Q.Name a. A limbless animal
b. A cold blooded animal
c. A warm blooded animal
d. An animal possessing dry and cornified skin
e. An animal having canal system and spicules
f. An animal with cnidoblasts

a. A limbless animal — a snake (reptile) or Ichthyophis (amphibian).

b. A cold blooded animal — Rana (frog).

c. A warm blooded animal — Corvus (crow).

d. An animal with dry, cornified skin — Calotes (garden lizard).

e. An animal having canal system and spicules — Sycon (sponge). …

Each category corresponds to a group with a clearly named example.

• a. A limbless animal: among reptiles, snakes lack limbs altogether; among amphibians, Ichthyophis is explicitly described as a limbless amphibian. Either is a valid limbless example.
• b. A cold blooded animal: Rana, the frog, an amphibian, is poikilothermous (cold-blooded).
• c. A warm blooded animal: Corvus, the crow, a bird, is homoiothermous (warm-blooded).
• d. An animal possessing dry and cornified skin: Calotes, the garden lizard, a reptile, has this kind of protective, water-conserving skin. …

Method: Category-cue mnemonic sentence

Rather than recalling six isolated examples, build one linking sentence that strings all six categories and their examples together in a memorable sequence, using each example to cue the next.

Build the linking chain: "A limbless SNAKE slithers past a cold-blooded FROG sunning itself, which is watched by a warm-blooded CROW perched above a dry-skinned LIZARD (Calotes), near a spiny SPONGE (Sycon) with its canal system, beside a stinging HYDRA waving its cnidoblasts."

Unpack the chain back into the six answers:

• a. A limbless animal → snake (or, equally, Ichthyophis among amphibians).
• b. A cold blooded animal → Rana (frog).
• c. A warm blooded animal → Corvus (crow).
• d. An animal possessing dry and cornified skin → Calotes (garden lizard).
• e. An animal having canal system and spicules → Sycon (sponge).
• f. An animal with cnidoblasts → Hydra (coelenterate). …