MCQ
Two main structural features of an ecosystem are.
- ASpecies composition and stratification.
- BSpecies composition and productivity.
- CProductivity and energy flow.
- DNutrient cycling and stratification.
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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 |
