MCQ
Which of the glands is often referred in relation with AIDS
- AThyroid
- ✓Thymus
- CAdrenal
- DPancreas
(b)Thymus is an important gland in the early part of human life and forms $T$-lymphocytes. It is referred in relation to AIDS because AIDS virus destroyes $T$-lymphocytes.
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$(i)$ 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.
| Column$-I$ | Column$-II$ |
| $(a)$. A vector of disease | $(i)$ Bombyx |
| $(b)$. A gregarious pest | $(ii)$ Limulus |
| $(c)$. A living fossil | $(iii)$ Locusta |
| $(d)$. An economically important insect | $(iv)$ Culex |