MCQ
In cockroach, the testes are present in
- A$3,4,5$ abdominal segments
- ✓$4,5,6$ abdominal segments
- C$5,6,7$ abdominal segments
- D$6,7,8$ abdominal segments
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$R :$ Descending limb is impermeable to $Na^+$, while ascending limb is impermeable to $H_2O.$