Assertion(A):
Active immunity is slow and takes time to show its full effect.
Reason(R):
Active immunisation leads to formation of antibodies and memory B-cells and T-cells.
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: Â Active & Passive Immunity |
From NCERT
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| Assertion(A): | Plasmodium falciparum causes malignant malaria which, if not treated, can be fatal. |
| Reason(R): | Plasmodium falciparum directly resides in nervous tissue. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Common Cold & Malaria Introduction |Â Treatment & Life Cycle of Malaria |
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| Assertion(A): | Nowadays. allergies and asthma are more common in children of metro cities. |
| Reason(R): | Lowered immunity and increased sensitivity to the environment due to prevalent life style and city pollution are responsible factors. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Allergies & Autoimmunity |
 89%
From NCERT
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| Assertion(A): | Metastatic cells have lost the property of contact inhibition. |
| Reason(R): | Oncogenes in normal cells promote the secretion of growth factors. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Cancer |
From NCERT
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| Assertion(A): | During HIV infection, the patient becomes immuno-deficient. |
| Reason(R): | HIV Virus attacks helper T-lymphocytes and decreases their cell count. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â AIDS |
 92%
From NCERT
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| Assertion(A): | Techniques like CT and MRI are very useful in detection of cancers of internal organs. |
| Reason(R): | Techniques of molecular biology can also be used to detect diseases having genetic susceptibility. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Cancer |
 79%
From NCERT
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| Assertion(A): | Adolescence is a very vulnerable phase of mental and psychological development of an individual. |
| Reason(R): | Addiction to drugs or alcohol is very common during adolescence. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Drugs & Alcohol Abuse |
 50%
From NCERT
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| Assertion(A): | Nicotine in tobacco is a sympathomimetic compound. |
| Reason(R): | Nicotine stimulates the release of adrenaline into blood. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Drugs & Alcohol Abuse |
 66%
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| Assertion(A): | With time, there is greater intake and addiction of drugs among addicts. |
| Reason(R): | With repeated use of drugs, tolerance level of receptors declines. |
| 1. | Both (A) and (R)are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Drugs & Alcohol Abuse |
 59%
From NCERT
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| Assertion(A): | Use of cocaine causes a temporary sense of euphoria. |
| Reason(R): | It has a stimulatory effect on central nervous system by promoting release of GABA |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Common Cold & Malaria Introduction |
From NCERT
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