Q.Name the orders of Reptilia, giving two examples of each.

[!TLDR] Reptilia's orders include Chelonia (Testudo, Chelone), Crocodilia (Crocodylus, Alligator), Squamata (Hemidactylus, Naja), and Rhynchocephalia (Sphenodon). …

[!ANSWER] Class Reptilia is divided into four principal orders, each with a distinctive body plan.

Order Chelonia (Testudines) — the turtles and tortoises, distinguished by a bony shell fused to the vertebral column and ribs; examples are Testudo (the tortoise) and Chelone (a marine turtle).

Order Crocodilia — large, predominantly aquatic reptiles with an elongated snout and jaws, and a heart with a nearly complete ventricular septum (functionally close to four-chambered); examples are Crocodylus (the crocodile) and Alligator (the alligator).

Order Squamata — by far the largest reptilian order, comprising the lizards and snakes, generally bearing overlapping horny scales; examples include Hemidactylus (the common house lizard) and Naja (the cobra), or, among lizards specifically, Chameleon (noted for colour change and independently mobile eyes) and Draco (the "flying" lizard, which glides using a skin membrane). …

• Forgetting the small, easily-overlooked order Rhynchocephalia, represented by just Sphenodon. …