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ZIMSEC O Level · 4025/1 · J2020

Biology Paper 1 June 2020

Questions
36 of 37
Time allowed
60 min
Syllabus code
4025/1

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Questions
36
Pass mark
22
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Laboratory safety
In case of a fire in the laboratory, learners should
  1. Arun out of the laboratory.
  2. Bshout to warn others.
  3. Cuse windows as exits.
  4. Dleave in a single file.

Question 2

Laboratory safety
The diagrams show some warning symbols used in a laboratory.
Which symbol, A, B, C or D, warns of hot surfaces?
  1. AA
  2. BB
  3. CC
  4. DD

Question 3

Branches of biology
The branch of Biology associated with brewing is
  1. Abotany.
  2. Bbiotechnology.
  3. Ccytology.
  4. Dzoology.

Question 4

Biological molecules

The diagram shows the structure of a monossacharide.

The monossacharide is

  1. Agalactose.
  2. Bfructose.
  3. Cglucose.
  4. Dlactose.

Question 5

Water
Which is not a use of water in living organisms?
  1. Acatalyst
  2. Bhabitat
  3. Creagent
  4. Dsolvent

Question 6

Biological molecules
Animals store carbohydrates in the form of
  1. Astarch.
  2. Bsucrose.
  3. Cglucose.
  4. Dglycogen.

Question 7

Cell structure
Which part of a plant cell is freely permeable?
  1. Acell wall
  2. Bcell membrane
  3. Ccytoplasm
  4. Dvacuole

Question 8

Cell structure
The diagram shows a sperm cell.
Which part, A, B, C or D, produces the most energy?
  1. AA
  2. BB
  3. CC
  4. DD

Question 9

Enzymes
Which statement about enzymes is not true?
  1. Aenzymes are protein in nature
  2. Benzymes are substrate specific
  3. Cenzymes work best at optimum temperatures
  4. Denzymes are broken down after the reaction

Question 10

Plant responses
Some plant stems are negatively geotropic.
This means they grow
  1. Atowards gravity.
  2. Btowards light.
  3. Caway from gravity.
  4. Daway from light.

Question 11

Photosynthesis

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

X represents

  1. Aglycogen.
  2. Bglycerol.
  3. Cglucagon.
  4. Dglucose.

Question 12

Transport in plants
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?
  1. AA
  2. BB
  3. CC
  4. DD

Question 13

Plant reproduction
After fertilisation in plants, the ovary
  1. Aremains unchanged.
  2. Bbecomes the seed.
  3. Cbecomes the fruit.
  4. Dshrivels and falls.

Question 14

Plant nutrition
Which mineral deficiency causes chlorosis in plants?
  1. Amanganese
  2. Bnitrogen
  3. Cphosphorus
  4. Dpotassium

Question 15

Transpiration
Which condition would cause a plant to wilt most rapidly?
  1. Alow humidity
  2. Blow light intensity
  3. Clow temperature
  4. Dlow wind speed

Question 16

Seed structure
The diagram shows a section of a dicotyledonous seed.
Which part, A, B, C or D, develops into the root?
  1. AA
  2. BB
  3. CC
  4. DD

Question 17

Digestion
The role of rennin in digestion is to
  1. Aemulsify fats.
  2. Bneutralise acids.
  3. Cdestroy bacteria.
  4. Dclot milk protein.

Question 18

Homeostasis

The diagram shows a summary of carbohydrate metabolism.

Which hormone is responsible for regulating process X?

  1. Ainsulin
  2. Bglycagon
  3. Cthyroxine
  4. Dadrenaline

Question 19

Human reproduction
The diagram shows the human female reproductive system.
In which part, A, B, C or D, does fertilisation occur?
  1. AA
  2. BB
  3. CC
  4. DD

Question 20

Excretion
The kidney is not responsible for
  1. Aurine formation.
  2. Burea formation.
  3. CpH regulation.
  4. Dreabsorption.

Question 21

Circulation

The diagram illustrates the human circulatory system.

The arrows labelled V and W represent the

  1. Aaorta and vena cava respectively.
  2. Bvena cava and aorta respectively.
  3. Cpulmonary artery and pulmonary vein respectively.
  4. Dpulmonary vein and pulmonary artery respectively.

Question 22

Homeostasis
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?
  1. AA
  2. BB
  3. CC
  4. DD

Question 23

Blood
Which component of blood forms clots?
  1. Ared blood cells
  2. Bwhite blood cells
  3. Cplatelets
  4. Dplasma

Question 24

Movement and support

The diagram shows the bones and muscles of the forearm.

What happens to muscles X and Y when the arm is raised?

  1. AX relaxes and Y contracts.
  2. BX contracts and Y relaxes.
  3. CX contracts and Y contracts.
  4. DX relaxes and Y relaxes.

Question 29

Genetics
What is the percentage of the homozygous recessive offspring from a cross involving two heterozygotes?
  1. A25%
  2. B50%
  3. C75%
  4. D100%

Question 30

Genetics
Which human characteristic is affected by the environment?
  1. Atongue rolling
  2. Bearlobes
  3. Cheight
  4. Dsex

Question 31

Classification

Statement 1 and 2 describe organism X.

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

To which kingdom does X belong?

  1. Aprotista
  2. Bfungi
  3. Cplantae
  4. Dmonera

Question 32

Classification
The difference between bacteria and all other living organisms is that bacteria have no
  1. Acell wall.
  2. Bcytoplasm.
  3. Cflagella.
  4. Dnucleus.

Question 33

Pollution
The effect of acid rain on ecosystems is that it
  1. Aincreases plant growth.
  2. Bincreases productivity.
  3. Cdestroys soil organisms.
  4. Ddecreases water retention.

Question 34

Soil

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.

Which soil is most likely to be sand?

  1. AZ
  2. BY
  3. CX
  4. DW

Question 35

Ecology

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

X represents the number of

  1. Afleas.
  2. Bcaterpillars.
  3. Ctrees.
  4. Dbirds.

Question 36

Ecology
Which one is not an effect of exceeding the carrying capacity?
  1. Aovergrazing
  2. Bdrought
  3. Cpollution
  4. Ddesertification

Question 37

Carbon cycle

The diagram shows a summary of the carbon cycle.

The letter I represents the process of

  1. Acombustion.
  2. Brespiration.
  3. Cphotosynthesis.
  4. Dnutrition.

Question 38

Disease
The diagram shows the life cycle of Plasmodium.
At which stage, A, B, C or D, does the patient suffer from fever?
  1. AA
  2. BB
  3. CC
  4. DD

Question 39

Disease
Skin cancer in humans can be caused by
  1. Atar.
  2. Bnicotine.
  3. Cradiation.
  4. Dmalnutrition.

Question 40

Disease
Tuberculosis treatment involves the use of
  1. Aantibiotics.
  2. Bchloroqine.
  3. Canalgesics.
  4. Dprophylaxis.

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