2019_bio_olevel_mj_paper2

Extracted Content: 2019_bio_olevel_mj_paper2

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s COUNCIL ||

ee eAMINATI
CHOOL EXAMI rns Level

ZIMBABW heer Certificate ° 4025/2 |

2 hours

BIOLOGY
PAPER 2 Theory JUNE 2019 SESSION
Candidates answer on the question paper
Additional materials:

Electronic calculator
Pencil (type HB is rec ommended)
¢ the examination.

Allow candidates 5 minutes to count pages befor

emoved.

d or stapled and pages should not be F

This booklet should not be punche
Time 2 hours

INSTRUCTIONS TO CANDIDATES
entre number and candidate number in the spaces at the top of this page.
p right comer of every page of this

Write your name, c

Write your centre number and candidate number in the box on the to
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.

Section B
Answer any four questions.

Write your answers in the spaces provided on the question.
INFORMATION FOR CANDIDATES

The number of marks is given in brackets [ ] at the end of each questio
n Or part question.

Copyright: Zimbabwe School Examinations Council, J20
, 19.

©ZIMSEC J2019
Turn over

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Section A

Answer all questions in this section

1 (a) State any two science laboratory

rules.

(b) Give any two Possible causes of accidents in a science laboratory.

(¢) Describe how a sand bucket is used to control fires in a science laboratory.

(d) Suggest any four ways of taking good care of a microscope.

{4]

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; , organelles: Complete Table 2.1 by nam!nB the ofB!

Table 2.1

2 @)

~ function

~~ contr aclivili tS i
! controls the activilics ofacc
|

i ration in a cell
site for acrobic respiration in a

ee eT, aa in accll
| controls entry and exit of substances 171 ©

i ithi i]
helps to maintain pressure within a ce

(b) Explain why

@

the sperm cell contains large amounts of mitochondria,

organelle

Gi)

red blood cells lack nuclei.

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(b)

q@

(O)

(iii)

Write

Suggest, with a re.

Washing powders.

effect

Word Equations to show the action of enzymes on

ason, the effect of using cold water on stain removal capacity of biological

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: ir functions. 4. (a) Table 4.1 shows incomplete information on the parts of an ear and ther 7

Complete Table 4.1.

Table 4.1

eae ein

errr ee a On

| pinna
secretes wax to trap dust and pathogens. |

[4]

(b) State any three possible causes of deafness.

(c) Explain why it is not advisable to listen to very loud music through he
earphones.

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5

(a)

w

Fig. 5.1 (a)
“ ind Fig.
B 5.1 (by show variation in two human characteristics

| Non tongue rollers
SS tongue rollers

number
of
individuals

number
of
individuals

Height

Fig. 5.1(b)

Identify the types of variation shown in:

Fig, 5.1 (a)

Fig. 5.1 (b)

State the two causes of variation.

(ii)

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rs that may affect variation in Fig. 5,1 (b).

(iii) Suggest three facto:

ic i e to a farmer.
(b) Explain how artificial selection might be of economic importance

(a) State the two main components of a food chain.

(b) — State any three features of savanna soils in Zimbabwe.

©

(d)

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Section B

Answer any four questions from this section

(b)

isati ti iving organisms.
Explain the importance of the high heat of vaporisation of water to living org:

(a)

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7 i an diet. Explain the importance of plants in hum

(b)

9 biodiversity-

(a) _ Explain how climatic change is a threat t

(b) Outline any four measures of conserving wildlife.

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11

(b)

(a)

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transmitted

the spread of sexually

(b) Suggest ways of reducing

12 (a) Describe how natural selection can lead to evolution.

(b) Explain the need for animal breeding.

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