Q. 105 Given below is the list of animals and their respective characteristics.
Animals
I. Sea anemone
II. Bluefly
III. Starfish
IV. Sponge
Characteristics
i. Three pairs of jointed legs
ii. Diploblastic acoelomate
iii. Collar cells
iv. Tube feet
Which ONE of the following represents the correct match?
(A) I-iv; II-i; III-ii; IV-iii
(B) I-iii; II-i; III-iv; IV-ii
(C) I-ii; II-i; III-iv; IV-iii
(D) I-ii; II-i; III-iii; IV – iv

Correct Answer: (C) I-ii; II-i; III-iv; IV-iii

Sea anemone (I) matches diploblastic acoelomate (ii), bluefly (II) matches three pairs of jointed legs (i), starfish (III) matches tube feet (iv), and sponge (IV) matches collar cells (iii).​

Option Breakdown

Each animal links to a defining biological trait from standard zoology classifications.

• Sea anemone: Cnidarian polyp, diploblastic (two germ layers: ectoderm, endoderm) and acoelomate (no body cavity), lacking mesoderm or coelom.​

• Bluefly: Arthropod insect in Diptera, with exactly three pairs of jointed legs as adult flies do.​

• Starfish: Echinoderm with tube feet for locomotion, feeding via water vascular system.​

• Sponge: Poriferan featuring choanocytes (collar cells) that create water currents for filter-feeding.​

Why Option C?

Option C correctly pairs all animals: I-ii (diploblastic acoelomate), II-i (jointed legs), III-iv (tube feet), IV-iii (collar cells). Other options mismatch traits, such as assigning collar cells to sea anemone or tube feet to sponges.​

Incorrect Options Explained

• (A) Wrong: Starfish not diploblastic acoelomate (echinoderms triploblastic, coelomate); sponges not tube feet.​

• (B) Wrong: Sea anemone not collar cells (cnidarians lack choanocytes); sponge not diploblastic acoelomate (poriferans parazoans).​

• (D) Wrong: Starfish not collar cells; sponge not tube feet (echinoderm trait).​