Hormones that help animals to transform their bodies are called transformation hormones.
1. Prothoracicotropic hormone: Prothoracicotropic hormone is secreted from the intercerebral glands of the brain. It is also called brain hormone. It stimulates the prothoracic gland to secrete hormones.
2. Juvenile hormone: Juvenile hormone is secreted from the corpora alata gland in the nymph stage. It causes growth in the nymph stage.Dr. Siddiq Publications
3. Gonadotropic hormone: Gonadotropic hormone is secreted from the corpora allata gland in adults. It causes penis enlargement.
4. Ecdysone hormone: Ecdysone hormone is secreted from the prothoracic gland. It controls moulting. Dr. Siddiq Publications
5. Growth hormone: On both sides of the pharynx there are corpora cardiata glands. Growth hormone is secreted from this gland. Growth hormone causes the body to grow.
Neurogenic heart
A heart in which heartbeats are generated by ganglions or nerve glands is called a neurogenic heart. For example – grasshopper, cockroach, bee, moth etc.
Pheromones
Chemical substances secreted by the body of female moths that attract male moths to mate are called pheromones. It is also called sex pheromone. For example – grasshopper, cockroach, bee, moth etc. Other pheromones are alarm pheromones, territorial pheromones, trail pheromones, releaser pheromones, primer pheromones, scent pheromones etc.