Which of the following is a foreign substance that can be added to pure honey to prepare impure honey?

Which substance is commonly added to pure milk to adulterate it?

What is the purpose of air-drying soil samples at room temperature for 2 to 3 days?

After air-drying, soil samples can be ground and passed through a sieve of what size for laboratory analysis?

The procedure described for soil sample preparation does not apply to which of the following?

The text describes procedures for preparing soil samples for laboratory analysis and for preparing impure honey and adulterated milk. (a) Outline the steps for preparing a composite soil sample of up to 1 kg. (b) List four foreign substances that can be added to pure honey to make it impure. (c) List four substances that can be added to pure milk to adulterate it. (d) Why is it important to ensure the drying room is free from sample contaminating factors?

1. List four types of tools and equipment used for soil sampling. (4 alama)
2. Outline the steps for preparing a composite soil sample of up to 1 kg. (3 alama)
3. List four foreign substances that can be added to pure honey to make it impure. (2 alama)
4. Lubricate the blade after use. (1 alama)
5. Oil the handle. (1 alama)
6. List four substances that can be added to pure milk to adulterate it. (2 alama)
7. Why is it important to ensure the drying room is free from sample contaminating factors? (1 alama)
8. Sharpen the saw (1 alama)

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Describe how to prepare a composite soil sample.

1. Regular cleaning of the sprayer. (1 alama)
2. Describe how to prepare a composite soil sample. (6 alama)
3. Check for blockage. (1 alama)
4. Regular inspection of the spray tank, pump, hoses and nozzle tips. (1 alama)
5. Lubricate the moving parts. (1 alama)

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Explain the purpose of air drying soil samples.

1. Land preparation (2 alama)
2. Explain the purpose of air drying soil samples. (2 alama)
3. Seed selection (1 alama)
4. Planting (2 alama)
5. Fertilizer application (1 alama)
6. Pest and disease control (1 alama)
7. Weed control (1 alama)

Boresha ili kuona majibu ya mfano.

List four foreign substances that can be added to pure honey to make it impure.

1. List four foreign substances that can be added to pure honey to make it impure. (4 alama)
2. Colony management (2 alama)
3. Honey harvesting (2 alama)

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Name four substances used to adulterate milk.

1. Procedure (3 alama)
2. Name four substances used to adulterate milk. (4 alama)

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Soil sampling for agricultural purposes provides a means to obtain a representative soil sample for making inference of various soil characteristics in the particular land area. A soil sample represents a particular soil type with unique characteristics. The validity and quality of the soil data obtained from soil sample testing or observation depends on the quality of the soil sample. In the Agricultural Science subject, soil sampling is a necessary activity for obtaining quality soil samples that can be used for various soil science practical activities in learning or assessing soil physical, chemical and biological properties.

1. Procedure (3 alama)
2. State the main purpose of soil sampling for agricultural purposes. (2 alama)
3. What does a soil sample represent? (1 alama)
4. On what does the validity and quality of soil data depend? (1 alama)
5. List three types of soil properties that can be assessed using soil samples in Agricultural Science. (3 alama)

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There are different types of soil samples, depending on the desired soil characteristic(s). For example, undisturbed top soil samples (core samples) are used to measure soil bulk density, while disturbed top soil samples are commonly used for assessing several physical, chemical and biological soil characteristics. The latter are also commonly used for practical purposes in the Agricultural Science subject for O-level and A-level secondary schools in Tanzania.

1. Name two types of soil samples and their uses. (4 alama)
2. Which type of soil sample is commonly used for practical purposes in Agricultural Science in secondary schools in Tanzania? (2 alama)
3. Storage (1 alama)

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Important tools and equipment for soil sampling  Auger, hand hoe and or spade for taking soil sample from the ground.  A bucket for mixing of soil subsamples before packaging.  A pencil, its sharpener and rubber for labeling sample on paper ID.  A paper sample ID and note book.  A permanent marker pen for labeling on the sampling bag.  Rope.  Polythene sampling bags (1 kg capacity).  50 kg bags for storage of soil samples.

