- A$C_3$
- ✓$C_4$
- CBoth $(a)$ and $(b)$
- DNone of these
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$(i)$ Leucocytes disintegrate in the spleen and liver.
$(ii)$ $RBC, WBC$ and blood platelets are produced by bone marrow.
$(iii)$ Neutrophils bring about destruction and detoxification of toxins of protein origin.
$(iv)$ The important function of lymphocytes is to produce antibodies
$X$ $-$ $Y$
$I.$ the chromosome number is reduced to haploid state
$II.$ the amount of $DNA$ is reduced to haploid state
The correct option is
$(i)$ All the cells of the epithelium are held together with little intercellular materials.
$(ii)$ In almost all animal tissues specialized junction provide both structural and functional link between its individual cells.
$(iii)$ Tight junctions help to stop substances from leaking across a tissue.
$(iv)$ Adhering junctions provide cementing to keep neighbouring cells together.
$(v)$ Gap junctions provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.