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Agro 234: Weed Science Question Paper

Agro 234: Weed Science

Course:Bachelor Of Science In Agriculture

Institution: Chuka University question papers

Exam Year:2013

CHUKA

UNIVERSITY

UNIVERSITY EXAMINATIONS
SECOND YEAR EXAMINATION FOR THE AWARD OF
DEGREE OF BACHELOR OF SCIENCE IN AGRICULTURE
AGRO 234: WEED SCIENCE
STREAMS: BSC (AGRIC) Y2S2 TIME: 2 HOURS
DAY/DATE: MONDAY 12/8/2013 11.30AM – 1.30 PM
INSTRUCTIONS:

1. Label your answer clearly
2. Don’t mix up answers.

Answer all Questions in Section A and Any Two in Section B

SECTION A

QUESTION ONE

(a) Define the term weeds mimicry. [2 Marks]

(b) With relevant examples, explain three types of weed mimicry. [9 Marks]

QUESTION TWO

State five characteristics of weeds which make them successful in most environments.
[4 Marks]
QUESTION THREE

Define allelopathy and explain how allelopathic substance enters the environment. [8 Marks]

QUESTION FOUR

(a) List various criteria used in weeds classification [2 Marks]

(b) Briefly explain how to carry out a starvation test when using a biological weed agent to control weed. [4 Marks]

SECTION B

QUESTION FIVE

(a) State five advantages of chemical weed control. [5 Marks]

(b) Describe the procedures used in classical biological weeds control, give one example where this method has been successfully used. [15 Marks]

QUESTION SIX

(a) State four favorable internal conditions required for weed seed germination.
[4 Marks]

(b) Discuss four natural means of weeds dissemination. [16 Marks]

QUESTION SEVEN

Explain five environmental factors that affect foliar absorption of herbicide by weed.
[20 Marks]

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Agro 234: Weed Science Question Paper

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