Hormones thyroxine, adrenaline and the pigment melanin are formed from tyrosine. Tyrosine is transformed into dopa through the enzyme tyrosinase. Then through different metabolic pathways it produces thyroxine, adrenaline, melanin etc.

Correct Option: A

Hormones thyroxine, adrenaline and the pigment melanin are formed from tyrosine. Tyrosine is transformed into dopa through the enzyme tyrosinase. Then through different metabolic pathways it produces thyroxine, adrenaline, melanin etc.

Prolactin is a proteinaceous hormone released by anterior lobe of pituitary. Prolactin supplements the action of gonadal hormones in stimulating the growth and activity of female mammary gland during pregnancy and lactation. Oxytocin released by the posterior lobe of pituitary gland, is important for the mechanism of ejection of milk from the mammary glands due to sucking of breasts by infant. Progesterone, released by corpus luteum brings about pregnancy changes such as uterine growth, implantation of embryo etc. Relaxin is a proteinaceous hormone secreted by corpus
luteum towards the end of gestation period for loosening and softening of pelvic ligaments, relaxing of uterus for easing parturition.

Correct Option: B

Prolactin is a proteinaceous hormone released by anterior lobe of pituitary. Prolactin supplements the action of gonadal hormones in stimulating the growth and activity of female mammary gland during pregnancy and lactation. Oxytocin released by the posterior lobe of pituitary gland, is important for the mechanism of ejection of milk from the mammary glands due to sucking of breasts by infant. Progesterone, released by corpus luteum brings about pregnancy changes such as uterine growth, implantation of embryo etc. Relaxin is a proteinaceous hormone secreted by corpus
luteum towards the end of gestation period for loosening and softening of pelvic ligaments, relaxing of uterus for easing parturition.

According to the immunity theory ageing occurs due to the loss of power of defence against the invasion of germs and pathogens. The process starts with the gradual atrophy and disappearance of the thymus gland during middle age.

Correct Option: C

According to the immunity theory ageing occurs due to the loss of power of defence against the invasion of germs and pathogens. The process starts with the gradual atrophy and disappearance of the thymus gland during middle age.

Insulin is a hormone secreted by the b-cells of pancreas and it controls the sugar level in blood.

Correct Option: C

Insulin is a hormone secreted by the b-cells of pancreas and it controls the sugar level in blood.

Mammalian corpus luteum produces progesterone. It is essential for the continuation of pregnancy and it also stimulates acini glands.

Correct Option: B

Mammalian corpus luteum produces progesterone. It is essential for the continuation of pregnancy and it also stimulates acini glands.