Download and practise with this ZIMSEC O-Level Combined Science Paper 1 June 2025 question paper. Useful for exam revision, past paper practice, and preparation in Zimbabwe.
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This is the ZIMSEC O-Level Combined Science question paper for Paper 1 from June 2025. Use it for exam practice under timed conditions. The paper code is 4003/1. Time allowed: 1 hour.
# ZIMBABWE SCHOOL EXAMINATIONS COUNCIL
**General Certificate of Education Ordinary Level**
**COMBINED SCIENCE**
PAPER 1 Multiple Choice
JUNE 2025 SESSION
Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Calculator (optional)
Time: 1 Hour
### INSTRUCTIONS TO CANDIDATES
Do not open this booklet until you are told to do so.
Write your name, centre number and candidate number on the answer sheet in the spaces provided unless this has already been done for you.
Answer all questions. There are forty questions in this paper.
For each question, there are four possible answers, A, B, C and D.
Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet.
Read very carefully the instructions on the answer sheet.
### INFORMATION FOR CANDIDATES
Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet.
## Question 1
Which structure is found in both plant and animal cells?
A chloroplast
B nucleus
C starch grain
D cellulose cell wall
## Question 2
Where does the most transpiration take place in a plant?
A cuticle
B root hairs
C stomata
D xylem
## Question 3
The diagram shows a sketch of the human alimentary canal. Where does the chemical digestion of proteins begin?
## Question 4
What is the function of the gall bladder?
A production of bile
B absorption of fats
C digestion of fats
D storage of bile
## Question 5
Which disease is caused by a deficiency of vitamin A?
A scurvy
B rickets
C anaemia
D night blindness
## Question 6
The diagram shows a transverse section of a dicotyledonous root.
Which part transports water?
## Question 7
Which word equation shows the raw materials and products of photosynthesis?
A glucose + water ⟶ carbon dioxide + water
B carbon dioxide + water ⟶ glucose + oxygen
C glucose + oxygen ⟶ carbon dioxide + water
D carbon dioxide + glucose ⟶ water + oxygen
## Question 8
The diagram shows a leaf from a plant kept in the sun for 48 hours.
The leaf was tested for starch using iodine solution.
Which colour was observed on the green part?
A green
B white
C brown
D blue-black
## Question 9
The diagram shows a food web.
Which organism is a primary consumer?
A vulture
B snake
C hare
D plant
## Question 10
In the carbon cycle, which process releases carbon into the atmosphere?
A respiration
B photosynthesis
C lightning
D feeding
## Question 11
Which component of blood is responsible for blood clotting?
A plasma
## Question 12
The diagram shows a vertical section through the human heart.
Which arrow, A, B, C or D, shows the movement of oxygenated blood from the lungs?
## Question 13
In which part of the female reproductive system does fertilisation take place?
A ovary
B uterus
C oviduct
D vagina
## Question 14
A farmer planted X seeds and 30% germinated.
What is the value of X if 12 seeds germinated?
A 21
B 40
## Question 15
The diagram shows results of a paper chromatography process for four samples of a chemical substance.
Which sample, A, B, C or D, of the chemical substance has two dyes?
## Question 16
Element K has an electronic configuration of \(2,8,6\) and element P has an electronic configuration of \(2,8,2\).
Which one is the correct chemical formula of the product of the reaction between K and P?
A KP
B \(K_2P\)
C \(KP_2\)
D \(K_2P_3\)
## Question 17
What is the proton number of a sodium atom, \({ }_{11}^{23}Na\)?
A 11
B 12
C 72
## Question 18
What is the molecular mass of \(Ca(OH)_2\)? [Ar of Ca = 40.0, Ar of O = 16.0 and Ar of H = 1.0]
A 58.0
B 62.0
C 74.0
D 124.0
## Question 19
It took 3 minutes for 5.0 g of copper sulphate granules to completely dissolve in \(50 cm^3\) of cold water.
Which condition decreases the time taken for the copper sulphate to completely dissolve?
A decreasing the volume of the water
B decreasing the temperature of the water
C increasing the temperature of the water
D increasing the size of the copper sulphate granules
## Question 20
The table shows pH values of four solutions, A, B, C and D.
Which solution, A, B, C or D, is alkaline?
| solution | pH |
| :---: | :---: |
| A | 1 |
| B | 4 |
| C | 7 |
| D | 14 |
## Question 21
The diagram shows the fractional distillation of liquid air.
Which gas is collected at X?
A oxygen
B nitrogen
C hydrogen
## Question 22
Which halogen is used to purify water?
A bromine
B fluorine
C chlorine
D iodine
## Question 23
The diagram shows an electrolytic cell.
Which part, A, B, C or D, is the anode?
## Question 24
Which one is a raw material used in the blast furnace during the extraction of iron?
A coke
B slag
C cold air
D carbon monoxide
## Question 25
Which catalyst is used in the manufacture of sulphuric acid?
A iron
B platinum
C rhodium
D vanadium (V) oxide
## Question 26
Which one is a product of the complete combustion of methane, \(CH_4\)?
A oxygen
B carbon soot
C carbon dioxide
D carbon monoxide
## Question 27
A gas is produced …