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question 6:
*(a) Significance of water treatment stages:*
(i) *Aeration* – Increases oxygen content and removes dissolved gases like carbon dioxide and hydrogen sulfide.
(ii) *Sedimentation* – Removes suspended solids by allowing them to settle.
(iii) *Filtration* – Removes remaining particles and microorganisms.
(iv) *Chlorination* – Kills harmful bacteria and pathogens.
(v) *Coagulation* – Clumps fine particles together for easier removal.
*(b)*
(i) *Weight of a body* – The force with which gravity pulls a body towards the Earth.
(ii) Weight = mass × gravity = 70 kg × 10 m/s² = *700 N*
*(c)* *Five challenges in pig production in Ghana:*
1. Poor housing and hygiene.
2. High cost of feed.
3. Disease outbreaks.
4. Lack of veterinary services.
5. Poor marketing and low prices.
*(d)*
(i) *Three effects of STIs on the male reproductive system:*
1. Painful urination.
2. Infertility due to blocked reproductive tubes.
3. Sores or discharge from the penis.
(ii) *Two glands that produce hormones:*
1. Testes
2. Prostate gland
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Chemistry (Practical) (Alt A) - Instructions to Schools.
*Actual exams on Wednesday, 3rd September, 2025.*
