Q.

In echinoderms, specialised excretory organs are

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a

Malphigiam tubules

b

nephridia

c

proboscis glands

d

absent

answer is D.

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Detailed Solution

In echinoderms, special excretory organs are absent. Excretory wastes diffuse out through respiratory surfaces such as tube feet.Malpighian tubules - ArthropodaNephridia - AnnelidaProboscis gland - Hemichordata
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