Use this ZIMSEC O-Level Combined Science June 2025 marking scheme for checking answers, revision, and exam preparation in Zimbabwe.
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This is the ZIMSEC O-Level Combined Science marking scheme from June 2025. It shows how marks are awarded, so you can mark your own answers.
Combine science June 2025 answers
1.
a) For chemical reactions in the cells, helps regulate the body temperature through sweating, helps transport nutrients, oxygen and waste products through out the body.
b)
i. Male builder requires more energy than an office worker because a builder does a lot of work that requires a lot energy.
ii. Age/gender/pregnancy
c) Obesity, kwashiorkor, diabetes, anorexia nervosa
2.
a) Sperm duct
b) Temporary storage of sperms
c) Produces sperms and produces hormones
d) Prostate gland
e) It blocks the sperm duct and leads to infertility/ sterility.
3.
Sub-atomic particle | Position | Mass | Charge
Electron | Shells | $\frac{1}{1840}$ | Negative
Neutron | Nucleus | 1 | Zero
Proton | Nucleus | 1 | Positive
b)
i. Isotopes
ii. $18-8=10$ neutrons
iii.
4.
a) Electrolysis is the breaking down of an ionic compound by passing electric current through it.
b) Graphite/carbon/platinum
c) Hydrogen
d) For it to conduct electricity.
e) $2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{H}_{2}$
Hydrogen ion in the solution gains electrons and form hydrogen gas.
5.
a) A is an air filter
$B$ is a jet
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