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1.1
1.1.1
1.1.2
1.1.3The diagrams below represent two different clay minerals marked A and B. Which ONE of the following statements with regard to the above diagrams is TRUE? A Clay mineral A has a higher cation adsorption capacity (CAC\
1.1.4The following diagram illustrates two equal bundles of radiation from the sun reaching the earth at different positions. Choose the statement below that best describes the difference in soil temperature due to the degree of latitude.
1.1.5
1.1.6Genetic engineering and genet ically modified organisms (GMO\ are transforming new breeds of crops for the agricultural industry. ONE of the following statements is NOT associated with GMO crops: A Most GMO crops render higher yield than conventional crops.
1.1.7At a recent Agricultural Expo a patent for a unique small plough was exhibited. It can be used to till soil by a pushing action from the operator. This plough was developed from knowledge gained from primitive ploughs used by indigenous people. This plough
1.1.8
1.1.9
1.1.10
1.2.5A process where new compounds are formed during decomposition That quantity of water that is held at a moisture tension between field water capacity and wilting A pest that mainly damages the root system of
1.2
1.3
1.3.1The soil water content where plants do not get enough water for their transpiration needs but recover during the night
1.3.2The term that describes the attraction of cations to the negative surface of clay colloids
1.3.3The joining of the stem of one plant to the buds of another enabling them to grow together as one
1.3.4The type of weed control done by rural women using a hoe to clean their maize fields around their homesteads
1.3.5A system of agricultural producti on that involves the use of advanced technology including computers and satellite images to optimise farming operations (5 x 2\
1.4
1.4.1When sodium is the predominant cation, the soil will be acidic.
1.4.2Autotrophic fungi in the soil refer to fungi which cannot produce their own food.
1.4.3Rhizomes are stems that grow just below the soil surface and form new plants along their nodes or joints.
1.4.4Insects that are responsible for the transmission of viral diseases in plants are called pathogens.
1.4.5Permaculture is a system of crop pro duction in a controlled environment without using soil as a growth medium. (5 x 1\ (5\ 45
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2.1Saline soils contain high levels of soluble salts. A soluble salt refers to a salt that readily dissolves in water. Some of these salts occur naturally from minerals in the rocks that have undergon e weathering, some from solutes in
2.1.2Describe THREE conditions that may lead to the formation of white- brack conditions by referring to the information and pictures above. (3\
2.1.3Using the pictures, state TWO disadvantages of white-brack conditions on crop production. (2\
2.1.4Explain how a farmer can prevent or control the situation as illustrated in the pictures. (4\
2.1.5Name a fertiliser that is used mainly to correct a high level of sodium in the soil. (1\
2.1.6Draw a simple schematic representation of the exchange reaction that takes place when the fertiliser ment
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2.2The schematic representation below illustrates a process that occurs in some of the cells of a plant.
2.2.1State the process that is illustra ted in the schematic representation.(1\
2.2.2Name the labels indicated by liquid A, gas B and gas C in the schematic representation. (3\
2.2.3Name the organelle labelled D in the above representation. (1\
2.2.4Discuss the growth rate of plants at different concentration levels of gas B. (2\ CALVIN CYCLE liquid A gas B Gas C Growth rate Concentration of gas B
2.3The graph below represents the broadcasting of fertilisers compared to the band placing of fertilisers at different fertiliser rates.
