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ZIMSEC O Level · 4025/1 · N2023

Biology Paper 1 November 2023

Questions
39
Time allowed
60 min
Syllabus code
4025/1

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Questions
39
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
Which triangle colour code represents a poisonous substance?
  1. Aorange
  2. Bgreen
  3. Cpurple
  4. Dred

Question 2

Branches of Biology
The application of biological systems in industry is called
  1. Amicrobiology.
  2. Bbiotechnology.
  3. Canatomy.
  4. Dphysiology.

Question 3

Water
Water has high specific heat capacity.
This is important for
  1. Aphotosynthesis.
  2. Btranslocation.
  3. Ccooling.
  4. Dtranspiration.

Question 4

Nutrition
Which result indicates positive for the presence of lipids in a food test?
  1. Ablue black
  2. Bbrick red
  3. Cpurple mauve
  4. Dcloudy white

Question 5

Cells and tissues

The diagram shows a specialised cell.

The cell shown is a

  1. Aroot hair cell.
  2. Bwhite blood cell.
  3. Cred blood cell.
  4. Dnerve cell.

Question 6

Enzymes

The graph shows the effect of temperature on the activity of a mammalian enzyme action.

At which point, A, B, C or D, would the enzyme be denatured?

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

Question 7

Enzymes
Enzymes are affected by pH because they are
  1. Abiological catalysts.
  2. Bspecific in nature.
  3. Cprotein in nature.
  4. Dcoded for by DNA.

Question 8

Plant nutrition
Which one is a function of nitrogen in plants?
  1. Aroot development
  2. Bflower formation
  3. CATP synthesis
  4. Dprotein synthesis

Question 9

Plant diseases
A carnivorous beetle can be used to control aphids in a garden.
Which method of pest control is this?
  1. Abiological control
  2. Bchemical control
  3. Ccultural control
  4. Dmechanical control

Question 10

Transpiration

The diagram shows a simple potometer to measure water uptake.

When placed in windy conditions, the bubble

  1. Amoves downwards.
  2. Bremains stationary.
  3. Cincreases in size.
  4. Dmoves upwards.

Question 11

Seed structure

The diagram shows a section of a monocotyledonous seed.

Which part, A, B, C or D, develops into a root?

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

Question 12

Plant responses
Which growth hormone is released by plants in response to gravity?
  1. Aethylene
  2. Bcytokinin
  3. Cgibberellin
  4. Dauxin

Question 13

Homeostasis
Diabetes mellitus is a result of the malfunction of the
  1. Apancreas.
  2. Bliver.
  3. Cgall bladder.
  4. Dkidney.

Question 14

Health and disease
A vaccine contains an
  1. Aantigen.
  2. Bantibody.
  3. Cantibiotic.
  4. Dantiretroviral.

Question 15

Blood
Which component of blood is responsible for blood clotting?
  1. Aserum
  2. Bplasma
  3. Cplatelets
  4. Dlymphocytes

Question 16

Coordination

A human eye was subjected to different light intensity at R and at S. At R, the circular muscle of the iris contracts and the radial muscle relaxes. At S the circular muscle of the iris relaxes and the radial muscle contracts.

Which one is correct about the light intensity at R and at S respectively?

  1. Abright and bright
  2. Bbright and dim
  3. Cdim and bright
  4. Ddim and dim

Question 17

Digestion

The diagram shows the human alimentary canal.

The part labelled P is the

  1. Arectum.
  2. Beosophagus.
  3. Cileum.
  4. Dduodenum

Question 19

Transport in animals

The diagram shows blood vessels in an animal body.

Which row A, B, C and D correctly identifies the vessels 1, 3 and 5?

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

Question 20

Reproduction in animals
The function of amniotic fluid is
  1. Aexchange of materials.
  2. Bdestroying bacteria.
  3. Cmaintaining temperature.
  4. Dtransport hormones.

Question 21

Nutrition

The diagram shows meals, W, X, Y and Z.

Which one is recommended for a mine worker?

