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Q. No.Allergic responses are mediated in humans by the antibodies belonging to the class:
1. IgG
2. IgD
3. IgE
4. IgM
Subtopic: Details of Immunity |
94%
From NCERT
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Identify the incorrect statement:
| 1. | The primary lymphoid organs are bone marrow and thymus. |
| 2. | Peyer’s patches are masses of lymphoid tissue in small intestine. |
| 3. | All blood cells excluding lymphocytes are produced in bone marrow. |
| 4. | Thymus regresses in size with age. |
Subtopic: Human Immune System |
83%
From NCERT
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HIV infected person starts suffering from infections that could have been otherwise overcome when the virus has destroyed a significant number of:
1. Helper T lymphocytes
2. Cytotoxic T lymphocytes
3. B lymphocytes
4. Macrophages
1. Helper T lymphocytes
2. Cytotoxic T lymphocytes
3. B lymphocytes
4. Macrophages
Subtopic: AIDS |
92%
From NCERT
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Consider the given two statements:
| Assertion (A): | It is very important that the HIV/AIDS infected persons are not isolated from family and society. |
| Reason (R): | HIV/AIDS is not an infectious disease. |
| 1. | Both (A) and (R) are True and (R) correctly explains Assertion. |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: AIDS |
53%
From NCERT
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When activated under certain conditions, which of the following could lead to oncogenic transformation of the cells?
1. Proto-oncogene
2. Viral-oncogene
3. Jumping genes
4. Pseudogenes
1. Proto-oncogene
2. Viral-oncogene
3. Jumping genes
4. Pseudogenes
Subtopic: Cancer |
88%
From NCERT
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Consider the given two statements:
| Assertion (A): | Techniques of molecular biology may be very helpful in prevention of certain cancers. |
| Reason (R): | Techniques of molecular biology can be applied to detect genes in individuals with inherited susceptibility to certain cancers. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Cancer |
87%
From NCERT
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Consider the given two statements:
| Assertion (A): | Many cancer patients are given substances called biological response modifiers such as α-interferon. |
| Reason (R): | Tumor cells have been shown to avoid detection and destruction by immune system. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Cancer |
62%
From NCERT
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Consider the given two statements:
| Assertion (A): | Cocaine has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy. |
| Reason (R): | Cocaine interferes with the transport of the neuro-transmitter dopamine. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Drugs & Alcohol Abuse |
85%
From NCERT
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Drug abuse is characterised by:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Self-medication |
| II: | Consuming drugs for non-medicinal purposes |
| III: | Use in amounts/frequency that impairs one’s physical, physiological or psychological functions |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Drugs & Alcohol Abuse |
From NCERT
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Consider the given two statements:
| Assertion (A): | Smoking causes oxygen deficiency in the body. |
| Reason (R): | Smoking increases carbon monoxide (CO) content in blood and reduces the concentration of haembound oxygen. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Drugs & Alcohol Abuse |
93%
From NCERT
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