Sea fish are good source of

  • iron

  • iodine

  • potassium

  • all the above

Which of the following is a prolactin-inhibiting hormone secreted in the hypothalamus ?

  • Serotonin 
  • Dopamine
  • Epinerphrine
  • Histamine 

All hypophysiototropic hormones are peptides except

  • corticotropin releasing hormone
  • growth hormone
  • somatostatin
  • prolactin release inhibiting hormone.

Sella Turcica is found 

  • in bones
  • in joints
  • nearby pituitary
  • nearby thyroid

Which one of the following four glands is correctly matched with the accompanying description?

  • Thyroid - hyperactivity in young children causes cretinism
  • Thymus - starts undergoing atrophy after puberty
  • Parathyroid - secrets parathormone which promotes movement of calcium ions from blood into bones during calcification
  • Pancreas - Delta cells of the Islets of Langerhans secrete a hormone which stimulates glycolysis in liver

Which of the following match is correct
     Hormone                       Effect

  • Oxytocin                    Milk ejection hormone
  • Glucagon                    Decreases blood sugar level
  • Adrenaline                  Decreases heart rate
  • Thyroxine                  Decreases BMR    

Which of the following statements regarding glucagon is false?

  • It is secreted by α-cells of Langerhans.
  • It acts antagonistically to insulin. 
  • It decreases blood sugar level.
  • The gland responsible for its secretion is heterocrine gland

A patient of diabetes mellitus excretes glucose in urine even when he is kept in a carbohydrate free diet. It is because:-

  • fats are catabolised in adipose tissues to form glucose

  • amino acids are catabolised in kidney to form glucose

  • amino acids are discharged in blood stream from liver

  • glycogen from muscles is released in blood stream

What is the effect of GnRH produced by hypothalamus?

  • Stimulates the synthesis and secretion of androgens
  • Stimulates secretion of milk in mammary glands
  • Stimulates foetal ejection reflex
  • Stimulates synthesis of carbohydrates from non-carbohydrates in liver

Catecholamine in a normal person induces

  • intense salivation

  • alertness
  • decrease in heart beat
  • excessive urination

Match the source gland with its respective hormone and function and select the correct option.
       Source gland             Hormone          Function
     of Langerhans
  •   Anterior pituitary         Oxytocin          Contraction of uterine muscles

  • Anterior pituitary          Vasopressin      Induces reabsorption of water in nephron 

  • Thymus                      Thymosin          Proliferation of T-lymphocytes 

  •  α-cells of islets           Glucagon           Uptake of glucose into the cell.

Select the correct statement about hormones and their actions.

  • Parathyroid hormone increases K+ absorption of the body.

  • Insulin and glucagon helps to maintain blood sugar levels.

  • Old aged people have weak immunity due to increased activity of thymus.

  • Osteoporosis in women occurs due to increased levels of oestrogens.

Gonadotropin releasing hormone is transferred to anterior pituitary by

  • left coronary artery
  • hypophyseal portal veins
  • axons of neurosecretory cells
  • nuclei of hypothalamus.

Which of the following represents the action of insulin?

  • Increases blood glucose level by stimulating glucagon production.

  • Decreases blood glucose level by forming glycogen. 

  • Increases blood glucose level by promoting cellular uptake of glucose.

  • Increases blood glucose level by hydrolysis of glycogen. 

Achondroplasia is a disease related with the defect in the formation of 

  • membrane

  • cartilage

  • mucosa

  • none of these

Which one of the following pairs is the matching pair of the part and the hormone it secretes?

  • Anterior pituitary - Thyroxine
  • Alpha cells of pancreas - Glucagon
  • Thyroid - Epinephrine
  • Stomach epithelium - Secretin

In the homeostatic control of blood sugar level, which organs function as modulator and effector respectively?

  • Liver and islet of Langerhans

  • Hypothalamus and liver

  • Hypothalamus and islet of Langerhans

  • Islet of Langerhans and hypothalamus

The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

  • calcitonin 

  • prolactin

  • adrenaline

  • melatonin

A gland called ‘Clock of ageing’ that gradually reduces and degenerates in ageing is

  • thyroid

  • thymus
  • parathyroid
  • pituitary

In a child of 15 years age, plasma calcium level is diagnosed below optimum level.Which organ is malfunctioning?

  • Thyroid gland

  • Liver

  • Parathyroid

  • Posterior lobe of pituitary

Assertion             :       Aldosterone increases the volume of blood and other extracellular fluids.

               

Reason     :     The secretion of aldosterone is stimulated by a fall in the circulating volume of blood.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion  :     Adrenal cortex can be removed without causing death.          

Reason     :     Adrenal cortex is not vital for survival.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       FSH is also known as interstitial cell stimulating hormone.

Reason      :       It is because of the fact that FSH stimulates the interstitial cells of testis.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Failure of secretion of somatotropin from an early age causes dwarfism in the patient.

Reason      :       Somatotropin hormone stimulates the body growth and elongation of long bones.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Thyroxine controls the metabolism of the following Macromolecules except

  • Carbohydrates

  • Fats

  • Proteins

  • Nucleic acids

Assertion   :       Oxytocin is also known as Anti Diuretic hormone (ADH).

Reason      :       Oxytocin can cause an increase in the renal reabsorption of water.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Failure of secretion of thyroid gland hormones from childhood causes cretinism disease.

Reason      :       Thyrotropin hormone maintains BMR and promote growth of body tissues.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       The tadpoles become giant tadpoles when fed on thiourea.

Reason      :       Thiourea is an antithyroid substance.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion  :       Hormones are similar to enzymes in their action and chemical nature. 

Reason     :     Hormones and enzymes are proteinaceous in nature and act as informational molecules.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion   :       Females have less stature than males after puberty.

Reason      :       This happens because of the presence of hcG in the blood of females.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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  • 2
  • 3
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Practice Zoology Quiz Questions and Answers