Which organism is NOT a member of the class Reptilia?

• A. Turtle
• B. Frog
• C. Lizard
• D. Crocodile

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the classification system in biology. Organisms are classified into hierarchical categories such as kingdom, phylum, class, order, family, genus, and species. The class 'Reptilia' includes reptiles, which are cold-blooded vertebrates with scales or scutes.
2. Step 2: Identify the characteristics of organisms in the class Reptilia. Reptiles typically lay eggs, have lungs for breathing, and are ectothermic (rely on external sources for body heat). Examples include turtles, lizards, crocodiles, and snakes.
3. Step 3: Examine the given organisms: Turtle, Frog, Lizard, and Crocodile. Compare their biological traits to the characteristics of reptiles. For instance, turtles, lizards, and crocodiles have scales and are ectothermic, fitting the description of reptiles.
4. Step 4: Analyze the frog's traits. Frogs belong to the class Amphibia, not Reptilia. Amphibians are characterized by their ability to live both in water and on land, smooth skin without scales, and a life cycle that includes metamorphosis (e.g., tadpole to adult frog).
5. Step 5: Conclude that the frog is not a member of the class Reptilia based on its classification in Amphibia and its distinct biological traits.