21. State the meaning of strong acids and weak acids. Give one example of each.
22. Fresh milk has a pH of 6. When it changes into curd (Yogurt), will its pH value increases or
23. Give the respective scientific terms used for studying:
(i) the mechanism by which variations are created and inherited and,
(ii) the development of new type of organisms from the existing ones.
Write two main differences between an acid and a base ?
any trophic level.
25. List four methods of contraception used by humans?
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21) a strong acid is which one virtually 100% ionized in solution
22) when milk change into yoghurt its PH value decreases
23) difference between acid and base
25) (a) mechanical barriers such as condom and similar covering in females
(b) chemical method such as oral hormonal pills
(c) surgical method such as vasectomy in men and tubectomy in women (d) Intrauterine contraceptive device such as Copper T .
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