MCQ
Bivalent chromosomes align themselves at the equator during
- ✓Metaphase $I$
- BProphase $I$
- CMetaphase $II$
- DAnaphase $II$

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| Column $I$ | Column $II$ | ||
| $A$ | Proximal convoluted tubule | $i.$ | Formation of concentrated urine |
| $B$ | Distal convoluted tubule | $ii.$ | Formation blood |
| $C$ | Henle’s loop | $iii.$ | Reabsorption of $70-80\%$ of electrolytes |
| $D$ | Counter$-$current mechanism | $iv.$ | Ionic balance |
| $E$ | Renal corpuscle medulla | $v.$ | Maintenance of concentration gradient in |
The $R.Q$ of above reaction is