Agriculture · Paper 2 · 2021

3 questions 🇹🇿 NECTA ✓ Official NECTA answers

CSEE 🇹🇿 NECTA ✓ Official NECTA answers

Agriculture · Paper 2 · 2021

3 questions

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Questions (3)

Section B

1. 0 marks

Suggest suitable benefits from pH results that will favour plant growth in the field when applying sample D and give precautions farmers need to consider when working with chemicals A, B and C in the field environment.

(a) Tabulate the result of the experiments based on the observation 10 mk

(a) Tabulate the result of the experiments based on the observation Action to Sample Color Formulation litmus pH paper A B C D 4 mk

(e) Suggest six suitable benefits from pH results that will favour plant growth in the field when applying sample D. 0 mk

(b) What will happen if sample A, B and C are repeatedly applied in the same piece of land? 1 mk

(f) Give three precautions farmers need to consider when working with chemicals A, B and C in the field environment. 0 mk

(b) What will happen if sample A, B and C are repeatedly applied in the same piece of land? 5 mk

(f) Give three precautions farmers need to consider when working with chemicals A, B and C in the field environment. 0 mk

(d) Suggest with a reason the best chemical to be applied in a soil having more of sample A and C for optimum growth of plant. 5 mk

(d) Suggest with a reason the best chemical to be applied in a soil having more of sample A and C for optimum growth of plant. 2 mk

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2. 0 marks

You are provided with the following specimens and chemicals: P, U, T, I, Glyphosate and Paraquat. As plant doctors, observe carefully the given specimens and then answer the questions that follow: Experiment 1 Procedures (i) Use spanner number 12 and 13 to connect one end of each piece of material Z into positive and negative terminals of specimen W. (ii) Connect the other ends of pieces of material Z into positive and negative terminals of specimen X: Positive to positive and negative to negative terminals. (iii) Record what have you observed. (iv) Proceed with Experiment 2 Experiment 2 Procedures (i) Disconnect the two ends of material Z from specimen X. (ii) Make contact of two ends of disconnected material Z from specimen X. (iii) Record what you have observed. (iv) After finishing the experiment, loosen and remove material Z using spanner number 12 and 13 from specimen W.

(i) Why was it difficult to manage specimen P, U, T and I in the crop field? 3 mk

(a(i)) Why was it difficult to manage specimen P, U, T and I in the crop field? 0 mk

(ii) Which herbicide is suitable for eradicating specimen P, U, T and I? Give a reason 2 mk

(a(ii)) Which herbicide is suitable for eradicating specimen P, U, T and I? Give a reason. 0 mk

(a(iii) Why the other choice of herbicide is not recommended other than the one you have chosen in (ii)? 0 mk

(iii) why the other choice of herbicide is not recommended other than the one you have chosen in (ii)? 2 mk

((b)(i) Give the name and function of each specimen W and X. 0 mk

(a(iv)) Recommend the most appropriate growth stage of specimens P, U, T and I for maximum effectiveness of the proposed herbicides. 0 mk

(iv) Recommend the most appropriate growth stage of specimens P, U, T and I for maximum effectiveness of the proposed herbicides. 3 mk

((a)(i) Recommend the most appropriate growth stage of specimens P, U, T and I for maximum effectiveness of the proposed herbicides. 0 mk

(b(i)) What have you observed in both experiments? 0 mk

(b(ii)) What was the aim of the two experiments? 0 mk

(b(iii) How will you care and maintain specimen W to make sure that the aim of the two experiments in (ii) are met? Give five points to support your answer. 0 mk

(b(iv)) Give the name and function of each specimen W and X. 0 mk

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