Question

In which era reptiles were dominant :-

• A. Coenozoic era
• B. Mesozoic era
• C. palaeozoic era
• D. Archaeozoic era

Answer 1

The Correct Option is B

The question asks about the era during which reptiles were the dominant form of life on Earth. To answer this, we need to understand the different geological eras and their significance in the history of life.

1. Mesozoic Era: This era is commonly referred to as the "Age of Reptiles." It spans from about 252 million years ago to 66 million years ago. During the Mesozoic Era, reptiles, including dinosaurs, were the most dominant terrestrial vertebrates. The era is divided into three periods: Triassic, Jurassic, and Cretaceous. It was a time when reptiles diversified greatly, and dinosaurs became the dominant group.
2. Other Eras Explained:
   • Coenozoic Era: Also known as the Cenozoic Era, it began about 66 million years ago and continues to the present. It is called the "Age of Mammals" as mammals and birds became the dominant terrestrial animals following the extinction of the dinosaurs.
   • Palaeozoic Era: This era lasted from about 541 to 252 million years ago. It is known for the Cambrian Explosion, a time of rapid diversification of life forms, but it predates the dominance of reptiles.
   • Archaeozoic Era: Also known as the Archean Eon, it refers to a period from about 4 billion to 2.5 billion years ago. It is characterized by the formation of the Earth's crust and the earliest known life forms, which were simple, single-celled organisms, not reptiles.

Given this information, the correct answer is the Mesozoic Era, as it is the period where reptiles, particularly dinosaurs, flourished and dominated the Earth.