Download and practise with this ZIMSEC O-Level Biology Paper 1 November 2023 question paper. Useful for exam revision, past paper practice, and preparation in Zimbabwe.
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This is the ZIMSEC O-Level Biology question paper for Paper 1 from November 2023. Use it for exam practice under timed conditions. The paper code is 4025/1. Time allowed: 1 hour.
# BIOLOGY
**PAPER 1 Multiple Choice**
NOVEMBER 2023 SESSION
Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
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.
There are forty questions in this paper. Answer all questions. 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.
This question paper consists of 16 printed pages.
Copyright: Zimbabwe School Examinations council, N2023.
## Question 1
Which triangle colour code represents a poisonous substance?
A orange
B green
C purple
D red
## Question 2
The application of biological systems in industry is called
A microbiology.
B biotechnology.
C anatomy.
D physiology.
## Question 3
Water has high specific heat capacity.
This is important for
A photosynthesis.
B translocation.
C cooling.
D transpiration.
## Question 4
Which result indicates positive for the presence of lipids in a food test?
A blue black
B brick red
C purple mauve
D cloudy white
## Question 5
The diagram shows a specialised cell
The cell shown is a
A root hair cell.
B white blood cell.
C red blood cell.
D nerve cell.
## Question 6
The graph shows the effect of temperature on the activity of a mammalian enzyme action.
At which point, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\), would the enzyme be denatured?
4025/1 N2023
[Turn over]
## Question 7
Enzymes are affected by pH because they are
A biological catalysts.
B specific in nature.
C protein in nature.
D coded for by DNA.
## Question 8
Which one is a function of nitrogen in plants?
A root development
B flower formation
C ATP synthesis
D protein synthesis
## Question 9
A carnivorous beetle can be used to control aphids in a garden. Which method of pest control is this?
A biological control
B chemical control
C cultural control
D mechanical control
## Question 10
The diagram shows a simple potometer to measure water uptake.
When placed in windy conditions, the bubble
A moves downwards.
B remains stationary.
C increases in size.
D moves upwards.
## Question 11
The diagram shows a section of a monocotyledonous seed.
Which part, A, B, C or D, develops into a root?
## Question 12
Which growth hormone is released by plants in response to gravity?
A ethylene
B cytokinin
C gibberellin
D auxin
## Question 13
Diabetes mellitus is a result of the malfunction of the
A pancreas.
B liver.
C gall bladder.
D kidney.
## Question 14
A vaccine contains an
A antigen.
B antibody.
C antibiotic.
D antiretroviral.
## Question 15
Which component of blood is responsible for blood clotting?
A serum
B plasma
C platelets
D lymphocytes
## Question 16
A human eye was subjected to different light intensity at \(\mathbf{R}\) and at \(\mathbf{S}\). At \(\mathbf{R}\), the circular muscle of the iris contracts and the radial muscle relaxes. At \(\mathbf{S}\) the circular muscle of the iris relaxes and the radial muscle contracts.
Which one is correct about the light intensity at \(\mathbf{R}\) and at \(\mathbf{S}\) respectively?
| | R | S |
| :---: | :---: | :---: |
| A | bright | bright |
| B | bright | dim |
| C | dim | bright |
| D | dim | dim |
## Question 17
The diagram shows the human alimentary canal.
The part labelled \(\mathbf{P}\) is the
A rectum.
B oesophagus.
C ileum.
D duodenum
## Question 18
The diagram shows blood vessels in an animal body.
Which row \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) and \(\mathbf{D}\) correctly identifies the vessels 1, 3 and 5?
| | 1 | 3 | 5 |
| :--- | :--- | :--- | :--- |
| A | artery | capillaries | vein |
| B | vein | capillaries | artery |
| C | artery | vein | capillaries |
| D | capillaries | vein | artery |
## Question 19
The function of amniotic fluid is
A exchange of materials.
B destroying bacteria.
C maintaining temperature.
D transport hormones.
## Question 20
The diagram shows meals, \(\mathbf{W}, \mathbf{X}, \mathbf{Y}\) and \(\mathbf{Z}\).
Which one is recommended for a mine worker?
A W
B X
C Y
D Z
## Question 21
Insulin stimulates the liver to convert
A fat to glycogen.
B glucose to fat.
C glycogen to glucose.
D glucose to glycogen.
## Question 22
Mechanical digestion is
A movement of food along the gut by peristalsis.
B ingestion of food for assimilation by the body.
C breaking large pieces of food into smaller pieces.
D breaking large insoluble molecules into small soluble molecules.
## Question 23
The function of the Eustachian tube found in the ear is to
A maintain balance in an upright position.
B amplify vibrations in the ear canal.
C transmit vibrations to the oval window.
D prevent the damage to tympanic membrane. …