2018_bio_olevel_nov_paper2

Extracted Content: 2018_bio_olevel_nov_paper2

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Surname

F anne
orename(s) Centre Number Candidate Number

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

BIOLOGY 4025/2
PAPER 2 Theory

Candidates answer on the question — zo pesto 2 hours
Additional materials: Electronic calculator
Allow candi _ Pencil (type HB is recommended)

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 num ber and candidate number in the spaces at the top of this page
and your centre number and candidate number on the top right hand comer of every page of this

paper.

Check that all the pages are in 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.

Copyright: Zimbabwe School Examinations Council, N2018.
[Turn over

@ZIMSEC N2018

22

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Section A

Answer all questions in this section.

(a) Fig.1.1 shows a group of specialised cells.

@)

(ii)

J,

*%,
S hia, :

Fig. 1.1

Identify the specialised cells in Fig.1.1.

(Hy
State any three ways in which these cells are specialised for
their function.
1
2;
3. (3]

4025/2 N2018

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1 (b) i @ State any three factors that influence the rate of photosynthesis 1. 2: 3. By (ii) Explain the importance of photosynthesis in a natural ecosystem. (31 [Total:10] 2 Fig. 2.1 shows a section through a human tooth. wie fa ] B y Cc Fig.2.1 (a) (i)_~—sName the parts labelled A, B and C. A B 3 e (3]

4025/2 N2018

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iad

Identify the type of tooth shown in Fig.2.1.

(a) (ii)
— ty
(b) (i) State the function of this tooth.
Uy
(ii) Describe any two structural adaptations of this tooth to its

function.

adaptation |

adaptation 2 -

[2]

(c) Explain the formation of the cavity.

[3]
[Total: 10]

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Fig.3.1 shows two 'vpes of white-blood cells. A and B

Fig.3.1 8

(a) Identify the cells A and B

(b) State three visible differences in structure between cells A and B

[3]

od

$0252 N2018

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(c) Describe the functions of the:

1. blood plasma

2. platelets

sane {4}
(d) Name any substance that is found in blood plasma and notin tissuc
fluid.
sorgpes setae sence Ses a {}}
{Total 16}
(a) State the functions of the following parts of a joint
ligament___
cartilage —
tendon s
ee tee 3]

(b) Name one type of joint and describe the type of movement it allows

(2|

4025/2 N2018

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ry

(c) Outline the functions of the skeleton

(5)

(a) (i)

(ii)

{Total:19]

Define malnutrition.

122)

Describe the symptoms of:

1. kwashiokor

z scurvy

4025/2 N2018

28

tl

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(b)

Fig.5.1 show

@

(ii)

sa malnutritional disorder.

Fig.5.1

Identify this disorder.

Explain why a person with this disorder is likely to suffer
from Coronary Heart Disease.

4025/2 N2018

U1)

(3)
[Total:10]

6

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&

(a)

(b)

(c)

Explain the {orm vartation

(2)
Identify the two {ypes of variation giving an example of a human

feature in each case.

type Is

example:

type 2:

{4]

example:

tioned in (b).
Sketch graphs that would be produced for features mentione

(4
[Total:10]

4025/2 N2018

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Section B

Answer any four questions from this section.

(a) State and explain any three propcertics of enzymes.
1. _ — a a
2, a
3.
{6
(b) Explain the importance of enzymes to living organisms.
Pp
(4]
[Total:10]
4025/2 N2018

31

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(a) Explain why a maize plant is classified as a monocotyledonous plant.

\4l

i ‘ inimize
(b) Describe how plants that grow in arid areas are adapted to min’
water loss.

4025/2 N2018

32

16]

[Total:10]

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(b)

(a)

Outline the functions of blood.

Explain the structural adaptations of arteries to their function.

4025/2 N2018

16]

(4
[Total: 10]

10

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1 (a) Explain the eff ai 1 0 a Xplain th ects of nitr: ed from agricultural ates that are rcleas geri

activities.

{6}

(b) Describe the measures taken by a farmer to restore lost nitrates.

(4
[Total: 10|

4025/2 N2018

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a longitudinal section of a flower.

il Fig.11.1 shows

Fig.11.1

(a) Describe the
changes which occur t
to parts X, Y and Z
: after fertilization

[6]

4025/2 N2018

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W (b) Explain the mechani:

Sms adapted by flowers to promote insect
pollination.

(4)
[Total:10]

12 Fig.12.1 illustrates a reflex arc causing the movement of the human hand
away from a hot object.

spinal cord

Fig12.1 ae Sa
1Z.12.! _

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36

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(a)

(b)

Describe with reference to
taken to remove the hand }

Distinguish between the endocrine and the n

transmission of messages 1

d from the h

the p@

ervous system in the
n the human body.

i

[4]
[Total:10]

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