Agric Science

ESSAY QUESTIONS. Answer FOUR Questions in all; One from each
1(a) What are the importance of soil texture in crop production? Give at least five.
(5 Marks)
(b) List and explain the effects of organic matter to crops. (10 Marks)

2 (a) Give reasons why weeds are difficult to control in farms. (5 Marks)
(b) List three and explain any 3 methods of controlling weeds. (10 Marks)
(a) Illustrate the nitrogen cycle. (5 Marks)
(b) Explain the terms Ammonification; Ammonization and nitrification in relation to
nitrogen cycle. (10 Marks)
(a) Make a large labeled diagram of a typical plant cell. (5 Marks)
(b) Explain the functions of the following organelles: (i) Plastids (ii) Mitochondrion and
(iii) Lysosome (10 Marks)

(a) What are the causes of soil acidity? (5 Marks)
(b) State any four effects of soil acidity to crops. (5 Marks)
(c) Explain the importance of liming in agriculture. (5 Marks)
(a) What is a nursery? (2 Marks)
(b) Mention the reasons for establishing a nursery in crop production. (4 Marks)
(c) With the aid of diagrams, illustrate the stages involved in budding of citrus. (9 Marks)

(a) What is seed in agricultural term? (5 Marks)
(b) Briefly explain the different classes of seeds (5 Marks)
(c) State the purpose of seed certification (5 Marks)

(a) Discuss the cultivation of maize under the following headings: origin, method of
propagation, climatic and soil requirements, land preparation and planting and
management. (6 Marks)
(b) How would you know maize plants affected by streak? (9 Marks)

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