Q.Match the following and write correct choice in space provided Animal / Characteristics
a. Pila / i. Jointed appendages
b. Cockroach / ii. Perching
c. Asterias / iii. Water vascular system
d. Torpedo / iv. Electric organ
e. Parrot / v. Presence of shell
f. Dog fish / vi. Placoid scales a. ______________, b. ______________, c. ______________
d. ______________, e. ______________, f. ______________

a. Pila — v. Presence of shell.

b. Cockroach — i. Jointed appendages.

c. Asterias — iii. Water vascular system.

d. Torpedo — iv. Electric organ.

e. Parrot — ii. Perching. …

Each animal in this list illustrates one distinguishing feature drawn from its phylum or class.

• a. Pila, the apple snail, is a mollusc, covered by a calcareous shell — matching v. Presence of shell.
• b. Cockroach is an arthropod, defined by its jointed appendages — matching i. Jointed appendages.
• c. Asterias, the star fish, is an echinoderm, distinguished by its water vascular system — matching iii. Water vascular system.
• d. Torpedo, the electric ray, is a cartilaginous fish (Chondrichthyes) specifically noted for possessing an electric organ — matching iv. Electric organ. …

Method: Phylum-clustering, then attach the characteristic

Rather than matching each animal to a characteristic one pair at a time, first cluster the six animals by phylum/class, recall the single hallmark characteristic already known for each phylum, and read the match off the clusters.

Cluster and recall hallmark per phylum:

• Pila → Mollusca → hallmark: presence of a shell (a calcareous covering).
• Cockroach → Arthropoda → hallmark: jointed appendages (built into the phylum's very name).
• Asterias → Echinodermata → hallmark: water vascular system (the unique tube-feet-powering canal network).
• Torpedo → Chondrichthyes (cartilaginous fish) → hallmark: specifically noted for possessing an electric organ.
• Parrot → Aves → hallmark (in this context): hind limbs adapted for perching on branches.
• Dog fish (Scoliodon) → Chondrichthyes → hallmark: covered in placoid scales, of which its teeth are modified versions.

Read the match directly: a-v (Pila-shell), b-i (Cockroach-jointed appendages), c-iii (Asterias-water vascular system), d-iv (Torpedo-electric organ), e-ii (Parrot-perching), f-vi (Dog fish-placoid scales). …