Multiple Choice QuestionsAssertion: 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.
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
Being insoluble in water, fats and oils form large immiscible droplets in aqueous media but the enzymes which hydrolyse fats and oils (called lipases) are insoluble in fats and soluble in water. Therefore, lipases can act only on the water adjoining surfaces of fat droplets. Evidently, the larger the surface area of fat droplets, the greater is the action of the lipase on them. We know that the smaller the size of a droplet, the larger is its surface area relative to its mass. Thus lipases can digest fat in significant amounts only when large fat droplets are broken into tiny droplets to form a fine emulsion. This is the reason why emulsification is so necessary for the digestion of fats. Enzyme amylase, on the other hand, is a starch - hydrolysing enzyme which has no role in fat digestion.
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.
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
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