The larval stage of a starfish is called Bipinnaria. It is a free-swimming larval stage that uses cilia for movement and eventually develops into the next larval stage, Brachiolaria, before settling down to become an adult starfish.
| List I (Genetic Disorders) | List II (Genetic Alteration) | ||
| A | Down syndrome | I | Gain of X-chromosome |
| B | Klinefelter's syndrome | II | Loss of X-chromosome |
| C | Turner's syndrome | III | Trisomy of chromosome 21 |
| D | Cri du chat syndrome | IV | Deletion of small terminal portion of chromosome 5 |
Choose the correct answer from the options given below: