How do plant and animal hormones primarily differ in their mode of action?

• A. Plant hormones are transported through the bloodstream, while animal hormones are not.
• B. Animal hormones are always proteins, whereas plant hormones are always steroids.
• C. Animal hormones are typically produced in specialized glands, whereas plant hormones are produced in various tissues.
• D. Plant hormones act only on the cells where they are produced, while animal hormones act on distant target cells.

Answer: (C)

Verified step by step guidance

1. Understand that hormones are chemical messengers that regulate various physiological processes in both plants and animals.
2. Recognize that animal hormones are typically produced in specialized endocrine glands, such as the pituitary gland, thyroid gland, and adrenal glands. These hormones are then released into the bloodstream to reach distant target cells.
3. Identify that plant hormones, also known as phytohormones, are produced in various tissues throughout the plant, such as roots, stems, leaves, and flowers. They can act locally or be transported to other parts of the plant.
4. Note that animal hormones can be proteins, peptides, steroids, or amines, and they often have specific target organs or tissues where they exert their effects.
5. Understand that plant hormones, such as auxins, gibberellins, cytokinins, ethylene, and abscisic acid, can influence growth, development, and responses to environmental stimuli, often affecting multiple processes simultaneously.