Which of the following are animal hormones?

(A) Auxin
(B) Adrenaline
(C) Thyroxine
(D) Oestrogen

Choose the correct answer from the options given below:

(B), (C) and (D) only

The correct answer is Option (3) → (B), (C) and (D) only

Analyzing the Options

• (A) Auxin: This is a plant hormone (phytohormone) produced in the stem tips and roots. It promotes cell elongation and is responsible for phototropism (growing toward light).
• (B) Adrenaline: This is an animal hormone produced by the adrenal glands. It is often called the "fight-or-flight" hormone because it prepares the body for quick action during stress.
• (C) Thyroxine: This is an animal hormone produced by the thyroid gland. It plays a vital role in regulating the body's metabolic rate, heart function, and digestive functions.
• (D) Oestrogen: This is an animal hormone primarily produced in the ovaries. It is responsible for the development and regulation of the female reproductive system and secondary sex characteristics.