Biology : Chemical Coordination and Integration

Assertion : Hormone calcitonin has antagonistic effect to that of parathormone.

Reason : Calcitonin decreases blood calcium level while parathormone increases blood calcium level.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

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.

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 $\mathrm{\alpha }$-cells of Langerhans

• It acts antagonistically to insulin

• It decreases blood sugar level

• The gland responsible for its secretion is heterocrine gland.

Assertion: Pituitary is attached to hypothalamus by a vein.

Reason: This attachment hypophysial portal vein.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion: Rabies is acute infectious disease of warm blooded mammals characterised by
involvement of central nervous system resulting in paralysis and finally death.

Reason: This is caused due to neurotropic filterable bacteria in saliva of rabid animals.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Aldosterone is a steroid hormone and is important in the control of sodium and potassium ion concentration in mammals.

Reason : It upgrades sodium ion concentration in the ECF by promoting reabsorption of sodium ions from renal tubules and excretion of potassium ions in urine.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Which one of the following four secretions is correctly matched with its source, target and nature of action?

• Secretion	Source	Target	Action
  Gastrin	Stomach lining	Oxyntic cells	Production of HCl

• Inhibin

  Sertoli cells

  Hypothalamus

  Inhibition of secretion of gonadotropin releasing hormone

• Enterokinase

  Duodenum

  Gall bladder

  Release of bile juice

• Atrial Natiuretic Factor (ANF)

  Sinu atrial node (SAN) M- cells of Atria

  Juxta- glomerular apparatus (JGA)

  Inhibition of release of renin

Tadpoles of frog can be made to grow as giant sized tadpoles, if they are

• administered antithyroid substance like thiourea

• administered large amounts of thyroxine

• reared on a diet rich in egg yolk

• reared on a diet rich in both egg yolk and glucose.

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 - secretes 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