MCQ
Lacking of $B$-cells and $T$-cells is known as
- AToxigenicity
- BAutoimmunity
- CCytotoxins
- ✓Immune deficiency
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$(I)$ $RBCs$ are formed in the white bone marrow in adults.
$(II)$ $RBCs$ have red colour because presence of protein called haemoglobin.
$(III)$ Nucleus is present in $RBC$ in most of the mammals and are biconcave in shape.
$(IV)$ A healthy individual has $12 -16\, gms$ of haemoglobin in every $1000\, ml$ of blood.
| 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 |

A drug used for ___$A$___ patients is obtained from a species of the organism ___$B$___ .
The one correct option for the two blanks is