Question

The echinoderms have ............................. development.

• A. Retrogressive
• B. Direct
• C. Indirect
• D. Parthenogenetic

Answer 1

The correct option is A Retrogressive

Most of the organisms undergo metamorphoses which is progressive. The larvae possess primitive characters. When the adult develops from the larvae, there is development of advanced characters. This type of metamorphosis is observed in insects. In retrogressive metmaorphosis, the larvae have advanced features. But when the larvae develops into adult, there is loss of the advanced features and replacement with primitive features. The larvae possess advanced characters, such as locomotory organs, and sense organs. There is loss of this features when the adult is formed. This type of metamorphosis is called retrogressive. In echinoderms also, the larvae are more advanced as compared to their adult forms and hence, the development is regressive.
Thus, the correct answer is option A.