ZIMSEC O-Level Combined Science Paper 1 June 2024 Question Paper

About this question paper

This is the ZIMSEC O-Level Combined Science question paper for Paper 1 from June 2024. Use it for exam practice under timed conditions, then check your work against the marking scheme. The paper code is 4003/1. Time allowed: 1 hour. See the marking scheme.

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Extracted text

# IMBABWE SCHOOL EXAMINATIONS COUNCIL <br> General Certificate of Education Ordinary Level

![](https://ocr.unopasa.com/p/ocr_assets/0df9dcd2ebcd29a13eea14377a692a441a358618a4dd5b453b12fef0307a9b8f.jpg)

**COMBINED SCIENCE**
**4003/1**
**PAPER 1 Multiple Choice**
**1 hour**

**JUNE 2024 SESSION**

Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Calculator (Optional)

### INSTRUCTIONS TO CANDIDATES

Answer all questions. For each question, there are four possible answers, A, B, C and D. Choose the correct answer. Record your choice in soft pencil on the separate answer sheet provided.

Read very carefully the instructions on the answer sheet.

### INFORMATION FOR CANDIDATES

There are forty questions in this paper. Each correct answer will score one mark. Any rough working should be done on this question paper.

## Question 1
The diagram shows a palisade cell.

![](https://ocr.unopasa.com/p/ocr_assets/56f06887473737c9415cf746dff720a11be4d80d411379d02736fcc466063cb0.jpg)

The function of part \(\mathbf{X}\) is to

A trap sunlight.

B maintain the shape of the cell.

C control the activities of the cell.

D allow substances in and out of the cell.

## Question 2
The diagram shows a food web.

![](https://ocr.unopasa.com/p/ocr_assets/c89ce4a57b58e0e70ebedafb69c74715ab15b1dbf1e755ff923f4b12217218fb.jpg)

Which organism is a secondary consumer?

A grass

B goat

C frog

D rabbit

## Question 3
Which human characteristic shows discontinuous variation?

A sex

B mass

C height

D foot length

## Question 4
During digestion, the enzyme amylase converts

A protein to amino acids.

B starch to glycogen.

C starch to maltose.

D fats to fatty acids and glycerol.

## Question 5
Kwashiorkor is a deficiency disease caused by lack of

A fats.

B proteins.

C vitamins.

D carbohydrates.

## Question 6
An experiment was set up to investigate a factor of photosynthesis as shown in the diagram.

![](https://ocr.unopasa.com/p/ocr_assets/46f31c2a2f088df8945399668557fb796ba25bfbe8512282aeb7daf93ec4d492.jpg)

What is the function of the sodium hydroxide in the experiment?

A to release oxygen

B to absorb oxygen

C to absorb carbon dioxide

D to release carbon dioxide

## Question 7
The diagram shows part of the human respiratory system. In which part, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), does gaseous exchange take place?

![](https://ocr.unopasa.com/p/ocr_assets/865b1192b9b9d07c53e64b362cbf6bee8d764f649ff354dc16b5dfe357852ec8.jpg)

## Question 8
Blood capillaries have

A valves.

B very large lumen.

C walls that are one cell thick.

D muscle layers which are very thick.

## Question 9
Which component of blood carries hormones around the body?

A plasma

B platelets

C red blood cells

D white blood cells

## Question 10
The diagram shows the general structure of a flower.

Which part, A, B, C or D, develops into a fruit after fertilisation?

![](https://ocr.unopasa.com/p/ocr_assets/1166a32857fd7f0c6931d06edfb062c011d54a03070f89110b8b8fbed4cdc63b.jpg)

## Question 11
The diagram shows the male reproductive system.

Which part, A, B, C or D, is cut or tied during sterilisation?

![](https://ocr.unopasa.com/p/ocr_assets/fd988ff1e9c883178d6736ae8e52849159c96573076a2b1ca29b02e25175bf9c.jpg)

## Question 12
The diagram shows a process in human reproduction.

![](https://ocr.unopasa.com/p/ocr_assets/62c3ca43dde2531ee937d7d4a14bd57c8422c84336808ce1f1036ea62ea06387.jpg)

Which process is shown?

A ovulation

B menstruation

C implantation

D fertilisation

## Question 13
Which disease is caused by bacteria?

A malaria

B bilharzia

C syphilis

D genital herpes

## Question 14
Vomiting, diarrhoea and abdominal pains are signs and symptoms of

A scurvy.

B cholera.

C anaemia.

D gonorrhoea.

## Question 15
The diagram shows a method of separating dyes.

![](https://ocr.unopasa.com/p/ocr_assets/e78775a23d8979df97aa8470ae183cebcce771cbe287c754a3dd16c42256c538.jpg)

The method of separation shown in the diagram is

A filtration.

B distillation.

C evaporation.

D chromatography.

## Question 16
Which substance is a mixture?

A air

B oxygen

C magnesium

D magnesium oxide

## Question 17
One mole of hydrogen and one mole of sodium chloride have the same number of

A neutrons.

B electrons.

C protons.

D particles.

## Question 18
An organic compound contains \(84\%\) carbon \((\mathrm{C})\) and \(16\%\) hydrogen \((\mathrm{H})\) by mass.

What is the empirical formula of the organic compound?

[Atomic mass of carbon is 12 and that of hydrogen is 1]

A \(\quad \mathrm{CH}\)

B \(\quad \mathrm{CH}_{2}\)

C \(\quad \mathrm{C}_{12} \mathrm{H}\)

D \(\quad \mathrm{C}_{7} \mathrm{H}_{16}\)

## Question 19
Which process is used to manufacture ammonium nitrate fertiliser from ammonia?

A reduction

B distillation

C electrolysis

D neutralisation

## Question 20
Lemon juice is considered to be a weak acid.

Which observations, with litmus paper, shows that lemon juice is an acid?

|  | blue litmus | red litmus |
| :--- | :--- | :--- |
| A | remains blue | remains red |
| B | turns red | remains red |
| C | remains blue | turns blue |
| D | bleaches | bleaches |

## Question 21
The diagram shows a reaction of dilute hydrochloric acid with substance \(\mathbf{X}\) to produce a magnesium salt.

![](https://ocr.unopasa.com/p/ocr_assets/37d83b903e674bcde8ec065fd5ee98f784c8646e84630d66ed19fb473bf07d43.jpg)

Substance \(\mathbf{X}\) is

A magnesium.

B magnesium oxide.

C magnesium chloride.

D magnesium hydroxide.

## Question 22
The flow diagram shows the stages involved in the separation of the gases in air.

![](https://ocr.unopasa.com/p/ocr_assets/03aad4dd780222a15d8095f76746a27b8ab0452aac1a3362b800abd12526c9b1.jpg)

Which gas is collected as a liquid at a temperature of \(-183^{\circ} \mathrm{C}\) by the fractional distillation process?

A hydrogen

B nitrogen

C oxygen

D carbon dioxide

## Question 23
The equation shows the production of …