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ZIMSEC O Level · 4025/1 · J2019

Biology Paper 1 June 2019

Questions
40
Time allowed
60 min
Syllabus code
4025/1

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Questions
40
Pass mark
24
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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

The diagram shows a safety symbol used in a science laboratory.

The symbol is a warning against

  1. Afires.
  2. Bsmoke.
  3. Cradiation.
  4. Dfans.

Question 2

Branches of Biology
Which branch of Biology involves the study of cells?
  1. Abotany
  2. Banatomy
  3. Cecology
  4. Dcytology

Question 3

Nutrition
Which carbohydrate is a polysaccharide?
  1. Aglucose
  2. Bmaltose
  3. Cstarch
  4. Dsucrose

Question 4

Photosynthesis
In photosynthesis, water is used as a
  1. Acoolant.
  2. Bcatalyst.
  3. Csolvent.
  4. Dreagent.

Question 5

Cells and tissues
The organelle that contributes to the osmotic properties of a plant cell is the
  1. Acell wall.
  2. Bchloroplast.
  3. Ccytoplasm.
  4. Dvacuole.

Question 6

Transport in animals
Which feature of a red blood cell increases its surface area?
  1. Apresence of haemoglobin
  2. Babsence of a nucleus
  3. Cthin membrane
  4. Dthin cross section

Question 7

Cells and tissues

The diagram shows an animal cell.

In which part, A, B, C or D, does aerobic respiration take place?

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

Question 8

Enzymes
Which statement about enzymes is not true?
  1. Athey are biological catalysts
  2. Bthey are used up during catalysis
  3. Cthey are substrate specific
  4. Dthey are protein in nature

Question 9

Enzymes
Enzyme activity
  1. Aincreases with increase in pH then remains constant
  2. Bdecreases with increase in pH then remains constant.
  3. Cincreases with increase in pH then decreases.
  4. Ddecreases with increase in pH then increases.

Question 10

Enzymes

The diagram illustrates a mode of action of enzymes.

This mode of action is called

  1. Aactivation and binding.
  2. Bactivation and breakdown.
  3. Clock and catalysis.
  4. Dlock and key.

Question 11

Reproduction in plants
Which factor is not necessary for the germination of seeds?
  1. Alight
  2. Bwarmth
  3. Coxygen
  4. Dmoisture

Question 12

Transport in plants

The diagram shows a cross section of a dicotyledonous root.

Which part, A, B, C or D, is responsible for transporting organic molecules?

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

Question 13

Transport in plants
Which condition results in rapid transpiration?
  1. Alow humidity
  2. Blow light intensity
  3. Clow temperature
  4. Dlow wind speed

Question 14

Reproduction
Which one is an advantage of sexual reproduction?
  1. Aincrease in genetic variation
  2. Bmaintenance of desirable characteristics
  3. Cintense colonisation of an area
  4. Dreduction in competition with other species

Question 15

Reproduction in plants

The diagram shows a bean seed cut in half.

In which part, A, B, C or D, is food stored?

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

Question 16

Photosynthesis

The diagram shows one of the steps in testing a leaf for starch.

What is liquid X?

  1. Awater
  2. Blimewater
  3. Calcohol
  4. Diodine solution

Question 17

Photosynthesis

The graph shows results of an investigation on factors affecting the rate of photosynthesis.

Which factor is limiting the rate of photosynthesis when the curves are flat?

  1. Acarbon dioxide
  2. Btemperature
  3. Clight
  4. Dwater

Question 18

Respiration
A long term effect on smoking on the respiratory system is
  1. Aconstriction of bronchioles.
  2. Bdestruction of alveoli.
  3. Cincreased mucus production.
  4. Dparalysis of cilia.

Question 19

Coordination
Memory, intelligence and consciousness in the brain is controlled by the
  1. Acerebellum.
  2. Bcerebrum.
  3. Chypothalamus.
  4. Dmedulla oblangata.

Question 20

Nutrition
Shortage of vitamin A in the diet leads to
  1. Ableeding under the skin.
  2. Bformation of soft bones.
  3. Cpoor healing of wounds.
  4. Dreduced resistance to disease.

