Free Coordination and Control MCQs with Answers

• A. Biogenic amines only
• B. Proteins, steroids and biogenic amines
• C. Proteins only
• D. Steroids only

Explanation: Hormones are chemical messengers produced by the ductless glands (sometimes by neurons) and transported in the circulation to target…

• A. Cortisone
• B. Cortisol
• C. Corticosterone
• D. Deoxycorticosterone

Explanation: Adrenal glands or (suprarenal glands) are two triangular endocrine glands, each of which covers the superior surface of a kidney.

• A. Adrenaline
• B. Glucagon
• C. Gastrin
• D. Thyroxine

Explanation: The correct answer is Adrenaline. This hormone is crucial during stressful situations, such as feeling the tremors of an earthquake, as it…

• A. Increases blood glucose level by stimulating glucagon production
• B. Decreases blood glucose levels by forming glycogen
• C. Increases blood glucose levels by promoting cellular uptake of glucose
• D. Increases blood glucose levels by hydrolysis of glycogen

Explanation: Insulin is a peptide hormone, secreted by the b cells of the islets of Langerhans in the pancreas, that promotes the uptake of glucose by…

• A. Cancer of the thyroid gland
• B. Oversecretion of pars distalis
• C. Deficiency of iodine in diet
• D. Low secretion of growth hormone

Explanation: Iodine is needed for the synthesis of T3 and T4. Iodine binds to the tyrosine residues in thyroglobulin, which is then hydrolysed into…

• A. Oxytocin - posterior pituitary - growth and maintenance of mammary glands
• B. Melatonin - ­pineal gland - regulates the normal rhythm of sleepwake cycle.
• C. Progesterone - corpus luteum-stimulation of growth and activities of female secondary sex organs
• D. Atrial natriuretic factor - ventricular wall - increases the blood pressure.

Explanation: Option C is correct. Melatonin is a hormone produced by the brain's pineal gland that primarily regulates circadian rhythms, the body's…

• A. Epinephrine
• B. Cortisol
• C. Melatonin
• D. Calcitonin

Explanation: The hormones epinephrine and norepinephrine are secreted from the adrenal medulla.

• A. Hyposecretion of thyroid gland
• B. Hypersecretion of thyroid gland
• C. Hyposecretion of adrenal gland
• D. Hypersecretion of adrenal gland

Explanation: Graves' disease is characterized by secretion of excessive amount of thyroid hormone (T4 and T3). It is an autoimmune disease.

• A. Corpus cardiacum
• B. Corpus luteum
• C. Corpus allatum
• D. Pineal gland

Explanation: The corpus luteum is a temporary endocrine gland in human females. It is formed after the follicle ruptures and LH transforms this…

• A. Thyroxin
• B. Cortisol
• C. Calcitonin
• D. None of these

Explanation: Antagonistic hormones have opposite effects on one another.The hormones antagonistic to insulin are glucagon and cortisol, adrenaline, and…

• A. Centrosome
• B. Nucleus
• C. Mitochondria
• D. Golgi apparatus

Explanation: Option A: Neurons cannot undergo division because they do not have centrosomes.

• A. Gibberellins
• B. Ethylene
• C. Cytokinins
• D. Auxins
• E. Abscisic acids

Explanation: Auxins are plant hormones that play a crucial role in regulating plant growth and development.

• A. Oxytocin
• B. Parathormone
• C. Glucagon
• D. Insulin
• E. Cortisol

Explanation: Diabetes mellitus is a metabolic disorder characterized by high levels of glucose in the blood due to the inability of the body to produce…

• A. Ethene
• B. Gibberellins
• C. Cytokinins
• D. Abscisic acid

Explanation: Stomatal closure is a common adaptation response of plants to the onset of drought condition

• A. Somatotropin hormone
• B. Thyroid stimulating hormone
• C. Antidiuretic hormone
• D. Gonadotrophic hormone

Explanation: ADH is produced by the hypothalamus in the brain and stored in the posterior pituitary gland at the base of the brain.

• A. ADH
• B. Thyroxin
• C. Cortisone
• D. Insulin

Explanation: Steroid hormones are fat-soluble molecules made from cholesterol. Among these are the three major sex hormone groups: estrogens…

• A. Nervous stimulation
• B. Chemical stimulation
• C. Both chemical and nervous stimulation
• D. None of the given options

Explanation: The diameter of any given vessel may also change frequently throughout the day in response to neural and chemical signals that trigger…

• A. Adrenaline
• B. Non adrenaline
• C. Thyroxin
• D. Insulin

Explanation: Adrenaline triggers the body's fight-or-flight response. This reaction causes air passages to dilate to provide the muscles with the…

• A. Auxins
• B. Gibberellins
• C. Abscisic acid
• D. Cytokinins
• E. All of the above

Explanation: Phytohormones are critical for plant growth, development, and responses to stimuli.

• A. Pituitary
• B. Adrenal gland
• C. Thyroid
• D. Parathyroid
• E. Pancreas

Explanation: The adrenal glands are often referred to as the "glands of emergency" because they play a crucial role in the body's stress response.