Assertion: Mylein sheath insulates the nerve fibre and prevents its depolarisation.

Reason: Nerve impulses are conducted more rapidly in non - myelinated nerve fibres than in myelinated ones.

• 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: Frog can change its colour, according to its surroundings.

Reason: It is a way of mimicry to capture preys

• 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: Less iodine intake causes goitre.

Reason: Less iodine in body decreases thyroxine secretion

• 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: Excess Mn in soil, can adversely decrease Mg, Fe and Cu concentrations in the soil.

Reason: Mn increases rate of photosynthesis, thereby increasing absorption of Mg, Fe and Ca from soil.

• 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: In proximal convoluted tubule glomerular filtrate becomes hypertonic to blood plasma.

Reason: HCO₃^- is absorbed only in the proximal convoluted tubule.

• 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: Complexity of classification increases from kingdom to species.

Reason: Common characters increase from kingdom to species.

• 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: Emulsification is necessary for the digestion of fats.

Reason: After fats are emulsified, the action of enzyme amylase gets significantly increased.

• 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: In jaundice, the skin and mucous membranes assume a yellowish hue

Reason: Yellow pigment bilirubin imparts pale yellow colour to blood plasma

• 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.

39.

Assertion: No taste sensation is evoked when drop of distilled water is put on human tongue.

Reason: Man does not possess taste buds for tasting water.

• 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: Oxytocin is also known as Antidiuretic hormone (ADH).

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

• 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