Genetics Plant Breeding and Horticulture-October-2013

B.Sc. DEGREE (C.B.C.S.S.) EXAMINATION, OCTOBER 2013
Fifth Semester
Core Course – GENETICS, PLANT BREEDING AND HORTICULTURE
(Common for B.Sc. Botany Model I., Model II and B.Sc. Botany and Biotechnology (Double Core) 2011 Admission]
Time: Three Hours; Maximum Weight: 25

Part A (Objective Type Questions)
Answer all questions
Each bunch of four questions carries a weight of 1 (4 X 1 = 4)

 I. Multiple Choice Questions, Bunch I

1. Dihybrid F2 phenotypic ratio is
     a. 3 : 1
     b. 9 : 3 : 3 : 1
     c. 1 : 1 : 1 : 1
     d. 1 : 1

2. In monosomy the chromosome number is:
     a. 2n + 1
     b. 2n + 2
     c. 2n – 1
     d. 2n – 2

3. Plastid inheritance in Mirabilis was invented by:
     a. Correns
     b. Altman
     c. Winkler
     d. Jenkins

4. Which of the following is developed through mutation?
     a. Sonora-64
     b. TR-8
     c. Ganga 101
     d. None of these

II. Multiple Choice Questions, Bunch I

5. Sugarcane Breeding Institute is located at
      a. Pattambi
      b. Coimbatore
      c. Trivandrum
      d. Chennai

6. Which of the following is not a tillage tool?
     a. Weeder
     b. Cultivator
     c. Trowel
     d. Secateurs

7. Hormone that increase intermodal length:
     a. Auxin
     b. Gibberillin
     c. Kinetin
     d. Ethylene

8. The optimum humidity is maintained in
     a. Net frames
     b. Glass houses
     c. Green houses
     d. Mist chambers

III. Fill in the blanks/MCQ:

9. The reappearance of a remote ancestral character in the progeny is called _________
10. Points of contact between two non-sister chromatids are called __________
11. Girdling is:
     a. Removal of cambium
     b. Removal of Phloem
     c. Removal of strip of bark
     d. Removal of bud

12. A composite is resulted from:
     a. Grafting
     b. Budding
     c. Layering
     d. None of those

IV. State whether True or False:

13. There is not crossing over between members of a multiple allelic series.
14. Descendants of genetically pure and self-fertilizing individuals are called clones
15. A cross between F1 hybrids with one of the parents is called a single cross.
16. Callus is developed from the cambium of scion.

Part B (Short Answer Questions)
Write short answers on any five of the following
Each question carries a weight of 1. (5 x 1 = 5)

17. What is an allele?
18. Differentiate between Dominance and Epistasis.
19. What is meant by criss-cross inheritance?
20. What are cytogenes?
21. Expand NBPGR.
22. What are holandric genes?
23. What is a pureline?
24. Name any two ornamental gardens of national importance in South India.

Part C (Short Essay/Problem Solving Type)
Write Short Essays of the following, Answer any four questions
Each question carries a weight of 2 (4 X 2 = 8)

25. What are complementary genes? Explain with an example.
26. Give a brief account of polygenic inheritance.
27. Explain genic balance theory.
28. Differentiate between Hedges and Edges.
29. What are the objectives of plant breeding?
30. Write a short note on heterosis breeding.

Part D (Essay type)
Write essays of the following, Answer any two questions
Each question carries a weight of 4 (2 X 4 = 8)

31. Explain extra nuclear inheritance with suitable example.
32. Give a detailed account of landscape gardening.
33. Describe the methods of hybridization for self-pollinated crops.

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