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Date May 2021 Marks available 8 Reference code 21M.1.SL.TZ0.1
Level SL Paper 1 Time zone no time zone
Command term To what extent Question number 1 Adapted from N/A

Question

Automatic crop watering system

Since 1990, Bertha Ascayo has been the manager of El Pallar, a farm in Chacra Province, where fruit trees are grown. In recent years, the climate has become more unpredictable, and the farm has suffered from periods of drought. Bertha is aware that she now needs to manage the watering of her fruit trees more than she has had to in the past.

Bertha will need to make some improvements to the watering system by adding a rain sensor and use a computer program to automate the watering process. She has chosen a company that uses open-source software. The same company also installed the equipment for the watering of the trees.

By using this software, Bertha can program a different watering plan for each type of tree. This includes programming the days of the week, times of the day, and length of the water cycle for each type of tree to be watered. For example, orange trees will be watered on Mondays and Thursdays at 6am for 45 minutes and at 8pm for 30 minutes.

Identify three characteristics of open-source software.

[3]
a.i.

A computer program uses data provided by a rain sensor to decide whether to water the trees. Identify three ways how the algorithm may be represented.

[3]
a.ii.

Water is becoming increasingly scarce in Chacra Province, and the provincial government is concerned there will be a point when there is not enough water for all of the farms to water their crops or fruit trees.

To manage water for the watering of crops and fruit trees, the provincial government of Chacra Province intends to use computer modelling to calculate how much water each farm in the province will receive.

Explain three factors that will contribute to the accuracy of this computer model.

[6]
b.

The farmers of Chacra Province are concerned about the provincial government using a computer model to determine the amount of water they will be allowed to use to water their fruit trees.

To what extent should the farmers of Chacra Province rely on their knowledge and experience, rather than the computer-based solution provided by the provincial government, to manage the watering of the fruit trees?

[8]
c.

Markscheme

Answers may include:

 

Award [1] for identifying each characteristic of open-source software up to a maximum of [3] marks.

a.i.

Answers may include:

 

Award [1] for identifying each way the algorithm may be represented up to a maximum of [3] marks.

a.ii.

Answers may include:

 

Award [1] for identifying a factor that will contribute to the accuracy of the model and [1] for explanation why that will contribute to the accuracy of the model up to maximum of [2] marks.

OR

Award [1] for each example given and an additional [1] if the explanation contributes to the accuracy of the model up to a maximum of [2] marks.


Mark as [2] + [2] + [2].

b.

Answers may include:

Knowledge and experience will:

Use of the provincial model will:

Use of the computer system will:

 

In part (c) of this question it is expected there will be a balance between the terminology related to digital systems and the terminology related to social and ethical impacts.

Keywords: agriculture, ecosystems, algorithm, accuracy, reliability, model, modelling, judgement, automation, change, power, systems, ethics, values

 

Refer to SL/HL paper 1, part c markbands when awarding marks. These can be found under the "Your tests" tab > supplemental materials > Digital society markbands and guidance document.

c.

Examiners report

[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.
[N/A]
c.

Syllabus sections

Topic 2: Concepts » 2.1 Change
Show 58 related questions
Topic 3: Content » 3.1 Data
Topic 3: Content » 3.2 Algorithms
Topic 4: Contexts » 4.3 Environmental
Topic 2: Concepts » 2.4 Power
Topic 2: Concepts » 2.6 Systems
Topic 2: Concepts » 2.7 Values and ethics
Topic 2: Concepts
Topic 3: Content
Topic 4: Contexts

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