GPB 201: Principles of Plant Breeding (2+1)

University of Agricultural Sciences Bangalore
Department of Genetics and Plant Breeding, College of Agriculture, GKVK

Mid-term Examination
GPB 201: Principles of Plant Breeding (2+1)
II Year BSc (Agri); I Semester of 2010-2011
Date: 01-09-2010

Maximum Marks: 20
Duration: 45 Minutes

---

I. State True or False 0.5 Marks each

1. Hetero-styly promotes cross pollination

2. F₁ plants between two pure-line varieties are characterized by heterozygous and homogeneous population

3. Acclimatization is the process of adaptation of an introduced crop variety

4. Male-sterility promotes self-pollination

5. Mode of pollination helps in deciding type of breeding method to be followed for genetic improvement of crop plants

6. Frequency of Induced mutations is lower than those of natural mutations

7. Hybridization is a method of creating genetic variability

8. F₁ population between two heterozygous parents will have more genetic variability than that of F₂ population derived from crossing two genetically dissimilar homozygous parents

9. Physical mutagens are more powerful than those of chemical mutagens

10. Most induced mutations are recessive in phenotypic expression

11. Increased expression of F₁ progeny between two genetically dissimilar parents is known as heterosis

12. Monoecious plants always produce unisexual flowers at different positions of plants

13. Crop life cycle is one of the factors that determine the extent of acclimatization

14. Failure of fertile pollen grains from a plant to fertilize ovule of the same plant is called as male-sterility

15. NBPGR is the nodal agency in India that coordinates the introduction of new crops or new cultivars of established crops

16. IR 8 is a classical example for primary introduction

17. Male-sterile plants always produce non-functional pollen grains

18. Pedigree selection is a method of handling segregating population

19. Selection operates on variation caused by genetic and environment factors

20. Genetic variability is pre-requisite for making selection of desirable plants

---

II. Answer the following

1. Mention and define different types of male-sterility 2.00

2. Mention and define types of plant introduction 2.00

3. Mention different factors that determine plant introduction 2.0

4. Mention mechanisms favoring self pollination 2.00

5. Define self-incompatibility and male-sterility 2.00