6049q3 Specimen

Extracted Content: 6049q3 Specimen

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Candidate Name Centre Number Candidate Number

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Advanced Level

CROP SCIENCE 6049/3

PAPER 3 Practical Test

SPECIMEN PAPER 2 hours 30 minutes

Additional materials:
Answer paper,
Graph paper,
As listed in Instructions to Supervisors,
Scientific Calculator.

TIME 2 hours 30 minutes + 10 minutes preparation time.
INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the spaces at the top of this page and on
every page of your answer paper.

This paper consists of three questions. Answer all questions. The number of marks is given in
brackets [ ] at the end of each question or part question.

Y ou are advised to spend the first 10 minutes carefully reading through the whole paper before
answering any questions. Spend at least 40 minutes on each question. All writing must be in blue
or black ink except for diagrams which must be drawn in pencil.

Y ou are reminded of the need for good English and clear presentation in your answers.

FOR EXAMINER’S USE

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This question paper consists of 8 printed pages.

Copyright: Zimbabwe School Examinations Council, Specimen Paper.
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CS1 is a dry soil sample

Place the dry soil into a measuring cylinder, shake it down gently until it comes up to
30cm3.

Pour 30cm: of distilled water into the measuring cylinder with soil.
Shake gently or stir until all the soil is wet.

(a) Read the final level of water in the cylinder after 10 minutes and record
your observations.

a [4]
(b) State the soil component being investigated
a [1]
(c) Calculate the percentage of the component being investigated
a [3]
(d) —_ Explain the significance of the component being investigated in the soil.
a [5]

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(e) How can a farmer manage his/her soil to improve the availability of the component being investigated?

(3) Besides the component under investigation, state any other three soil
components.

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(a)

CS2 and C83 are fertiliser samples.

Y ou are required to determine the behaviour of the fertilisers when placed on
soil surface on a rainy day.

Proceed as follows:

Weigh 40 g of the soil sample provided.

Place into a filter fitted funnel.

Place over a 50 ml measuring cylinder.

Prepare three sets of this set up and label them A, B and C.

Weigh 10g of CS2 and place on top of the soil in B. Repeat the process with
CS3 and put inc.

Pour 40ml of distilled water gently over all the three set ups.

Record your observations during the pouring of the distilled water and after
10 minutes.

@ Observations

(ii) Measure the pH of filtrates B and C.

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(iii) Comment on the results obtained in (i) and (ii).

(iv) From the observations on the behaviour of the fertilizers, suggest
suitable management practices when using CS2 and C$3 fertilizers.

(v) | What are the long term effects of using high amounts of CS2 and C$3
to the soil environment?

(b) If the application rate of CS2 is 20g per planting station in maize production,
how much of CS2 would you require for a hectare plot using a plant spacing
of 30cm by 90cm?

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(©)

(d)

Justify the use of CS2 and CS3 fertiliser types over organic fertilizers in crop
production.

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(a)

Y ou are required to investigate water loss from leaves of plants.
Proceed as follows:

Detach a leaf from CS4 and weigh immediately.

Place the leaf on a white tile and place where air blown by a fan reaches.
Weigh the leaf again at 5 minutes interval for the next 25 minutes and record
the mass of the leaf at each stage in the table below.

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@

Time (mins) Mass (g)

Start 0

5

10

15

20

End 25

(ii) | Using an appropriate scale, plot the graph of mass (g) versus time
(minutes).

(ii) | What conclusion can you draw from the graph?

[6]

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(b)

8

(iv) Outline any two environmental factors that can affect crop water loss.

Suggest how farmers can minimise water loss during harvesting, storage
and marketing of leaf crops.

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