Question

Match the columns and find the correct option

(a)	Choanocytes	(i)	Arthropoda
(b)	Cnidoblasts	(ii)	Ctenophora
(c)	Green gland	(iii)	Porifera
(d)	Nephridia	(iv)	Coelenterata
(e)	Comb plates	(v)	Annelida

• A. (a)-(ii), (b)-(i), (c)-(iv), (d)-(v), (e)-(iii)
• B. (a)-(ii), (b)-(iv), (c)-(i), (d)-(v), (e)-(iii)
• C. (a)-(v), (b)-(i), (c)-(iii), (d)-(ii), (e)-(iv)
• D. (a)-(iii), (b)-(iv), (c)-(i), (d)-(v), (e)-(ii).

Answer 1

The correct option is D (a)-(iii), (b)-(iv), (c)-(i), (d)-(v), (e)-(ii).

a) Choanocytes- The body wall of Porifera consists of two imperfect layers: outer dermal layer, an inner choanocyte layer which consists of characteristic flagellated collar cells, or choanocytes.

b) Cnidoblasts- The body wall of Coelenterata consists of two distinct layers of cells: epidermis and gastrodermis which has many cells- cnidoblasts, interstitial cells, epitheliomuscular cells.

c) Green gland- In arthropods in class Crustacea excretion takes place by green glands.

d) Nephridia- In annelids, the excretory system consists of coiled tubules, the metanephridia.

e) Comb plates- In Ctenophora ciliary locomotion takes place by special ciliated tracts called comb plates.

So, the correct answer is option D- '(a)- (iii), (b)- (iv), (c)-(i), (d)-(v),(e)- (ii)'.