Select the correct option about functions of thymus gland–
Play a major role in the development of the immune system.
Provides pigmentation to the skin.
Active in emergency conditions.
Regulation of basal metabolic rate
The Thymus gland is derived from the Endoderm and is a lobular structure located between the lungs behind the sternum on the ventral side of the aorta which plays a major role in the development of the immune system. Hence, option 1 is the correct answer.
Explanation for the incorrect options :
Option 2 is incorrect because the Pineal gland provides pigmentation to the skin.
Option 3 is incorrect because Adrenal gland adrenaline and noradrenaline are active in emergency conditions. Therefore, it is also called an emergency hormone.
Option 4 is incorrect because the Thyroid gland regulates the basal metabolic rate