Compare the use of hormones as chemical messengers in plants and animals. Both plants and animals use glands to produce and secrete hormones.

Many of a plant's hormones are secreted into the air, while many of an animal's hormones are secreted into the blood.

Many of a plant's hormones are secreted into intercellular fluid, while many of an animal's hormones are secreted into the blood.

Plants do not use hormones as chemical messengers, but animals do.