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ZIMSEC O Level · 4025/1 · N2019

Biology Paper 1 November 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

Biotechnology
Productivity in farming can be improved by
  1. Acytology.
  2. Becology.
  3. Cbiotechnology.
  4. Dmicrobiology.

Question 2

Branches of Biology
Cytology is a branch of Biology which deals with
  1. Amodification of genes.
  2. Bcell structure and function.
  3. Cclassification of animals.
  4. Dparts of the body and their function.

Question 3

Ecology
Ice protects aquatic life by
  1. Aallowing light to pass through.
  2. Bacting as a conductor of heat.
  3. Cinsulating the water below.
  4. Dkeeping predators out.

Question 4

Genetics
The sub units of genetic molecules are
  1. Aamino acids.
  2. Bfatty acids.
  3. Cglucose.
  4. Dnucleotides.

Question 5

Cells and tissues
The part of a eukaryotic cell that contains DNA is the
  1. Acytoplasm.
  2. Bmembrane.
  3. Cnucleus.
  4. Dvacuole.

Question 6

Cells and tissues

The diagram shows a plant cell.

Which part, A, B, C or D, controls the turgidity of the cell?

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

Question 7

Nutrition
The sub units of sucrose are
  1. Agalactose and fructose.
  2. Bgalactose and glucose.
  3. Cglucose and ribose.
  4. Dglucose and fructose.

Question 8

Transport in plants

The diagram shows a transverse section of a dicotyledonous root.

Which tissue, A, B, C or D, is the cortex?

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

Question 9

Transport in plants
In plants, carbohydrates are translocated in the form of
  1. Amaltose.
  2. Bglucose.
  3. Cfructose.
  4. Dsucrose.

Question 10

Plant diseases
Different sized pustules on plant organs are caused by
  1. Abacterial wilt.
  2. Bfungal rust.
  3. Csap-sucking pests.
  4. Dtissue-eating pests.

Question 11

Plant nutrition
Which mineral element is deficient in plants showing poor flowering and fruiting?
  1. Amagnesium
  2. Bnitrogen
  3. Cphosphorus
  4. Dpotassium

Question 12

Transport in plants
Which pair of factors reduces the rate of water loss in plants?
  1. Alow humidity and high wind speed
  2. Bhigh humidity and low temperature
  3. Chigh temperature and high wind speed
  4. Dlow humidity and high light intensity

Question 13

Vegetative reproduction
Which one is an artificial method of vegetative propagation?
  1. Acuttings
  2. Brhizomes
  3. Csuckers
  4. Dtubers

Question 14

Reproduction in plants
A characteristic of insect pollinated flowers is
  1. Adull petals.
  2. Bfeathery stigma.
  3. Cproduction of rough pollen grains.
  4. Dproduction of large amounts of pollen.

Question 15

Coordination

The diagrams show the accommodation of light in the eye.

Which diagram, A, B, C or D, shows how light from a near object falls on the back of the eye to form a clear image?

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

Question 16

Respiration
During inhalation,
  1. Achest pressure increases.
  2. Bchest volume increases.
  3. Cthe rib cage is lowered.
  4. Dthe diaphragm relaxes.

Question 17

Health and disease
Which animal parasite is controlled by dipping?
  1. Atape worm
  2. Bround worm
  3. Ctick
  4. Dfluke

Question 18

Coordination
Which hormone is released when an animal is frightened?
  1. Athyroxine
  2. Binsulin
  3. Cglucagon
  4. Dadrenaline

Question 19

Respiration
Which one is the site of anaerobic respiration in a living cell?
  1. Achloroplast
  2. Bcytoplasm
  3. Cmitochondrion
  4. Dnucleus

Question 20

Transport in animals

The diagram shows the cross section of a mammalian vessel.

The vessel is

  1. Aa capillary.
  2. Ban artery.
  3. Ca vein.
  4. Da lymph vessel.

Question 21

Support and movement
What is the action of the extensor and flexor muscles when stretching the arm?
  1. Aextensor contracts and flexor contracts
  2. Bextensor relaxes and flexor relaxes
  3. Cextensor contracts and flexor relaxes
  4. Dextensor relaxes and flexor contracts

Question 22

Support and movement
Which two bones form a ball and socket joint?
  1. Afemur and scapula
  2. Bhumerus and scapula
  3. Cpelvis and humerus
  4. Dpelvis and tibia

Question 23

Support and movement
Which bone is part of the hind limb of a mammal?
  1. Afemur
  2. Bhumerus
  3. Cradius
  4. Dscapula

Question 24

Health and disease

Immunity can be acquired by transmission of antibodies from mother to foetus.

This type of immunity is

  1. Anatural active.
  2. Bnatural passive.
  3. Cartificial active.
  4. Dartificial passive.

Question 25

Biotechnology

The diagram shows recombinant DNA.

Which part, A, B, C or D, represents the vector?

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

Question 26

Biotechnology
Bacteria is used in the production of
  1. Aalcohol.
  2. Bbread.
  3. Cpenicillin.
  4. Dyoghurt.

Question 27

Classification
Viruses can be classified as living organisms because they
  1. Aexcrete.
  2. Bfeed.
  3. Creproduce.
  4. Drespire.

Question 28

Genetics
The full set of genes in an organism is its
  1. Agenotype.
  2. Bgenome.
  3. Cphenotype.
  4. Dalleles.

Question 29

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

Question 30

Genetics
An allele is
  1. Aa section of DNA coding for a single characteristic.
  2. Bthe set of genes in the nucleus of an individual.
  3. Cthe external appearance of an organism.
  4. Dthe alternative form of a gene.

Question 31

Genetics

In certain plants, red petals is dominant over white petals. When two heterozygous plants were crossed, 85 of the plants produced had white petals.

How many plants had red petals?

  1. A21
  2. B64
  3. C85
  4. D255

Question 32

Genetics
The allele which influences the appearance of the phenotype even in the presence of an alternative allele is
  1. Adominant.
  2. Bheterozygous.
  3. Chomozygous.
  4. Drecessive.

Question 33

Ecology
Which one is a balanced ecosystem?
  1. Aorchard
  2. Bforest
  3. Cgarden
  4. Dpond

Question 34

Classification

The diagram shows an organism.

The organism belongs to kingdom

  1. Aanimalia.
  2. Bfungi
  3. Cplantae.
  4. Dprotista.

Question 35

Classification

The diagram shows the ancestry of the five kingdoms.

An example of an organism in kingdom X is

  1. AE. coliE.\ coli.
  2. BPenicilliumPenicillium.
  3. CPlasmodiumPlasmodium.
  4. DVibrio choleraeVibrio\ cholerae.

Question 36

Ecology

Three living organisms in an ecosystem are represented by the food chain:

grass → caterpillars → birds

Which pyramid of biomass represents this food chain?

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

Question 37

Ecology

The diagram shows the carbon cycle.

What is process X?

  1. Arespiration
  2. Btranspiration
  3. Cdecomposition
  4. Ddigestion

Question 38

Health and disease
Which disease is caused by a worm?
  1. Abilharzia
  2. Bcholera
  3. Csyphilis
  4. Dtyphoid

Question 39

Health and disease
Which one is a short term effect of drinking alcohol?
  1. Aheart disease
  2. Bliver cirrhosis
  3. Cdamaged blood vessels
  4. Dincreased reaction time

Question 40

Health and disease
Drugs used to treat bacterial illnesses are
  1. Aantibiotics.
  2. Banalgesics.
  3. Cprophylactics.
  4. Ddiuretics.

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