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The following diagram shows the human lymphatic system. Identify the labelled sequences A, B, C and D


(a)
A- lymph nodes (primary lymphoid organ), B - thymus (secondary lymphoid organ), C - spleen (secondary lymphoid organ), D - bone marrow (secondary lymphoid organ)
(b)
A - lymph nodes (secondary lymphoid organ), B thymus (primary lymphoid organ), C - spleen secondary lymphoid organ), D - bone marrow (primary lymphoid organ)
(c)
A - lymph nodes (primary lymphoid organ), B - thymus (secondary lymphoid organ), C - spleen (primary lymphoid organ), D - bone marrow (primary lymphoid organ)
(d)A - lymph nodes (primary lymphoid organ), B - thymus (primary lymphoid organ), C - spleen (secondary lymphoid organ), D - bone marrow (secondary lymphoid organ)

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Important Questions on Common Human Diseases
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Match the causative organisms with their diseases
A. | Haemophilus influenzae | 1. | Malignant malaria |
B. | Entamoeba histolytica | 2. | Elephantiasis / Filariasis |
C. | Plasmodium falciparum | 3. | Pneumonia |
D. | Wuchereria bancrofti | 4. | Typhoid |
E. | Salmonella typhi | 5. | Amoebiasis |

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Study the following lists
List-I | List-II | ||
(A) | Pasteurella pestis | (I) | Angular leaf spot of cotton |
(B) | Treponema pallidum | (II) | Amphotericin |
(C) | Mycobacterium bovis | (III) | Actinomycosis of cattle |
(D) | Streptomyces nodosus | (IV) | Syphilis |
(V) | Plague |

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