Download PTU B.Sc-Agriculture 2020 March 5th Sem 74171 Introduction Of Plant Breeding Question Paper

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) B.Sc-Agriculture 2020 March Previous Question Papers

1 | M-74171 (S2)-1371
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Sc.(Agriculture) (2014 to 2018) (Sem.?5)
INTRODUCTION OF PLANT BREEDING
Subject Code : BSAG-507
M.Code : 74171
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
Q1. Write short notes on :
a. Megagametogenesis
b. Adventive embryony
c. Hybrid vigour
d. Genetic load
e. Over dominance
f. Top cross
g. Clonal selection
h. Directed mutagenesis
i. MAALs
j. Bridging species
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1 | M-74171 (S2)-1371
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Sc.(Agriculture) (2014 to 2018) (Sem.?5)
INTRODUCTION OF PLANT BREEDING
Subject Code : BSAG-507
M.Code : 74171
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
Q1. Write short notes on :
a. Megagametogenesis
b. Adventive embryony
c. Hybrid vigour
d. Genetic load
e. Over dominance
f. Top cross
g. Clonal selection
h. Directed mutagenesis
i. MAALs
j. Bridging species

2 | M-74171 (S2)-1371
SECTION-B
Q2. Discuss various applications and limitations of distant hybridization in crop improvement.
Q3. What is polyploidy breeding? Define heteroploidy and list various types of changes in
chromosome number.
Q4. Define Mutations. Briefly describe the characteristics of mutations and their effect on
survival of organisms.
Q5. What is a clone? What are the main characteristics of clones? Compare clones, Inbreds and
pure lines.
Q6. What is recurrent selection? List the various types of recurrent selection. Which scheme do
you prefer and why?

SECTION-C
Q7. Explain the dominance and over dominance hypotheses of heterosis giving their main
features, objections and answers to the objections. Which of the above two hypotheses is
more widely accepted and why?
Q8. What is back cross method of breeding? Explain the transfer of recessive gene (disease
resistance) in to a cultivated variety of wheat which is susceptible to that particular disease.
Q9. Define Autopolyploidy. Briefly describe the methods of production of autopolyploids and
their importance and limitations in crop improvement.





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