Match the following columns:Column-IColumn-II | vedclass

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(A) The correct matching is as follows:$1$. Bone marrow $(b)$: It is the primary lymphoid organ where all blood cells,including lymphocytes,are produc

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$1-b, 2-a, 3-d, 4-c$

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(A) The correct matching is as follows:$1$. Bone marrow $(b)$: It is the primary lymphoid organ where all blood cells,including lymphocytes,are produced.$2$. Thymus $(a)$: It is a primary lymphoid organ that is quite large at the time of birth but keeps reducing in size with age and becomes very small by the time of puberty.$3$. Spleen $(d)$: It is a large bean-shaped organ which acts as a filter for the blood by trapping blood-borne microorganisms.$4$. Lymph nodes $(c)$: These are small solid structures located at different points along the lymphatic system that trap microorganisms or other antigens present in the lymph and tissue fluid.Therefore,the correct sequence is $1-b, 2-a, 3-d, 4-c$.

Column-$I$	Column-$II$
$1$. Bone marrow	$a$. Large at birth,very small at puberty
$2$. Thymus	$b$. Site of production of all blood cells including lymphocytes
$3$. Spleen	$c$. Traps microorganisms present in the tissue fluid
$4$. Lymph nodes	$d$. Large bean-shaped organ

List-$I$	List-$II$
$(a)$ Amoebiasis	$(i)$ Treponema pallidum
$(b)$ Diphtheria	$(ii)$ Use of sterile food
$(c)$ Cholera	$(iii)$ $DT$ vaccine
$(d)$ Syphilis	$(iv)$ Use of Oral Rehydration Therapy

Column $A$	Column $B$ and $C$
$(A)$ Common Cold	$(ii)$ Rhinovirus,$(r)$ Nasal congestion/reduced olfaction
$(B)$ Pneumonia	$(i)$ Streptococcus pneumoniae,$(s)$ Fingernails turn gray to bluish
$(C)$ $AIDS$	$(iii)$ Retrovirus,$(q)$ Skin blood vessel cancer (Kaposi's sarcoma)
$(D)$ Filariasis	$(iv)$ Filarial worm,$(p)$ Swelling of limbs

Match the following columns:
Column-$I$ Column-$II$
$1$. Bone marrow $a$. Large at birth,very small at puberty
$2$. Thymus $b$. Site of production of all blood cells including lymphocytes
$3$. Spleen $c$. Traps microorganisms present in the tissue fluid
$4$. Lymph nodes $d$. Large bean-shaped organ

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Lymphocytes are seen in large numbers at sites of inflammation because

Match the diseases with their respective pathogens or treatments.
List-$I$ List-$II$
$(a)$ Amoebiasis $(i)$ Treponema pallidum
$(b)$ Diphtheria $(ii)$ Use of sterile food
$(c)$ Cholera $(iii)$ $DT$ vaccine
$(d)$ Syphilis $(iv)$ Use of Oral Rehydration Therapy

The common cold differs from pneumonia in that:

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Match the following columns:Column-$I$Column-$II$$1$. Bone marrow$a$. Large at birth,very small at puberty$2$. Thymus$b$. Site of production of all blood cells including lymphocytes$3$. Spleen$c$. Traps microorganisms present in the tissue fluid$4$. Lymph nodes$d$. Large bean-shaped organ