Assertion   :       The tadpoles become giant tadpoles when fed on thiourea.

Reason      :       Thiourea is an antithyroid substance.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Assertion  :       Hormones are similar to enzymes in their action and chemical nature. 

Reason     :     Hormones and enzymes are proteinaceous in nature and act as informational molecules.

Assertion   :       Females have less stature than males after puberty.

Reason      :       This happens because of the presence of hcG in the blood of females.

Assertion   :       Glucagon is said to lower down the blood sugar level.

Reason      :       Glucagon increase the utilisation of glucose in the tissue and the synthesis of liver glycogen.

Assertion   :       Prolactin is also called the ‘Milk ejection hormone’.

Reason      :       Prolactin stimulates the smooth muscle contractions of the mammary glands.

Assertion   :       A tumor of adrenal cortex may cause addison’s disease.

Reason      :       This happens due to over secretion of cortisol by the tumor.

Assertion   :       Diabetes insipidus is marked by excessive urination and too much thirst for water.

Reason      :       Anti-diuretic hormone (ADH) is secreted by the posterior lobe of pituitary gland.

Assertion    :       Anterior lobe of pituitary is attached to hypothalamus by a vein.

Reason       :      This attachment is done through a portal vein.    

Assertion   :       Failure of secretion of thyroid gland hormones from childhood causes cretinism disease.

Reason      :       Thyrotropin hormone maintains BMR and promote growth of body tissues.

Assertion   :       Oxytocin is also known as Anti Diuretic hormone (ADH).

Reason      :       Oxytocin can cause an increase in the renal reabsorption of water.