📄 Exam Questions & Readable Text Transcript
Full OCR-extracted text of questions, syllabus codes, and exam instructions.
Extracted Content: 4025q2 Specimen paper
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Surname Forename(s) Centre Number Candidate NumberFor Perfe
ZIMBABWE SCHOOL EXAMINATIONS COUNCIL
General Certificate of Education Ordinary Level
BIOLOGY 4025/2
PAPER 2 Theory
SPECIMEN PAPER 2 hours
Candidates answer on the question paper
Additional materials: Electronic calculator
Pencil (type HB is recommended)
Allow candidates 5 minutes to count pages before the examination.
This booklet should not be punched or stapled and pages should not be removed.
TIME 2 hours
INSTRUCTIONS TO CANDIDATES
Write your name, centre number and candidate number in the spaces at the top of this page
and your centre number and candidate number on the top right hand corner of every page of this
paper.
Check the booklet and ask the invigilator for a replacement if there are duplicate or missing pages.
Section A
Answer all questions.
Write your answers in the spaces provided on the question paper.
Section B
Answer any four questions.
Write your answers in the spaces provided on the question paper.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each question or part question.
This question paper consists of 14 printed pages and 2 blank pages.
Copyright: Zimbabwe School Examinations Council, Specimen paper.
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Section AAnswer all questions in this section.
1. Fig.1.1 shows the action of an enzyme on a substrate.
(a)
enzyme combines with enzyme free to products
substrate for a short time take part in
next reaction
Fig. 1.1
Define the term enzyme.
Gi)
State any example of an enzyme and a substrate that could be
represented by Fig 1.1.
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(©) Identify the deficient mineral in plants with the following leaf features:Chlorotic leaves
oo [3]
(d) —_ State an effect of mineral deficiency on plant productivity
oe [1]
[Total 10]
(a) Define the term transpiration.
oo [2]
(b) — Explain the importance of transpiration to plants.
[3]
() Describe the distribution of stomata in dicotyledonous leaves.
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(d)(a)
Distinguish between monocotyledonous and dicotyledonous plants.
monocotyledons
cotyledons
Fig 3.1 shows parts of the respiratory system.
@
Fig 3.1
Identify the parts labelled P.Q and R
[Total: 10]
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(ii) State the functions of parts labelled:(b) —_ State four effects of smoking on the respiratory system.
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4Fig 4.1 shows a longitudinal section through a maize grain.
Fig 4.1
(a) State which one of the part(s) A, B, C, D and/or E form(s) the plant
embryo.
(b) Describe the activities of enzymes in A and D during germination.
() State two differences between a maize seed and a bean seed.
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(d) Suggest why certain seeds may not germinate if sown: @ during winter periodsdi water logged soils
[1]
[Total 10]
Fig 5.1 shows a developing mammalian fetus and a part of the uterus wall.
(a) Name the parts labelled A, B, and C.
A eee
Be
C [3]
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(b)(©)
(d)
(a)
State any three functions of D during pregnancy.
woe [3]
[Total:10]
Distinguish between the terms:
@ dominant allele and recessive allele.
(ii) phenotype and genotype.
(iii) homozygous and heterozygous.
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(b) Explain how a child with Down’s Syndrome may be born to normal parents.4025/2 Specimen paper
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10Section B
Answer any four questions.
(a) Describe how raw materials for photosynthesis reach the palisade layer
from their source.
(b) Explain how the dicotyledonous leaf is adapted for photosynthesis.
oo [4]
[Total:10]
(a) Explain how eating chocolates and sweets contributes to tooth decay.
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11(b) Describe how dental decay can be prevented.
[Total: 10]
Outline the role of the liver in the metabolism of the following products:
(a) Amino Acids
oo [4]
(b) — Sugars/ Glucose
[4]
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(©)(b)
12
Fatty Acids and Glycerol
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1311 Describe changes which occur during the menstrual cycle phases to the human:
(a) uterus lining.
(b) ovaries
wo [4]
[Total:10]
12 (a) Outline measures that could be taken to conserve elephants in
Zimbabwe.
[6]
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14(b) — Explain the role of decomposers in the nitrogen cycle.
wo [4]
[Total:10]
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