6049Q2 SPECIMEN PAPER CROP SCIENCE

Extracted Content: 6049Q2 SPECIMEN PAPER CROP SCIENCE

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Candidate Name Centre Number Candidate Number

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ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Advanced Level

CROP SCIENCE 6049/2

PAPER 2
SPECIMEN PAPER 2 hours

Additional materials:
Answer paper,
Scientific calculator.

TIME 2 hours

INSTRUCTIONS TO CANDIDATES
Write your name, Centre number and candidate number in the spaces provided at the top of this page and
on all separate answer paper used.

Section A

Answer all questions.

Write your answers in the spaces provided on the question paper. FOR EXAMINER’S USE
Section B
Answer any two questions. Section A
Write your answers on the separate answer paper provided.
At the end of the examination, fasten the separate answer Section B
paper securely to the question paper.

INFORMATION FOR CANDIDATES

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

Y ou are advised to spend no longer than 80 minutes
on Section A.

This question paper consists of 9 printed pages and 3 blank pages.

Copyright: Zimbabwe School Examinations Council, Specimen Paper.

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(a)

(b)

Section A (60 marks)
Answer all questions.
Describe the functions of the following cell organelles:

@ mitochondria,

di chloroplasts,

(iii) ribosomes.

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(a)

(b)

Describe the following routes of water uptake by plants:

(1) Apoplast pathway,

Gi) Symplast pathway.

Describe the following components of water potential:

@ pressure potential,

di osmotic potential.

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(a)

The diagram below shows the rate of photosynthesis in C3 and C4 plants relative
to carbon dioxide concentration.
N
C; plants
Cy plants
Net
Carbon dioxide
assimilation

Carbon dioxide concentration (ppm)

On the diagram, indicate the carbon dioxide compensation point for:

@

C3 plants,
C4 plants. [2]

Explain the difference in net carbon dioxide assimilation between
C3 and Ca plants with increase in carbon dioxide concentration.

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(b)

©

(a)

Discuss how Cz plants are adapted to hot, dry and bright sunlight
conditions?

@

With the aid of diagram, illustrate the soil catena effect.

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oo [4] (b) Explain how soil structure varies with the location on the soil catena. oo [2] (© Describe how the bulk density of a soil sample is determined in a laboratory. we [4] 5 (a) Describe how the carbon: nitrogen (C:N) ratio influences the rate of decomposition of organic matter. [4]

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(b)

©

Outline the role of soil macro-organism.

fertility.

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(b)

Describe the following conservation farming practices:

@ Strip tillage,

di Ridge tillage,

(iv) Minimum tillage.

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10

(a)
6b)

Section B (40 marks)
Answer any two questions.

Discuss the implications of high plant population in crop production.

Suggest factors that can be considered when selecting a crop variety to grow.

Explain the production of a named cereal crop under the following headings:

@
(i)
(iii)
(iv)
(a)
(b)

(a)
6b)

Cultivar selection,
Climatic and soil requirements,
Planting methods,

Harvesting indices.

Describe the criteria used to divide Zimbabwe into agroecological zones.

Discuss how agricultural activities are influenced by environmental
conditions in the listed agro-ecological zone:

@ Agroecological zone 1,
di Agroecological zone 3,

(iii) = Agroecological zone 4.
Outline the mechanisms that make weeds persistent in crop production.

Suggest strategies that farmers can adopt to manage weed populations in
arable lands.

6049/2 SPECIMEN PAPER

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