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Q77 (IAS/1994) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Genetics and evolution Answer Verified

The first bird is believed to have appeared on the surface of the earth

Result
Your answer: —  Â·  Correct: C
Explanation

Fossil and geologic summaries place the appearance of the earliest recognized birds in the Late Jurassic, about 150 million years ago. Compiled timelines in textbook material explicitly list "150 | Jurassic First Birds," indicating the first birds emerged around that time in the Mesozoic era [1]. Paleontological sources identify Archaeopteryx — widely regarded as the earliest true bird or a bird-like dinosaur — at roughly 150 million years old, reinforcing the Jurassic timing for the origin of avian forms [2]. Together, these book and museum-backed web references support the conclusion that the first birds appeared about 150 million years ago, making option 3 the best choice.

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. [2] https://www.nhm.ac.uk/discover/what-were-the-first-birds-like.html
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