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Kst 304:Weed Science And Management. Question Paper

Kst 304:Weed Science And Management.

Course:Bachelor Of Science In Agriculture

Institution: Kenyatta University question papers

Exam Year:2013

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2012/2013
SECOND SEMESTER EXAMINATION FOR THE BACHELOR OF SCIENCE IN CROP IMPROVEMENT AND PROTECTION
KST 304:WEED SCIENCE AND MANAGEMENT.
DATE:10/4/2013
TIME:8.00-10.00 AM

INSTRUCTIONS

Answer all questions in section A and any 2 questions in section B.
Section A(40 marks)

1.a.Define a weed.[1 mark]
b.List any 4 characteristics of weed plants.[2 marks]
c.List any 4 main structures of asexual reproduction in weeds.[2 marks]

2.Weeds have ability to compete well with crops.Outline how this is possible in terms of growth resource capture and photosynthetic pathways.[5 marks]

3.Briefly outline five key ways through which weeds lead to reduced yield losses in crops.[5 marks]

4.Define the following terms and show them in one graph using an hypothetical scenario of time and relative yield.[5 marks]
a)Critical weed free requirement.
b)Critical timing of weed control.
c)Critical period of control.

5.Outline five major ways in which weeds are categorized.[5 marks]

6. a)What is weed eradication? [1 marks]
b)List four reasons why weed eradication is difficult. [2 marks]
c)Define weed management. [2 marks]

7.Compare the following: [5 marks]
a)Trade name Vs chemical name.
b)Residual vs non-residual herbicides.
c) Systemic vs contact herbicides.
8.Enumerate five broad categories of weed control measures.[5 marks]

SECTION B(30 MARKS)
9.Discuss the "reality of biological control" in weed management.[15 marks]

10.Outline the fate of herbicides applied to plants and differentiate between apoplastic and symplastic trans-location of herbicides.[15 marks]

11.Define herbicide and discuss the herbicide,biological and management factors that may lead to development of an herbicide resistant weed population. [15 marks]

12.Name any 5 grass and any 5 broad leaved weed species citing both their common and scientific names and describe the probable causes of poor performance of mechanical weed control.[15 marks]

Kst 304:Weed Science And Management. Question Paper

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