Consider the following statements 1. Dinosaurs roamed the earth during the Mesozoic era. 2. All Dinosaurus and other reptiles such as Ichthyosaurus and Pterosaurus became extinct due to unknown reasons in Triassic period. Which of the statements given above is/are correct ?

Statement 1 is correct as dinosaurs roamed the Earth during the Mesozoic era, which is often referred to as the 'Age of Reptiles' and includes the Triassic, Jurassic, and Cretaceous periods [1]. Statement 2 is incorrect because dinosaurs did not become extinct during the Triassic period; rather, they first appeared in the Triassic and rose to dominance after the End-Triassic extinction event [5]. The mass extinction of non-avian dinosaurs, along with pterosaurs and large marine reptiles like plesiosaurs, occurred at the end of the Cretaceous period (approximately 66 million years ago) due to the Cretaceous-Paleogene (K-Pg) extinction event, likely caused by an asteroid impact and volcanic activity [4][t2]. While some reptiles were affected by the End-Triassic event, dinosaurs survived and flourished until the end of the Mesozoic [t1][t5].

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 3: Geological Time Scale The Evolution of The Earths Surface > 3. Geological Time Scale – The Evolution of The Earth's Surface > p. 42
2. [4] https://www.nps.gov/subjects/fossils/mass-extinctions-through-geologic-time.htm
3. [5] https://en.wikipedia.org/wiki/List_of_vertebrate_fauna_of_the_Maastrichtian_stage
4. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 3: Geological Time Scale The Evolution of The Earths Surface > 3.4. Phanerozoic Eon (550 mya to present) > p. 44