Ypu are provided with specimen C as a sample brought to the plant clinic by a farmer. Carefully examine the specimen as plant pathologists and inform the farmer on the following: (a) Name of the disease affecting specimen C. (b) Causative agent of the disease by its common and scientific names. (c) Three modes of transmission of the disease. (d) Three observable symptoms that exhibit the presence of the disease.

1. Name of the disease affecting specimen C. (0 mk)
2. Causative agent of the disease by its common and scientific names. (0 mk)
3. Three modes of transmission of the disease. (0 mk)
4. Three observable symptoms that exhibit the presence of the disease. (0 mk)

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iv) Add distilled water and few drops of pH colour indicator/ dyer to the mixture of both specimen S1 and specimen S2. v) Cork the test tubes and shake the mixture vigorously to ensure thorough mixing. vi) Allow the content to stand for 45 minutes. vii) Observed the clear area formed in the middle of the test tubes. viii) Match the colour of the solution with that of colour chat and record the pH value.

1. Give the aim of the experiment (0 mk)
2. Give the values and names of the pH range in each of the specimen S1 and S2. (0 mk)
3. Briefly describe the process involved in the experiment (0 mk)
4. Assess the significance of conducting the experimental test in crop production, (0 mk)
5. Suggest one common crop in Tanzania suitable to be grown in the soil sample of specimen S1 with regard to its pH value. (0 mk)
6. Comment on the status of each of the specimen L1 and L2, giving two signs in each case to justify the status of the specimens. (0 mk)
7. Give three factors to be considered for the specimen that has passed the test not to suit the purpose of the experiment (0 mk)
8. Give reason why the barium sulphate powder was added to the specimens during the experiment, (0 mk)
9. Briefly explain why yolkers and quitters cannot be winner specimens in the experiment. (0 mk)
10. Give comments and advice to farmers who want to grow maize in the soil of specimen S2. (0 mk)
11. Account for the five necessary conditions for artificially developing the winner specimens in the experiment. (0 mk)
12. Briefly explain three importance of advice given in part (e). (0 mk)

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You are provided with specimen C as a sample brought to the plant clinic by a farmer. Carefully examine the specimen as plant pathologists and inform the farmer on the following:

1. Measure about 5g for each of specimen S1 and specimen S2. (1 mk)
2. Give the values and names of the pH range in each of the specimen S1 and S2. (0 mk)
3. Name of the disease affecting specimen C. (0 mk)
4. Put the measured specimen S1 and specimen S2 into separate test tubes (1 mk)
5. Assess the significance of conducting the experimental test in crop production, (0 mk)
6. Causative agent of the disease by its common and scientific names. (0 mk)
7. Using spatula, add barium sulphate powder and mix it well with both specimen S1 and specimen S2 (1 mk)
8. Three modes of transmission of the disease. (0 mk)
9. Suggest one common crop in Tanzania suitable to be grown in the soil sample of specimen S1 with regard to its pH value. (0 mk)
10. Three observable symptoms that exhibit the presence of the disease. (0 mk)
11. Give reason why the barium sulphate powder was added to the specimens during the experiment, (0 mk)
12. One measure that can be employed to restore the health of the infected plant. (0 mk)
13. Give comments and advice to farmers who want to grow maize in the soil of specimen S2. (0 mk)
14. Briefly explain three importance of advice given in part (e). (0 mk)
15. Six points to suggest ways to maintain health of the plant against the disease. (0 mk)

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