First slide

Classification of Animals

Question

Structures helpful for excretion and osmoregulation are
(a) nematocysts
(b) nephridia
(c) comb plates
(d) flame cells
(e) spicules
Choose the correct answer from the options given below.

Moderate

A

(b) and (d) only
B

(a) and (d) only
C

(b), (c) and (d)
D

(a), (b) and (d)

Solution

Flame cells (found in flatworms) and nephridia (found in annelids) help for excretion and osmoregulation.
Nematocysts of cnidarians help in defense, anchorage and capture of the prey.
Comb plates of ctenophores help in locomotion.
Spicules constitute the skeleton of sponges.

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