(a) Name the engine component which converts reciprocating motion to rotary motion. (b) Identify eight systems which are commonly found on a tractor engine and give a function for each. (c) Briefly describe the operations of petrol and diesel fuel engines. (d) Outline the function of each of the following components of battery ignition system in a petrol fuel engine: (i) coil (ii) distributor (iii) condenser (iv) spark plug and (v) battery.

1. Name the engine component which converts reciprocating motion to rotary motion. (1 mk)
2. Identify eight systems which are commonly found on a tractor engine and give a function for each. (8 mk)
3. Briefly describe the operations of petrol and diesel fuel engines. (3 mk)
4. Outline the function of each of the following components of battery ignition system in a petrol fuel engine: (i) coil (ii) distributor (iii) condenser (iv) spark plug and (v) battery. (3 mk)

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(a) (i) Give the meaning of the term protective gears as used in farm workshop. (ii) Describe five protective gears used in the farm workshop. (b) (i) Suggest three main safety precautions to be considered in a farm workshop. (ii) Briefly explain the use of a fire extinguisher in the farm workshop. (c) Account for six factors to be considered when siting a farm workshop.

1. (ii) Describe five protective gears used in the farm workshop. (5 mk)
2. (ii) Briefly explain the use of a fire extinguisher in the farm workshop. (2 mk)
3. Account for six factors to be considered when siting a farm workshop. (4 mk)

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(a) Differentiate (i) concrete block and mud brick (ii) concrete and mortar (iii) foundation and footing (b) Briefly explain three factors influencing the design of farm structures. (c) Enumerate six features of a good storage structure. (d) Suggest five farm structures and for each give its importance to farmers.

1. (iii) foundation and footing (2 mk)
2. Briefly explain three factors influencing the design of farm structures. (3 mk)
3. Enumerate six features of a good storage structure. (3 mk)
4. Suggest five farm structures and for each give its importance to farmers. (4 mk)

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(a) Compare a seed drill with a planter (b) Briefly explain seven functions of the seed drill components (c) Elaborate four functions of double mouldboard plough. (d) Briefly describe the mode of operation performed by a combine harvester.

1. Compare a seed drill with a planter. (3 mk)
2. Compare a seed drill with a planter (0 mk)
3. Briefly explain seven functions of the seed drill components. (7 mk)
4. Briefly explain seven functions of the seed drill components (0 mk)
5. Elaborate four functions of a double mouldboard plough. (4 mk)
6. Elaborate four functions of double mouldboard plough. (0 mk)
7. Briefly describe the mode of operation performed by a combine harvester. (1 mk)
8. Briefly describe the mode of operation performed by a combine harvester. (0 mk)

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(a) Enumerate three equipment used to carry out overhead irrigation at the home garden (b) Explain the following surface irrigation methods (i) free flooding (ii) checks (iii) boarders (iv) basin (v) furrow (c) Outline seven factors to be considered when operating sprinkler irrigation system.

1. Enumerate three equipment used to carry out overhead irrigation at the home garden (0 mk)
2. Enumerate three equipment used to carry out overhead irrigation at the home garden. (3 mk)
3. Explain the following surface irrigation methods: basin (0 mk)
4. (v) furrow (1 mk)
5. Explain the following surface irrigation methods: furrow (0 mk)
6. Outline seven factors to be considered when operating sprinkler irrigation system. (0 mk)
7. Outline seven factors to be considered when operating a sprinkler irrigation system. (7 mk)

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(a) Define the term weathering as used in soil formation (b) Briefly explain two types of rock weathering and show how they relate to each other (c) Explain the four main agents of weathering work on rocks. (d) give one chemical equation in each case, explain any five processes involved in chemical weathering of rocks.

1. Define the term weathering as used in soil formation (0 mk)
2. Define the term weathering as used in soil formation. (2 mk)
3. Briefly explain two types of rock weathering and show how they relate to each other. (4 mk)
4. Briefly explain two types of rock weathering and show how they relate to each other (0 mk)
5. Explain the four main agents of weathering work on rocks. (8 mk)
6. Explain the four main agents of weathering work on rocks. (0 mk)
7. Give one chemical equation in each case, explain any five processes involved in chemical weathering of rocks. (6 mk)
8. give one chemical equation in each case, explain any five processes involved in chemical weathering of rocks. (0 mk)

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(a) Explain five factors affecting composition of farmyard manure. (b) briefly explain the following terminologies as used in fertilizer application: (i) fertilizer (ii) fertilizer analysis (iii) fertilizer grade (iv) fertilizer ratio. (c) outline any six function of essential plant nutrients.

1. Explain five factors affecting composition of farmyard manure. (0 mk)
2. Explain five factors affecting the composition of farmyard manure. (10 mk)
3. (iii) fertilizer grade (1 mk)
4. Briefly explain the following terminologies as used in fertilizer application: fertilizer ratio. (0 mk)
5. Outline any six function of essential plant nutrients. (0 mk)

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(a) study the given curves of different product - product relationships and describe the relationships between (i) Y1 and Y2, (ii) Y3 and Y4, (iii) Y5 and Y6, (iv) Y7 and Y8, (b) give the meaning of the following as used in production economics (i) production function (ii) total products (iii) average product (iv) marginal product (c) briefly explain two characteristics of each of the three regions of the production functions.

1. study the given curves of different product - product relationships and describe the relationships between Y7 and Y8 (0 mk)
2. give the meaning of the following as used in production economics: marginal product (0 mk)
3. briefly explain two characteristics of each of the three regions of the production functions. (0 mk)

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(a) (i) Give the meaning of the term oligopoly (ii) Give four characteristics of oligopoly market condition (b) briefly describe the following functions of marketing: (i) standardization (ii) financing (iii) risk bearing (iv) market intelligence (v) price setting. (c) give the difference between black market and open market.

1. Give four characteristics of oligopoly market condition (0 mk)
2. Briefly describe the following functions of marketing: market intelligence (0 mk)
3. Briefly describe the following functions of marketing: price setting. (0 mk)
4. give the difference between black market and open market. (0 mk)

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