Zoology MCQs for NEET — Practice Questions with Answers

Follicle-stimulating hormone (FSH) is a gonadotropin, a glycoprotein polypeptide hormone. FSH is synthesized and secreted by the gonadotropic cells of the anterior pituitary gland, and regulates the development, growth, pubertal maturation, and reproductive processes of the body.

Insulin is the hormone that promotes glycogenesis, the process of converting glucose to glycogen for storage in the liver. Insulin helps lower blood glucose levels by facilitating the uptake of glucose into cells and stimulating glycogenesis. Therefore, the correct option is o2.

The correct path of Libido expression is: Leydig’s cell -----> Androgen -----> CNS -----> Libido. Leydig cells in the testes produce androgens (mainly testosterone), which then act on the central nervous system (CNS) to influence sexual drive or libido.

The corpus luteum is not considered a primary endocrine gland. Primary endocrine glands include the adrenal medulla, parathyroid gland, thymus, etc., which have the primary function of secreting hormones. The corpus luteum is a temporary endocrine structure involved in the menstrual cycle and early pregnancy but not classified as a primary endocrine gland.

Prolactin is the hormone responsible for milk formation in the mammary glands. It stimulates the mammary glands to produce milk (lactation) after childbirth.

The Atrial Natriuretic Factor (ANF) is secreted by the atrial wall of the heart. When the atria of the heart are stretched due to increased blood volume, they release ANF to reduce blood pressure and fluid levels by promoting the excretion of sodium and water by the kidneys.

The full form of ANF is Atrial Natriuretic Factor. It is a hormone involved in the regulation of blood pressure by promoting the excretion of sodium (natriuresis) and water from the kidneys.

The Juxta Glomerular Apparatus (JGA) secretes erythropoietin, a hormone that stimulates the formation of red blood cells (RBCs) in the bone marrow. This is crucial for maintaining adequate levels of RBCs and ensuring sufficient oxygen transport throughout the body.

T4, or Thyroxine, is not a secondary messenger. Secondary messengers are molecules that relay signals received by receptors to target molecules inside the cell. Examples include AMP (Adenosine Monophosphate), IP3 (Inositol Triphosphate), and Ca²⁺ (Calcium ions). Thyroxine is a primary hormone produced by the thyroid gland and does not function as a secondary messenger.

PTH, or Parathyroid Hormone, is called the hypercalcemic hormone because it increases the level of calcium in the blood. It does this by stimulating the release of calcium from bones, increasing the absorption of calcium in the intestines, and promoting the reabsorption of calcium in the kidneys. Thyroxine (o2) and TCT (Calcitonin, o3) are not involved in increasing blood calcium levels.