coelom) lacking.
(4) Excretory system includes a pair of tubules and protonephridia (flame cells)
Thus, option D is the correct answer.

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