2019_bio_olevel_nov_paper2

Extracted Content: 2019_bio_olevel_nov_paper2

Page 1

Extracted Text

Centre Number

Candidate Number

For Performance Meaitirucn)

ZIMBABWE SCHOOL EXAMINAT

General Certificate of Education O

TONS COUNCIL,
rdinary Level
plOLOGY

pAPER 2 Theory Structured 4025/2

NOVEMBER 2019 SESSION 2 hours
Candidates answer on the question Paper.
Additional materials:

Electronic caleulator
Pencil (type HB is recommended)

Allow candidates 5 minutes to count pages before the examination.

TIME: 2 hours
INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the spaces al the top of this page and your
entre number and candidate number on the top right hand corner of every page of this paper.
cl

Check that all the pages are in the booklet and ask the invigilator for a replacement if there are duplicate
eck
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 pape!

INFORMATION FOR CANDIDATES

uestion or part question.
The intended number of marks is given in brackets [ | at the end of each q

inations Council, N2019.

mm over
Copyright: Zimbabwe School Exam (Tu

©ZIMSEC N2019

---

Page 2

Extracted Text

Section A s in this section

Answer alll question
esis of enzyme activity.

(a) () Fig. 1.1 illustrates the lock and key hypoth

ee) tle =

Fig. 1.1

Identify, with a reason, C and D.

{4

(iii) | Suggest the property of enzymes that allows formation of C

) xplain why enzymes are efficient in small quantitie
iv E S.

[1]

4025/2 N2019

127

---

Page 3

Extracted Text

Ww

z Ww ;
(b) (i) mite a word equation for the digestion of f.
s of fats

(ii) State any one reagent used when testing for fats

(a) Define the term geotropism.

(b) Describe the effect of gravity stimuli to a horizontal

(i) root of a plant,

(ii) shoot of a plant.

4025/2 N2019

ian
{[Total: 10]

(2)

23]

(2)

---

Page 4

Extracted Text

ts. ism to plan (e) Explain the importance of geotroP —

(Total: ia
(a) Fig, 3.1 shows the structure of a human ovum
A
Cc B
Fig. 3.1

Identify parts A, B and C.

A

Bo cvnee ee dec deccenuteeeeveees ceeeee see eae etee0e sb S00 S04 ene see ee eee ere eee

—__csaemscatens sxmorsnesmeme ennennsestass uailia Se SUELESEDIRDSIS re Heo mere RECT ee

{3}

(b) __ Relate the structure of an ovum to its function.

4025/2 N2019

129

---

Page 5

Extracted Text

©)

(a)

(b)

State any three differences between an ovum and a palisade ce|
Sade cel]

By
{Total: 10]
(i) Name the causative agent of bilharzia.

(ii) State the mode of transmission of bilharzia.

04)

Describe the signs and symptoms of bilharzia.

i]

4025/2 N2019

---

Page 6

Extracted Text

of bilharzia. (c) Outline measures taken to reduce the spread

[4]
[Total: 10]

---

Page 7

Extracted Text

@) @ Fig. 5.10@) and Wig. &, bacterium respectively 8. S-1(b) show the Structure of g vii ; viTus

and a

Ah

Fig. 5.1(a) Fig. 5.1(b)

Identify parts A, B, C and D.
A
B
Cc
(ii) Name the major chemical constituent of part C.
(1)
(iii) | Give a function for part D.

t

4025/2 N2019

---

Page 8

Extracted Text

kingdom. (b) — Explain why viruses do not belong to any

[Total: 10]

(a) (i) Fig. 6.1 is a drawing of an organism found in the soll

Fig. 6.1
Identify the organism.
fl)

(ii) State any three roles of the organism in the soil.

3]

(iii) State any two other biological components of soil.

4025/2 N2019

---

Page 9

Extracted Text

b) Suityest sOlutions te soit . { oe

STOSION at an abandey

MHC ate

{Total

---

Page 10

Extracted Text

Section B

Answer any four questions from this section.

(a) Describe the differences between plant cells and ani mal cells.

b
(b) Relate the structure of the sperm cell to its function.

[6]
[Total: 10]

4025/2 N2019

135

---

Page 11

Extracted Text

(a) Describe the im portance of vegetative propagati gation toam arket gar dener

{6]

(b) Explain the economic importance of plants to hum:
ans.

{4
(Total: 10]

4025/2. N2019

136

---

Page 12

Extracted Text

(a)

(b)

i iver.
Outline the functions of the liv

' ipid digestion.
Explain the effect of blockage of the bile duct on lipid dig

4025/2 N2019

137

(6]

[4]
[Total: 10]

---

Page 13

Extracted Text

(0.

(a)

(b)

Describe how insulin is produced by recombinant DNA tee}
, be! WMOlogy

Explain the benefits of recombinant DNA technology

4025/2 N2019

138

[6

[Total. 10]

|

a

|
J

---

Page 14

Extracted Text

nuous variation and

c ye conti
i. (a) Differentiate, using named examples, between ©

discontinuous variation.

(b) Explain how variation leads to natural selection.

[Total: 10]

4025/2 N2019

---

Page 15

Extracted Text

Describe the role of micro organisms in the nitrogen cycle

| 2. (a)

(b) Compare natural ecosystems and artificial ecosystems.

4025/2 N2019

140

---