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Agro 222: Plant Breeding Question Paper

Agro 222: Plant Breeding

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 AGRICULTURE
AGRO 222: PLANT BREEDING
STREAMS: BSC (AGRIC) Y2S2 TIME: 2 HOURS
DAY/DATE: THURSDAY 8/8/2013 11.30AM – 1.30 PM
INSTRUCTIONS:

SECTION 1: ANSWER ALL QUESTIONS (30 Marks)

1. Explain the following:

(a) Any two ways in which crops have evolved from wild to domesticated species.
[2 marks]

(b) The importance of variation in crop breeding? [2 marks]

(c) Four ways to create variation. [2 marks]

(d) The two essential characteristics of a cultivar. [2 marks]

(e) Emasculation and selfing procedures during hybridization. [2 marks]

2. Differentiate between the following terms as relates to plant breeding:

(a) Selection and genetic drift. [2 marks]

(b) Linkage and homologous chromosomes. [2 marks]

(c) Vivipary and Agamospermy. [2 marks]
3. Write short notes on the following terms:

(a) Orthodox and Recalcitrant seeds. [2 marks]

(b) Incomplete penetrance and hybrid vigor/heterosis. [2 marks]

4. (a) Outline four mechanisms that can maintain variation in a species. [4 marks]

(b) Write short notes on the two forms of germplasm conservation in plants.
[6 marks]

SECTION B: Answer Only Two Questions in this Section, Each Question Carries 20 Marks.

5. (a) Explain the genetic basis of plant breeding. [5 marks]

(b) Describe the apomixes phenomenon in plant breeding and its importance.
[15 marks]

6. (a) What is Plant Protection Act and what does DUS stand for? [5 marks]

(b) Discuss breeding of diseases and insects resistance in plants. [15 marks]

7. (a) Discuss mass selection method of plant breeding in cross pollinated species. [5 marks]

(b) Critique biotechnology as a special technique in crop improvement in the
developing countries. [15 marks]

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Agro 222: Plant Breeding Question Paper

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