MCQ
$X$ -chromosome or $X$ - body was first observed by.............
- AMendel $(1901)$
- BCastle $(1910)$
- ✓Henking $(1891)$
- DBateson $(1906)$
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| Method | Mode of Action |
| $(A)$ The pill | $(i)$ Prevents spermsreaching cervix |
| $(B)$ Condom | $(ii)$ Prevents implantation |
| $(C)$ Vasectomy | $(iii)$ Prevents ovulation |
| $(D)$ Copper $T$ | $(iv)$ Semen contains no sperms |