GPB 503 PRINCIPLES OF PLANT BREEDING Question Paper

GPB 503 (2+1): PRINCIPLES OF PLANT BREEDING SEMESTER I 2015-16
Marks: 12.5

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Q.1. Write short notes on the following (Any five - 1.0 marks each)

5.0 M

a) Ideotype
b) Heritability
c) Combination breeding
d) Homeostasis
e) Transgressive breeding
f) Gene pool concept
g) Dwarfing genes and their manifestations
h) G × E interaction

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Q.2. Differentiate the following: (1.0 marks each)

5.0 M

a) Competition and Communal ideotype
b) Genetic engineering and conventional breeding
c) Plant random and non-random mating
d) Specific and general adapted genotypes
e) Primary and secondary introduction

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Q.3. Fill in the blanks in the following: (0.25 each)

2.5 M

a) Backcross breeding is the most effective breeding method only when the trait is governed by __________.
b) PWR is headed by __________.
c) While land races exhibit wide local adaptability, pureline varieties exhibit __________ adaptability.
d) Self-pollinated crop species exhibit __________ advantage.
e) Selection acts only on __________ variability and it cannot create variation.
f) Narrow sense h² heritability exploits the additive component variability.
g) Wild type species are treasure houses of resistance to disease and pests and tolerance to heat and drought.
h) Cross-fertilizing heterozygous populations carry a great deal of balanced __________.

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