  1. AW.
  2. BX.
  3. CY.
  4. DZ.

Question 22

Homeostasis
Insulin stimulates the liver to convert
  1. Afat to glycogen.
  2. Bglucose to fat.
  3. Cglycogen to glucose.
  4. Dglucose to glycogen.

Question 23

Digestion
Mechanical digestion is
  1. Amovement of food along the gut by peristalsis.
  2. Bingestion of food for assimilation by the body.
  3. Cbreaking large pieces of food into smaller pieces.
  4. Dbreaking large insoluble molecules into small soluble molecules.

Question 24

Coordination
The function of the Eustachian tube found in the ear is to
  1. Amaintain balance in an upright position.
  2. Bamplify vibrations in the ear canal.
  3. Ctransmit vibrations to the oval window.
  4. Dprevent the damage to tympanic membrane.

Question 25

Support and movement
Which row, A, B, C or D, shows the action of muscles to straighten the arm?
  1. AA
  2. BB
  3. CC
  4. DD

Question 26

Excretion
During dialysis, blood cells and protein molecules can not escape from the patient's blood because they
  1. Ahave high pH.
  2. Bare large in size.
  3. Care insoluble in water.
  4. Dhave a lower concentration.

Question 27

Coordination
A patient with a head injury has difficulties in walking.
Which part of the brain has been damaged?
  1. Acerebellum.
  2. Bhypothalamus.
  3. Cmedulla.
  4. Dpituitary.

Question 28

Genetics
A unit of inheritance is
  1. Aan allele.
  2. Ba gene.
  3. Cthe DNA.
  4. Dthe RNA.

Question 29

Variation

The graph shows the distribution of a characteristic in a population.

Which characteristic can be represented by the graph?

  1. Acomplexion
  2. Bdimples
  3. Ceye colour
  4. Dblood group

Question 30

Genetics
Which condition is a result of a chromosomal mutation?
  1. Aalbinism
  2. Bcancer
  3. CDown's syndrome
  4. Dsickle cell anaemia

Question 31

Classification

The diagram shows a microorganism, Z.

To which kingdom does Z belong?

  1. AAnimalia
  2. BProkaryotae
  3. CFungi
  4. DProtista

Question 32

Soil

The pie-chart shows components of a soil sample.

The proportion of air in the soil sample is

  1. A18 %
  2. B28 %
  3. C36 %
  4. D56 %

Question 33

Pollution
Which one is an environmentally friendly method of waste disposal?
  1. Acombustion
  2. Blandfill
  3. Crecycling
  4. Dgasification

Question 34

Ecology
The process responsible for the decrease in biomass in the pyramid of biomass is
  1. Aphotosynthesis.
  2. Brespiration.
  3. Cdecomposition.
  4. Dnitrification.

Question 35

Ecology

The food chain shows energy transfer in a river.

algae to tadpoles to fish to eagles

Which one is an effect of overfishing?

  1. Atadpoles increase, eagles decrease
  2. Btadpoles increase, eagles increase
  3. Ctadpoles decrease, algae increase
  4. Dtadpoles decrease, algae decrease

Question 36

Ecology
An ecosystem is
  1. Ainterdependent living organisms and their physical environment.
  2. Bthe place living organisms in the physical environment stay.
  3. Cdifferent species of living organisms in the physical environment.
  4. Droles played by living organisms in the physical environment.

Question 37

Ecology
In an ecosystem, energy is transferred from one trophic level to another by
  1. Aexcretion.
  2. Begestion.
  3. Crespiration.
  4. Dingestion.

Question 38

Health and disease
Which one is an effect of alcohol on a driver?
  1. Aincreases reaction time
  2. Breduces breaking distance
  3. Cincreases muscular coordination
  4. Dreduces blurred vision

Question 39

Health and disease
Which one is a non-infectious disease?
  1. Acholera
  2. Bkwashiorkor
  3. Ctyphoid
  4. Dtuberculosis

Question 40

Health and disease
Which method does not prevent the spread of the corona virus?
  1. Aisolation
  2. Bquarantine
  3. Csanitising
  4. Dhandshaking

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