The endocrine gland of insects, which secretes the juvenile hormone, is

Ecdysone is secreted from

The hind pair of wings of mosquitoes are represented by

The Indian fresh water prawn is

Starfish belongs to the phylum

In the life cycle of mosquito, comma shaped stage is

Butterflies belong to the order

Piercing and sucking mouth parts are found in

Ephyra larva of Aurelia bears

In arthropoda, head and throrax are often fused to form cephalothorax. But in which of the following classes, the body is divided into head , thorax and abdomen?