MCQ
$CuT, LNG-20$ and $Cu7$ are examples of
- AContraceptive pills
- BSurgical methods of sterilization
- C$ART$
- ✓Intrauterine device,
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$R :$ Descending limb is impermeable to $Na^+$, while ascending limb is impermeable to $H_2O.$

| List $I$ | List $II$ |
| $A.$ Fibrous joints | $I.$ Adjacent vertebrae, limited movement |
| $B.$ Cartilaginous joints | $II.$ Humerus and Pectoral girdle, rotational movement |
| $C.$ Hinge joints | $III.$ Skull, don't allow any movement |
| $D.$ Ball and socket joints | $IV.$ Knee, help in locomotion |
Choose the correct answer from the options given below :
Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.