Question

Which one of the following is called intraspecific chemical messenger?

• A. Pheromones
• B. Prostaglandins
• C. Corticotropin
• D. Catecholamines

Answer 1

Answer: (A)

Pheromones

A. Pheromones are chemicals used by animals of same species for communication. Hence, it is an intraspecific (intra means within same species) chemical messenger.

B. Prostaglandins are the substances synthesised from fatty acids.

C. Corticotropins are steroid hormones secreted by adrenal cortex.

D. Catecholamines are the hormones secreted from adrenal medulla such as adrenaline, noradrenaline, dopamine.

So, the correct answer is 'Pheromones'.