Question

Read the following statements and select the incorrect ones.
(i) The presence of gill slits in the embryos of all vertebrates support the theory of recapitulation.
(ii) Around 65 million years ago, some land reptiles went back to water and evolved into fish-like reptiles, called Ichthyosaurs.
(iii) Dinosaurs became extinct 200 million years ago.
(iv) The first mammals were like shrews.

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (i) and (iv)

Answer 1

Answer: (B)

The presence of gill slits, post-anal tail, etc. are the embryological evidence that supports the theory of recapitulation, which is also called biogenetic law. During the developmental stages of the human embryo, the development of heart also progresses from a 2 chambered to 3 chambered, and finally develops into a 4 chambered heart. This is evidence of a common ancestry.
Around 200 mya, some of the land reptiles went back to water and evolved into fish-like reptiles, called Ichthyosaurs.
Age of Dinosaurs is called Jurassic period. They evolved during the Triassic period, flourished in the Jurassic period, and got extinct around 65 mya during the Cretaceous period.
The first mammal-like forms prototherians evolved in the Triassic period. The first mammals-like shrews evolved in the Cretaceous period.