What Is Cavitation?
The filling of the tracheid or xylem vessel with air is cavitation which is also referred to as airlock or... View Article
Latest Posts
What Are The Forms Of Hydrophytes?
Hydrophytes are categorized into the following groups – Type Description Example Free floating hydrophytes freely float in water bodies on... View Article
Are Succulents Xerophytes?
Succulents are a kind of xerophytes. An example of this is Cacti. Such plants retain and store water inside the... View Article
How Do Plants Respond To Water Deficits?
Response of leaves to water stress is by an inward curling or exhibiting a wilted appearance as a result of... View Article
What Are Facultative Sciophytes And Heliophytes?
Light plays several significant ecological roles however, the two most important facets of light are relative light necessities and photoperiodism.... View Article
What is correct to say about the hormone action in humans?
A) Secretion of thymosins is stimulated with ageing B) Glucagon is secreted by β-cells of islets of Langerhans and stimulates... View Article
Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (mostly in the nucleus)?
A) Thyroxine, insulin B) Insulin, glucagon C) Cortisol, testosterone D) Somatostatin, oxytocin Answer: C) Cortisol, testosterone Explanation: Steroid hormones interact with... View Article
Which of the following represents the action of insulin?
A) Decreases blood glucose levels by forming glycogen B) Increases blood glucose levels by stimulating glucagon production C) Increases blood... View Article
Norepinephrine
(i) is released by sympathetic fibers (ii) is released by parasympathetic fibers (iii) increases the heart rate (iv) decreases blood... View Article
Select the option which correctly matches the endocrine gland with its hormone and its function.
A) Corpus luteum – Estrogen – Essential for the maintenance of the endometrium B) Placenta – Estrogen – Initiates secretion... View Article
Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom
A) Thyroid gland – Thyroxine – Lack of iodine in diet results in goitre B) Posterior pituitary – Growth hormone... View Article
A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin. This is the result of
A) oversecretion of pars distalis B) cancer of the thyroid gland C) low secretion of growth hormone D) deficiency of... View Article
Fight or flight reactions cause activation of
A) the kidney, leading to suppression of renin-angiotensin-aldosterone pathway B) the parathyroid glands, leading to increased metabolic rate C) the... View Article
Identify the hormone with its correct matching of source and function
A) Melatonin - pineal gland, regulates the normal rhythm of the sleep-wake cycle B) Oxytocin - posterior pituitary, growth and... View Article
A chemical signal that has both endocrine and neural roles is
Q. A chemical signal that has both endocrine and neural roles is A) cortisol B) epinephrine C) calcitonin D) melatonin... View Article
Which one of the following hormones though synthesised elsewhere, is stored and released by the master gland?
A) Melanocyte stimulating hormone B) Prolactin C) Luteinising hormone D) Antidiuretic hormone Answer:D) Antidiuretic hormone Explanation: Antidiuretic hormone (ADH) or... View Article
Which one of the following hormones is not involved in sugar metabolism?
A) Glucagon B) Insulin C) Aldosterone D) Cortisone Answer: C) Aldosterone Explanation: Aldosterone is a mineralocorticoid released from the adrenal cortex.... View Article
The amino acid tryptophan is the precursor for the synthesis of
A) cortisol and cortisone B) estrogen and progesterone C) thyroxine and triiodothyronine D) melatonin and serotonin Answer:D) melatonin and serotonin... View Article
Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?
A) Relaxin – Inhibin B) Aldosterone – Atrial Natriuretic Factor C) Insulin – Glucagon D) Parathormone – Calcitonin Answer:A) Relaxin... View Article
The posterior pituitary gland is not a ‘true’ endocrine gland because
A) it only stores and releases hormones B) it is provided with a duct C) it secretes enzymes D) it... View Article
