2020_bio_olevel_mj_paper1

Extracted Content: 2020_bio_olevel_mj_paper1

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ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

BIOLOGY 4025/1

PAPER 1 Multiple Choice

JUNE 2020 SESSION 1 hour
Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Mathematical tables/ Electronic 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.

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 17 printed pages and 3 blank pages.
Copyright: Zimbabwe School Examinations Council, J2020.

©ZIMSEC J2020

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In case ofa fire in the laboratory, learners should A run out of the laboratory.

B shout to warn others.

C use windows as exits.

D_ leave in a single file.

The diagrams show some warning symbols used in a laboratory.
Which symbol, A, B, C or D, warns of hot surfaces?

The branch of Biology associated with brewing is
A botany.

B biotechnology.
C cytology.
D

zoology.

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4

The diagram shows the structure of a monossacharide.

CH,OH

AN
vi
Nee |

OH OH

H
| |
asses (7
| |
H OH
The monossacharide is
A. galactose.
B_ fructose,
C glucose.
D

lactose.

Which is not a use of water in living organisms?
A catalyst

B habitat

C reagent

D solvent

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Animals store carbohydrates in the form of A. starch.

B sucrose.
C glucose.
D

glycogen.

Which part of a plant cell is freely permeable?
A. cell wall

B_ cell membrane
C_ cytoplasm

D_ vacuole

The diagram shows a sperm cell.
Which part, A, B, C or D, produces the most energy?

Which statement about enzymes is not true?

A enzymes are protein in nature

B_ enzymes are substrate specific

C_ enzymes work best at optimum temperatures
D

enzymes are broken down after the reaction

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10 Some plant stems are negatively geotropic. This means they grow

A

B
Cc
D

towards gravity.

towards light.

away from gravity.

away from light.

11 The diagram is a summary of the fate of products of photosynthesis.

PHOTOSYNTHESIS

———> respiration.

nitrates from the soil

fats and oils

amino acids
sucrose starch cellulose

proteins

X represents

A

B
Cc
D

glycogen.
glycerol.
glucagon.

glucose.

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12 The leaves of a plant were exposed to radioactive carbon dioxide during daylight. Which part of the stem, A, B, C or D, would contain radioactive carbon?

13 After fertilisation in plants, the ovary
A remains unchanged.
B_ becomes the seed.
C_ becomes the fruit.

D - shrivels and falls.

14 Which mineral deficiency causes chlorosis in plants?
A manganese
B nitrogen
C phosphorus

D potassium

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15

16

17

Which condition would cause a plant to wilt most rapidly?
A low humidity

B low light intensity

C_ low temperature
D

low wind speed

The diagram shows a section of a dicotyledonous seed.
Which part, A, B, C or D, develops into the root?

The role of rennin in digestion is to

A

B
Cc
D

emulsify fats.
neutralise acids.
destroy bacteria.

clot milk protein.

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18 The diagram shows a summary of carbohydrate metabolism.

ae ; muscles
oxidation to glycogen — glucose = actic
CO, and H, 0 name ~ acid

lactic

Blood glucose :
system acid
Tleum
glucose

Which hormone is responsible for regulating process X?
A insulin

B_glycagon

C_ thyroxine

D adrenaline

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19 The diagram shows the human female reproductive system. In which part, A, B, C or D, does fertilisation occur?

20 The kidney is not responsible for
A urine formation.
B_ urea formation.
C pH regulation.
D

reabsorption.

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21 The diagram illustrates the human circulatory system.
Ww xX
LUNGS HEART REST OF BODY

The arrows labelled V and W represent the
A aorta and vena cava respectively.
B_ vena cava and aorta respectively.
C pulmonary artery and pulmonary vein respectively.
D pulmonary vein and pulmonary artery respectively.
22 The graphs show change in blood glucose concentration against time.

Which graph, A, B, C or D, is likely to represent an individual suffering from
diabetes mellitus?

A B
4
concentration concentration
of of
glucose glucose
mg/dm? 9 mgfdm) 9
Time/mins Time/mins
Cc D
concentration conicentration
of of
glucose glucose 9
mg/dm? 9 me/dm?
Time/mins Time/mins

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23 Which component of blood forms clots?
A_ ted blood cells
B_ white blood cells
C platelets

D plasma

24 The diagram shows the bones and muscles of the forearm.

What happens to muscles X and Y when the arm is raised?
A Xrelaxes and Y contracts.

BX contracts and Y relaxes.

C X contracts and Y contracts.

D X relaxes and Y relaxes.

25 Which one is not a characteristic of viruses?
A they are motile
B_ they reproduce
C they have DNA

D they have flagella

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29 What is the percentage of the homozygous recessive offspring from a cross involving
two heterozygotes?

A 25%
B 50%
C 75%

D 100%

30 Which human characteristic is affected by the environment?
A tongue rolling
B_ earlobes
C height

D sex

31 Statement | and 2 describe organism X.

1. Reproduces asexually by means of spores.
2. Cell wall contains chitin.

To which kingdom does X belong?
A protista

B_ fungi
C_ plantae
D

monera

32 The difference between bacteria and all other living organisms is that bacteria have no
A. cell wall.

B_ cytoplasm.

C flagella.

D

nucleus.

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33 The effect of acid rain on ecosystems is that it
A increases plant growth.
B_ increases productivity.
C destroys soil organisms.
D decreases water retention.

34 An experiment was carried out to determine the drainage of four soils, W, X, Y and Z,
The curves show the volume of water collected from each of the soils.

A
70\—-
60 |-
Soil Z
volume 50
of water/ Soil Y
cnr 40 OL.
Soil X
30 [-
Soil W
20
10
0 T T T T T z
2 4 6 8 10 12 14

time/minutes

Which soil is most likely to be sand?
A Z

BY

Cc xX

D W

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35

36

15

The diagram shows a pyramid of numbers for the feeding relationship between
caterpillars, birds, trees and fleas.

X represents the number of

A

B
Cc
D

fleas,
caterpillars.
trees,

birds.

Which one is not an effect of exceeding the carrying capacity?

A

B

Cc

D

overgrazing
drought
pollution

desertification

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37 The diagram shows a summary of the carbon cycle.

carbon dioxide
in the atmosphere

carbon compounds

. : carbon compounds
in decomposing matter

in plants

carbon compounds
in animals

The letter I represents the process of
A combustion.

B respiration.

C photosynthesis.

D nutrition.

38 The diagram shows the life cycle of Plasmodium.
At which stage, A, B, C or D, does the patient suffer from fever?

injection of

malaria parasite parasite

into blood reproduces
sexually in
mosquito

the form of
the parasite A
changes and .
multiplies

c

@

parasite enters
the red blood
cells

We

sexual stage
may be taken up by a
mosquito

parasite multiplies
in red blood cells,

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40

17

Skin cancer in humans can be caused by

A

B
Cc
D

tar.
nicotine.
radiation.

malnutrition.

Tuberculosis treatment involves the use of

5s a &

antibiotics.
chloroqine.
analgesics.

prophylaxis.

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