6.1 The pictures below show TWO types of irrigation systems (A and B) - NSC Agricultural Technology - Question 6 - 2018 - Paper 1
Question 6
6.1 The pictures below show TWO types of irrigation systems (A and B).
State THREE advantages of system A over system B.
6.2 Name THREE data sources that the irrig... show full transcript
Worked Solution & Example Answer:6.1 The pictures below show TWO types of irrigation systems (A and B) - NSC Agricultural Technology - Question 6 - 2018 - Paper 1
Step 1
State THREE advantages of system A over system B.
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System A is less expensive to install than system B.
It consists of sections that can be easily disconnected, allowing for repairs and replacements.
System A is versatile, being suitable for small or square-shaped fields, making it more adaptable.
Step 2
Name THREE data sources that the irrigation management mechanism – smart controller – uses to determine local weather conditions.
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Soil sensor for determining moisture levels.
Rain sensors to detect precipitation.
Weather stations that provide forecasts and current weather data.
Step 3
Recommend what a farmer should consider before choosing a type of irrigation system for a piece of land.
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The size of the area to be irrigated must be assessed for type compatibility.
The shape of the land can influence the choice of system, especially if it's irregular.
The availability of water must be evaluated to determine what system may work best.
Step 4
Name THREE instances where flood irrigation would be preferred over sprinkler irrigation.
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When water supply is abundant, flood irrigation can be easier to manage.
When the landscape is flat and cannot lead to erosion, flood irrigation is suitable.
When the soil has good water absorption, flood irrigation can be effective.
Step 5
Identify the mistakes in the design drawing of the septic tank above.
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The inlet must be higher than the wall to prevent overflow.
The outlet should be lower than the inlet to ensure proper drainage.
Step 6
Name THREE items that must NOT be flushed down a septic tank drainage system.
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Plastics or non-degradable materials should be avoided.
Oils or fatty substances that can clog the system.
Bleaches and disinfectants that can disrupt bacterial action.
Step 7
What will happen in a septic tank drainage system if the bacteria are destroyed?
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The system will function merely as a holding tank for waste.
It will fill up with waste and will no longer decompose naturally.
Step 8
Name TWO factors that determine the cleaning of a septic tank.
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The amount of waste water entering the system daily.
The frequency of solid waste disposal from the system.
Step 9
Calculate the flow rate (litres per minute) in a water-delivering system if it takes 40 minutes to fill a 20 kℓ (kilolitre) tank to the top.
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Give ONE function of EACH of the following devices:
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6.8.1 GPS: It pinpoints exact positioning down to one meter.
6.8.2 GIS: It shows areas of under or over watering by mapping land use.
6.8.3 VRT: Variable Rate Technology helps to apply resources variably based on specific field conditions.
Step 11
Name TWO components of the whole house water filtering system that must be checked and replaced on a regular basis.
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Filter elements or cartridges that need routine replacement.
O-rings that prevent leaks and must be checked regularly.
