Ahs 2203:Weed Science Question Paper
Ahs 2203:Weed Science
Course:Bachelor Of Horticulture
Institution: Meru University Of Science And Technology question papers
Exam Year:2013
QUESTION ONE – 30 MARKS
a. Define the following terms: i. Weed science (1 Mark) ii. Herbicide (1 Mark) iii. Chemical name (1 Mark) b. State and explain any three characteristics of weed plants. (6 Marks) c. Using diagrams differentiate between critical weed free requirement and critical timing of weed removal. (6 Marks) d. Weeds are problem in water management, explain. (4 Marks) e. Explain how weeds infestation in a farm limits the crop rotation choices in the farm. (2 Marks) f. Briefly explain the two methods used for classifying weeds according to the human value. (2 Marks) g. Differentiate between eradication and weed management as methods of weed control. (2 Marks) h. Explain the five prevention weed control methods. (5 Marks)
QUESTION TWO – 20 MARKS
a. What is an apoplast? (2 Marks) b. Give a detailed explanation of how apoplastic translocation takes place in plants. (10 Marks) c. Define the following terms: i. Susceptibility (1 Mark) ii. Tolerance (1 Mark) iii. Selectivity (1 Mark) d. What is a safener as used in chemical weed control? (2 Marks) e. Weeds can be classified according to their life cycles. Explain. (3 Marks)
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QUESTION THREE – 20 MARKS
a. Plant physiological factors affects herbicide selectively. Give a detailed account of this. (8 Marks) b. Pesticides interactions affects herbicide selectively. Explain. (6 Marks) c. Weeds reduces harvesting efficiency. Explain. (4 Marks) d. State any two artificial dispersal methods for weeds. (2 Marks)
QUESTION FOUR – 20 MARKS
a. Differentiate between intraspecific competition and interspecific completion as used in weeds. (2 Marks) b. Allelopathy is one way by which weeds cause direct losses to crop plants, explain. (3 Marks) c. Weeds reduce the quality of harvest crop products. Explain. (4 Marks) d. Explain the methods used by crop rotation to control weeds. (3 Marks) e. Explain any three water management methods used for controlling weeds. (2 Marks) f. Briefly explain how the following affects the effectiveness of herbicides: i. Plant intake (2 Marks) ii. Microbial degradation (2 Marks)
QUESTION FIVE – 20 MARKS
a. What is a mycoherbicide. (2 Marks) b. State any three disadvantages of biological weed control. (3 Marks) c. What is a systemic herbicide? (2 Marks) d. State any three characteristics of systemic herbicides. (3 Marks) e. What is a soil sterilant? (2 Marks) f. Name any three categories of sol stenlant. (3 Marks) g. What is volatilization as a method of herbicide loss. (1 Mark) h. State any four factors which affect the rate of volatilization loss. (4 Marks)
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