2024_bio_olevel_mj_paper2

Extracted Content: 2024_bio_olevel_mj_paper2

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ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

BIOLOGY 4025/2

PAPER 2 2 hours
JUNE 2024 SESSION

Additional materials:
Electronic calculator

Pencil (type HB recommended)
Answer booklet

INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the Section A
spaces at the top of this page.

Section B
At the end of the examination, fasten the answer booklet securely to
the question paper.

INFORMATION FOR CANDIDATES

The intended number of marks is given in brackets [ ] at the a
end of each question or part question.

This question paper consists of two compulsory sections, A and B.

TOTAL

This question paper consists of 13 printed pages and 3 blank pages.
Copyright: Zimbabwe School Examinations Council, J2024.
© ZIMSEC 32024 [Turn over

eer oe CT Tee a et tt te

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Candidate Name

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Section A

Answer all questions in this section,

Write your answers in the spaces provided on the question paper.

1. Fig. 1.1 shows three adjacent water molecules.

(a)

i)

(ii)

(iii)

(iv)

Fig. 1.1
Identify

element X,

bond Y,

Name the bond that is formed between element X and element Z.

Explain the importance of bond Y.

Relate the chemical structure of water to its use as a solvent.

“a

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Examiner’
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Candidate Name Centre Number Candidate Number — i _ _—_ SD For 3 Examiner's Use (b) State two functions of nucleic acids. 2] (¢) Distinguish between glycogen and glucose. [2] : [Total: 10] i 2. (a) Describe the features of a runner plant. : i

2]

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a

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(b) Describe how a new plant develops from a runner plant.

a sansa

(c) Explain the importance of geotropism in plant growth.

- ig
[Total: 10]

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@ @
(ii)

(b) fi)
(ii)

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Define a pathogen

[1]
Explain how each of the skin, tears and ear wax prevent pathogens from
entering the body:

skin
tears

ear wax

(31

Name the two types of white blood cells.

Describe the engulfing action by white blood cells.

(Total: 10]

“oF

For
Examiner’s
Use

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i

Candidate Name Centre Number Candidate Number
6 +
Por
| Examiner
4 Fig. 4.1 illustrates the production of insulin by recombinant DNA technology. Use

[adapted from: https://ib.bioninja.com ]

Fig. 4.1

(a) @ Define the term recombinant DNA.

[1]
(ii) Identify
A,
B.
(iii) State the name given to cell Y after B is put into it.
(1]|

ANIS/D T9094

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saoee tenner

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(iv) Explain the cloning of cell Y.

(b) Explain the advantages of using microorganisms in production of insulin.

fl
(Total: 10]

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5. (a) Define the term co-dominance.
[2]
(b) State any two diseases caused by a gene mutation.
[2]
(c) Name any two factors that increase the rate of mutation.

[2]

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{a) A man heterozygous for blood group B and a woman of blood group AB had a
child.

Using a genetic diagram, show the probability of the child having blood group O.

[4]
[Total: 10]}

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Define the term ecosystem.

List any three physical components of an ecosystem.
1.

2.

3.

Candidate Number

State any two effects of exceeding the carrying capacity of an ecosystem.

{1

[3]

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Examiner’
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(@d) Table 6.1 shows incomplete information comparing clay soils and sandy soil.

Complete Table 6.1 by filling in the missing information.

Table 6.1
property sandy soil clay soil
ae : 1
;

size of particles relatively large course _[felatively small fine

air content _ -
|drainage “| |

[4]

[Total: 10]

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Section B
Answer any four questions from this section.

Write your answers on the answer booklet provided.

7. (a) _List any six contents of a first aid kit. {6]
(b) — Suggest the importance of first aid in a school. {4]
8. (a) __ Describe the lock and key hypothesis of enzyme action. [6]
(b) Explain the use of enzymes in biological washing powders. [4]

9. (a) Describe any three environmenta! factors that affect the rate of
transpiration. [6]
(b) Explain how plant wilting occurs. [4]
10. (a) Describe the effects of adrenaline on any three of its target organs. [6]

(b) Explain how diabetes mellitus can be controlled. [4]

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11. (a) State any two sources of river pollution. [2]
(b) Table 11.1 shows information about body structure of organisms |

found in four kingdoms of classification.
The body structure is not correctly matched to the kingdom in each case.

Copy Table 11.1 and match each body structure to the correct kingdom.

Table 11.1
ry ———T
Kingdom body structure
—_ ~T sometimes joined together,
Animalia simple, single celled
eukaryotes.
. complex multicellular
Protista .
eukaryotes without cell walls.
[ multicellular eukaryotes with
Monera . :
cell walls that contain chitin.
: . | simple, single celled
Fungi
bk, prokaryotes.
[4]
(ce) Explain the effects of climate change on biodiversity. [4]
12. (a) Outline six ways of improving community hygiene. [6]

(b) Explain the importance of contact tracing in the control of Tuberculosis. [4]

ANIEIN TANAA

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