1. List any four tools and equipment used for soil sampling. (4 alama)
2. What is the function of a bucket in soil sampling? (1 alama)
3. What is the capacity of polythene sampling bags? (1 alama)
4. What are 50 kg bags used for? (1 alama)

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Top soil sampling procedure for soil science practical (i) Identify a suitable location with the required soil type e.g. instructed soil colour and texture. (ii) Conduct a reconnaissance field survey and identify soil variations based on slope, vegetation cover, soil colour, soil texture and or current or previous cropping history. Identify the most dominant factor(s) contributing to soil variation and proceed with step (iii). (iii) Divide the land area into different soil sampling units based on the observed dominant soil variations. Each unit represents a particular soil type based on (ii) above. (iv) Decide on the sampling pattern to be used for collecting soil samples from each sampling unit. The sampling pattern can be random or systematic. (v) For each sampling unit, use the selected soil sampling pattern to collect the top soil composite soil sample at a depth of 0 – 30 cm. The composite soil sample is the most representative sample that can be obtained as follows: ● at each point in the particular soil sampling unit, remove the surface debris and organic materials at about 2 – 3 cm depth before digging; ● collect a soil subsample using auger, hand hoe or spade at 0 – 30 cm and put it in the bucket; ● move to the next point within the particular sampling unit and repeat the above activity for several points to make 5 up to 20 soil subsamples; ● mix the subsamples thoroughly and remove any none soil materials like rocks, worms and roots;

1. What is the first step in top soil sampling procedure? (1 alama)
2. List any three factors that should be considered during a reconnaissance field survey for soil sampling. (3 alama)
3. How should the land area be divided for soil sampling based on observed variations? (2 alama)
4. What are the two types of sampling patterns that can be used? (2 alama)
5. At what depth should the top soil composite sample be collected? (1 alama)
6. Describe how to collect a composite soil sample. (3 alama)
7. What should be done before digging to collect a soil subsample? (1 alama)

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Explain the importance of conducting a reconnaissance field survey before soil sampling.

1. Explain the importance of conducting a reconnaissance field survey before soil sampling. (5 alama)
2. Describe the expected observation for pure honey in the water test. (1 alama)
3. Describe the expected observation for impure honey in the water test. (1 alama)
4. State two reasons why item (v) is crucial. (2 alama)
5. Mention the two categories of equipment that must be ensured to be available as stated in item (viii). (2 alama)

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Differentiate between disturbed and undisturbed soil samples, mentioning their uses.

1. Differentiate between disturbed and undisturbed soil samples, mentioning their uses. (5 alama)
2. Thumb Test: Property and outcome for pure honey. (2 alama)
3. Blotting Paper or Paper Towel Test: Property and outcome for pure honey. (2 alama)
4. State the difference in handling animal and plant specimens as described in item (iv). (2 alama)
5. Item (vi) suggests improvising apparatuses. Give one example of when this might be necessary and how it could be done. (3 alama)

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Describe the process of preparing a uniform soil sample type for all students as mentioned in the text.

1. Describe the process of preparing a uniform soil sample type for all students as mentioned in the text. (4 alama)
2. What is the primary characteristic of pure honey that would affect its flammability? (1 alama)
3. What common adulterant would likely hinder the matchstick from lighting? (1 alama)
4. State the expected outcome for pure honey in the fire test. (1 alama)
5. Suggest two reasons why it is important to store apparatuses, equipment, chemicals and materials safely after the examination (item viii). (3 alama)

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Why are soil profile samples and samples for examining soil structure and colour prepared using a special procedure?

1. Why are soil profile samples and samples for examining soil structure and colour prepared using a special procedure? (3 alama)
2. Industrial application 1: (1 alama)
3. Industrial application 2: (1 alama)
4. Name two components of soil that require oxygen for respiration. (2 alama)
5. What is the basic component of soil mentioned in the overview? (1 alama)

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