Free Chemical Coordination and Hormones MCQs with Answers
257 Chemical Coordination and Hormones MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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- A. Brain
- B. Neck
- C. Stomach
- D. Above kideys
Explanation: The pineal gland lies deep within the brain, near the roof of the third ventricle, where it releases melatonin.
Correct answer: Brain- A. Central nervous system
- B. Parasympathetic nervous system
- C. Sympathetic nervous syetem
- D. Autonomous nervous system
Explanation: Smooth muscle, cardiac muscle and glands are controlled involuntarily by the autonomic nervous system.
Correct answer: Autonomous nervous system- A. Cortisol
- B. Adrenaline
- C. ACTH
- D. All of these
Explanation: Cortisol, adrenaline and ACTH all participate in the body's stress response: ACTH stimulates cortisol release, while adrenaline produces…
Correct answer: All of these- A. Glut 1&3
- B. Glut 2
- C. Glut 1
- D. Glut 4
Explanation: GLUT4 is insulin-dependent and moves to the cell membrane in response to insulin, especially in skeletal muscle and adipose tissue.
Correct answer: Glut 4- A. More anti-diuretic hormone
- B. Lesser anti-diuretic hormone
- C. Active functioning of pancreas
- D. Inactivity of pituitary gland
Explanation: Antidiuretic hormone, or ADH, increases water reabsorption by making the collecting ducts more permeable to water, so more water returns…
Correct answer: More anti-diuretic hormone- A. Casein
- B. Trypsin
- C. Oxytocin
- D. Keratin
Explanation: Oxytocin is a peptide hormone released from the posterior pituitary that promotes uterine contractions and milk ejection.
Correct answer: Oxytocin- A. Abscisic acid
- B. Cytokinin
- C. Ethylene
- D. Gibberellin
Explanation: Gibberellins can induce parthenocarpy, the development of fruit without fertilisation, often producing seedless fruits.
Correct answer: Gibberellin- A. Gibberellins
- B. Abscisins
- C. Auxins
- D. Cytokinins
Explanation: Epinasty, such as downward bending of a leaf, commonly results from unequal auxin distribution that causes greater growth on one side of…
Correct answer: Auxins- A. Positive phototropism and negative geotropism
- B. Negative phototropism and positive geotropism
- C. Negative tactic movement and positive tropic movement
- D. Positive geotropism of stem and roots
Explanation: Roots grow away from light, showing negative phototropism, and grow in the direction of gravity, showing positive geotropism.
Correct answer: Negative phototropism and positive geotropism- A. Myxedema
- B. Cretinism
- C. Goiter
- D. Exopthalmic goiter
Explanation: Low secretion of thyroid hormones in an adult causes myxedema, producing reduced metabolic activity and symptoms such as lethargy and…
Correct answer: Myxedema- A. Protein
- B. Amino acid derivative
- C. Polypeptide
- D. Steroid
Explanation: Insulin and glucagon are peptide hormones made of amino-acid chains, so they are classified broadly as proteins.
Correct answer: Protein- A. Anterior pituitary
- B. Median pituitary
- C. Posterior pituitary
- D. None of these
Explanation: Melanocyte-stimulating hormone is produced mainly by the pars intermedia, or intermediate lobe, of the pituitary gland.
Correct answer: Median pituitary- A. Undersecretion of thyroxin
- B. Overproduction of thyroxin
- C. Undersecretion of corticosteroids
- D. Overproduction of corticosteroids
Explanation: Graves' disease is an autoimmune condition in which antibodies stimulate thyroid-stimulating hormone receptors, causing excessive thyroid…
Correct answer: Overproduction of thyroxin- A. Stomach
- B. Liver
- C. Pancreas
- D. Duodenum
Explanation: Secretin is released by S cells in the duodenal lining when acidic chyme enters from the stomach.
Correct answer: Duodenum35. All of the following are similarities between nervous and endocrine system except:_____________?
- A. Produce chemical messengers
- B. Release chemical messengers in extracellular space
- C. Homestatic in function
- D. Having slow but prolonged effects
Explanation: Both nervous and endocrine systems coordinate body functions using chemical messengers released into extracellular spaces and help…
Correct answer: Having slow but prolonged effects- A. Gibberellins
- B. Cytokinins
- C. Auxins
- D. Abscisic Acid
Explanation: Gibberellins stimulate the production of hydrolytic enzymes, such as amylase, in germinating barley seeds.
Correct answer: Gibberellins- A. Gibberellins
- B. Cytokinins
- C. Auxins
- D. Abscisic Acid
Explanation: Abscisic acid promotes leaf senescence and helps the plant enter stress-related resting states, while cytokinins generally delay…
Correct answer: Abscisic Acid- A. Gibberellins
- B. Cytokinins
- C. Auxins
- D. Ethene.
Explanation: Gibberellins can promote flowering in many long-day plants and therefore oppose abscisic acid, which generally suppresses growth and…
Correct answer: Gibberellins39. Which of the following is antagonist to Auxin in terms of promotion of stem growth______________?
- A. Gibberellins
- B. Cytokinins
- C. Abscisic Acid
- D. none of these.
Explanation: Abscisic acid inhibits cell growth and promotes dormancy, whereas auxin promotes cell elongation and stem growth, so they act…
Correct answer: Abscisic Acid- A. White
- B. Red
- C. Blue
- D. Green
Explanation: In some long-day plants, gibberellin treatment can replace the flowering effect normally produced by a red-light-dependent long-day…
Correct answer: Red