Why does a hormone act only on specific cell types in an organism and not others?

hormone act only on specific cell types in an organism and not others because the cell have the appropriate receptor for it to bind to the hormone.

Explanation:

Hormones (chemical messengers) relay messages to cells with specific receptors for it only

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

not sure if this what   you'r looking for would be percent composition