Question

explain the characteristic features of a prawn

Answer 1

Nervous system is of annelidian type, which consists of brain and ventral nerve cord.

Unisexual i.e. sexes are separate.

Fertilization is internal or external.

They are either oviparous or ovoviviparous.

Development may be direct or indirect.

Sensory organ include antennae, sensory hairs for touch and chemoreceptor, simple and compound eyes, auditory organs (in insects) and statocysts (in crustacean).

Answer 2

there is one pair of appendages in each segment of the body. The prawn carries, in all, nineteen pairs of appendages of which the first five are cephalic, the following eight are thoracic, and the remaining six are abdominal. Each of the first two segments bears a pair of prehensile antennae or feelers.
1.An anterior, rigid, un-jointed cephalothorax and

(2) A posterior, movable, jointed abdomen which can be flexed forwards under the cephalothorax.