2.3.1Briefly explain the practice of broadcasting a fertiliser. (2\
2.3.2State the variable against which the fertiliser rate is compared in the graph for band placing and broadcasting of fertilisers. (1\
2.3.3Name a soil condition where the band placing of fertilisers would be more suitable than the broadcasting of fertilisers. Explain your answer. (2\
2.3.4With reference to the graph, compare the band placing of fertilisers to the broadcasting of fertilisers. (2\
2.4Read the following passage about no-till and answer the questions that follow. No-till practices in crop production have taken root all around the world, transforming dust bowls into productive land. Crop production is made
2.4.1State the difference between the above-mentioned tillage practice and conventional tillage practices. (2\
2.4.2Convince local vegetable growers in your area to adopt this tillage practice by indicating at least ONE advantage of using this tillage practice with regard to the following: (a\ Economic (b\ Crop (2\
2.5Livestock enterprises are not the only agricultural enterprises that impact on the natural vegetation. List THREE other enterprises that have greater impact on the natural vegetation. (3\ [35] START THIS QUESTION ON A NEW PAGE.35
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3.1A soil scientist gathered the data below. It represents part of a soil profile form (data recording sheet\at was used while he was doing some field work. Sonto Soil Surveyance: Soil profile form Location: 113B (Mpumalanga\
3.1.1Name THREE different factors that determine the development of a homogenous colour (red\ in soil. (3\
3.1.2Describe at least FOUR interpretations that could be made from the colour of the soil above. (4\
3.1.3Explain why the clay % in the subsoil increases. (2\
3.1.4The structural development of the soil is very poor. Name TWO ways to improve the structure. (2\
3.1.5Use the data supplied above and state measures a farmer has to take with regard to the following: (a\rtilisation (b\n (1\ (2\
3.2A small fruit farmer wants to plant an orchard of plum trees. He learned that the process of cross-pollination is essential for effective pollination and fruit setting of plum trees. He consults with many experts and other farmers in the same
3.2.1Give a possible reason for the inclusion of cultivar B in this orchard. (1\
3.2.2Justify the even distribution or placement of the cultivar B trees in this orchard. (1\
3.2.3Give TWO possible reasons for placing beehives in this orchard. (2\
3.2.4Give a reason why the spacing between rows is larger than the spacing in the rows. (2\
3.2.5State a natural growth process in the plant that is influenced by the spacing of the individual plants of a crop. (2\
3.2.6Apart from spacing, which other TWO measures could this small farmer consider for improvement of the natural process mentioned
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3.3The following graph shows expenditure on insecticides, fungicides and herbicides (including veterinary products\ in a region of the world where modern agriculture and mechanisation are practised. From 1995 many
3.3.1Describe the difference between a and a herbicide . (2\
3.3.2Indicate the farm chemical that had the biggest increase in expenditure from 1995 to 1998. Give a possible reason for this tendency. (2\
3.4You have recently started a soil surveyance business. Design a page which will market your service. Use the following headings:
3.4.1Aim of the survey (1\
3.4.2SIX steps taken during the surveying process (6\ [35] (millions\ Year Herbicides Insecticides Veterinary products Fungicides 900 80035
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4.1The photograph below indicates soil bacteria that play an important role with regard to the nitrogen balance in soil.
4.1.1Name the type of bacteria that has formed inside the root nodules. (1\
4.1.2Give TWO examples of plants where the relationship illustrated above can be found. (2\
4.1.3State and describe the type of symbiosis that exists between the bacteria and the roots of the above plant. (2\
4.1.4In your own words, summarise the process that takes place in the root nodules. (4\
4.2A group of Agricultural Sciences learners decided to do a unique project for their formal research task. Their topi c was on the impact of agricultural practices on soil organisms. The group identified three different locations on the school grounds:
4.2.1Calculate the average number of earthworms for location B (with the highest average\ocation A (with the lowest average\ Write down only the answers. (2\
4.2.2The earthworms were used as an indicator for the total number of organisms in the soil. Explain the differences in the number of organisms in the soil by referring to the data produced by the group. (2\
4.2.3This group wants to make a recommendation to the school gardener based on their results. State ONE such possible recommendation that is based on their results. (1\
4.3A crop farmer has to plan his fertilisation programme. Assist this farmer by using the following data:
4.3.1Recommend a suitable fertiliser available in the storeroom of this farmer for each of the following situations. Give a reason for your answer in each case. (a\ (b\ (c\ A nitrogen fertiliser that can be applied through a centre-
4.3.2State the required nitrogen application needed in kg/ha for a 400 mm and a 550 mm rainfall scenario. Give TWO reasons for the difference in values for these rainfall scenarios. (4\
4.3.3Nitrogen levels in the soil are not mentioned in a soil analysis report. Give a reason for not adding the nitrogen levels in this report. (1\
4.3.4Calculate the percentage of nitrogen (N\in the fertiliser mixture (in the storeroom\. Show ALL your calculations. (3\ The following fertilisers are available in the storeroom of this farmer: Rock phosphate
4.4.1Name each of these systems, marked A and B, as illustrated above. (2\
4.4.2Use the information in the table provided above and redraw the bar graph below. This graph will then be assessed for the following Heading Indicators Descriptors/Labels Neatness, size and proportion (5\
4.4The following pictures illustrate two different irrigation systems, marked A and B. The table that follows represents the efficiency of water use ratings measured for the different irrigation systems.
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1.4.5Agricultural Sciences/P1 18 D oE/November 2008 NSC Copyright reserved ANSWER SHEET EXAMINATION NUMBER:
1.1.10A B C D (10 x 2\ (20\ TOTAL SECTION A: 45
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1.2.5(5 x 2\(10\
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