Question 21

Health and disease
Which type of immunity will be acquired through vaccination?
  1. Anatural active
  2. Bartificial active
  3. Cnatural passive
  4. Dartificial passive

Question 22

Nutrition

The diagram shows the structure of a tooth.

Which part, A, B, C or D, is the hardest?

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

Question 23

Coordination

The diagram shows the positions of the human endocrine glands.

Which hormone is secreted by gland 3?

  1. Athyroxine
  2. Badrenaline
  3. Ctestosterone
  4. Dglucagon

Question 24

Growth

The diagram shows the growth curve of a rabbit.

Which is the best time to slaughter the rabbit?

  1. A6 weeks
  2. B8 weeks
  3. C10 weeks
  4. D12 weeks

Question 25

Reproduction in animals

The diagram represents the menstrual cycle.

At which stage, A, B, C or D, is fertilisation most likely to occur?

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

Question 26

Biotechnology
Fungi are used in the production of
  1. Ayoghurt.
  2. Bpenicillin.
  3. Cthyroxine.
  4. Dglucagon.

Question 27

Biotechnology

The diagram shows the stages in the production of insulin by gene technology in random order.

The correct order of the stages is

  1. A5 → 3 → 2 → 4 → 1 → 6.
  2. B1 → 2 → 3 → 4 → 5 → 6.
  3. C3 → 5 → 4 → 6 → 2 → 1.
  4. D2 → 4 → 6 → 5 → 1 → 3.

Question 28

Genetics
The approximate monohybrid ratio is
  1. A1:1.
  2. B2:1.
  3. C3:1.
  4. D4:1.

Question 29

Variation
A new species arises from an existing species by
  1. Aevolution.
  2. Breproduction.
  3. Cselection.
  4. Dvariation.

Question 30

Genetics
An allele which expresses itself only when homozygous is
  1. Adominant.
  2. Bhomologous.
  3. Crecessive.
  4. Dcodominant.

Question 31

Genetics

A man has blood group A and his wife has blood group B.

Which genotype cannot be inherited by any of their children?

  1. AIAIAI^A I^A
  2. BIAIBI^A I^B
  3. CIAIOI^A I^O
  4. DIOIOI^O I^O

Question 32

Genetics

In pea plants, the allele for red flowers is co-dominant with that for white flowers.

When heterozygote pea plants self pollinate, they produce,

  1. Ared flowered plants and white flowered plants in a ratio of 1:1.
  2. Bred flowered plants and no white flowered plants.
  3. Cwhite flowered plants and no red flowered plants.
  4. Dred flowered plants and white flowered plants in a ratio of 3:1.

Question 33

Classification
A diagnostic feature for the kingdom plantae is the presence of
  1. Acellulose.
  2. Bcytoplasm.
  3. Cmitochondria.
  4. Dnucleus.

Question 34

Classification

The diagram shows the structure of an organism.

To which kingdom does the organism belong?

  1. Afungi
  2. Bmonera
  3. Cprotista
  4. Danimalia

Question 35

Ecology
Which one helps improve soil fertility?
  1. Alocusts
  2. Btermites
  3. Cflukes
  4. Dcaterpillars

Question 36

Ecology
One harmful human activity on the ecosystem is
  1. Aapplying fertiliser just before it rains.
  2. Badding organic matter to the soil.
  3. Cploughing along contours.
  4. Dkeeping ground cover.

Question 37

Ecology
Which food chain is correct?
  1. Agoat → grass → cow → lion
  2. Bgrass → cow → man → lion
  3. Ccow → man → hyena → lion
  4. Dhyena → man → lion → vulture

Question 38

Health and disease
Analgesic drugs are responsible for
  1. Adestroying fungi.
  2. Bkilling bacteria.
  3. Creducing anxiety.
  4. Dsuppressing pain.

Question 39

Health and disease
A degenerative disease is caused by
  1. Amalnutrition.
  2. Bgenetic factors.
  3. Cinfection.
  4. Dold age.

Question 40

Health and disease
Which disease is non-infectious?
  1. Acancer
  2. Bcholera
  3. Ctuberculosis
  4. Dtyphoid

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