Q.Match the column A with column B and choose the correct option Column I: A. Porifera, B. Aschelminthes, C. Annelida, D. Arthropoda, E. Echinodermata
Column II: i. Canal system, ii. Water-vascular system, iii. Muscular pharynx, iv. Jointed appendages, v. Metameres

The correct option is (C) A-i, B-iii, C-v, D-iv, E-ii.

• Porifera (A) is defined by the canal (water-transport) system (i).
• Aschelminthes (B) has a well-developed muscular pharynx (iii).
• Annelida (C) shows metameres, the repeated segments (v).
• Arthropoda (D) is defined by jointed appendages (iv). …

Every phylum in the animal kingdom carries one especially characteristic structural feature, and this question asks for those pairings.

• Porifera (sponges) are defined by their water-transport, or canal, system — water enters through ostia, passes through the spongocoel, and exits via the osculum — matching A with i (canal system).
• Aschelminthes (roundworms) possess a complete alimentary canal with a well-developed muscular pharynx that helps draw in and move food — matching B with iii (muscular pharynx).
• Annelida are marked by metameric segmentation, where the body is divided into repeated ring-like segments called metameres — matching C with v (metameres). …

Method: One-word-per-phylum flashcard method

Instead of matching each Column-I phylum against Column-II features as unrelated pairs, first build a mental flashcard for each phylum with just ONE single-word hallmark structure, then read the whole match off the flashcards at once.

Build the flashcards:

• Porifera → hallmark = canal system (the ostia-spongocoel-osculum water-transport route).
• Aschelminthes → hallmark = muscular pharynx (a well-developed part of their complete alimentary canal).
• Annelida → hallmark = metameres (the repeated ring-like segments giving the phylum its very name).
• Arthropoda → hallmark = jointed appendages (built directly into the name: "arthros" = joint, "poda" = appendage).
• Echinodermata → hallmark = water-vascular system (the unique tube-feet-powering canal network).

Read the match directly off the flashcards: A (Porifera) → i (canal system); B (Aschelminthes) → iii (muscular pharynx); C (Annelida) → v (metameres); D (Arthropoda) → iv (jointed appendages); E (Echinodermata) → ii (water-vascular system). …