Download SGBAU BSc 2019 Summer 2nd Sem Seed Technology Plant Breeding Methods For Crop Improvement n Seed Production Question Paper

Time: Three Hours] [Maximum Marks : 80

Note :

1. There are seven questions in all.

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2. Question No. 1 is compulsory and carries 8 marks.
3. Question Nos. 2 to 7 carry equal marks.
4. Draw well labelled diagrams wherever necessary.

1. (A) Fill in the blanks :
   1. When two alleles for a trait received from the parents are different the organism is said to be ________ for this trait. ½
   2. Headquarter of NBPGR is ________. ½

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   3. ________ selection has been commonly used breeding scheme applied to genetically variable and homozygous population of self pollinated crops. ½
   4. Extra chromosomes are present or missing in the cell; such condition is known as ________. ½
   (B) Choose the correct alternative (MCQ) :
   1. Individuals which contain two different chromosomes in triplicate instead of two times 2N+ 1+ 1)are called as ________. ½
      1. Double trisomics
      2. Double tetrasomic
      3. Double pentasomic

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      4. Diploids
   2. ________ originates spontaneously at a low frequency. ½
      1. Diploid
      2. Aneuploid
      3. Both

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      4. None
   3. When endospore development is ________, the condition is generally known as endosperm abortion. ½
      1. Maximum
      2. Neutral
      3. Poor

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      4. None
   4. Relative humidity affects seed ________ content because seeds are hygroscopic. ½
      1. Heat
      2. Air
      3. Soil

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      4. Moisture

9. Which factors reduce the quality of the seed ? 1
10. Define epistasis. 1

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11. Which rice is a gamma ray induced semidwarf mutant variety resistance to lodging ? 1
12. The ratio of dihybrid cross is ? 1

2. Comment on :
   1. Gene interaction. 4
   2. Acclimatization. 4
   3. Law of segregation. 4

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   OR
   1. Quarantine. 4
   2. Plant introduction agencies in India. 4
   3. Law of independent assortment. 4
3. Give detail account of artificial mutations and physical and chemical mutation. 12

   OR

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   Comment on :
   1. Mass selection. 6
   2. Hybridization procedure in cross pollinated crops. 6
4. Comment on :
   1. Classification of Polyploidy 4
   2. Causes of disease resistance 4

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   3. Allopolyploidy. 4
   OR
   1. Application of breeding for disease resistance. 4
   2. Anther culture. 4
   3. Effects of aneuploids. 4

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5. Comment on :
   1. Pollen viability. 4
   2. Genetic male sterility. 4
   3. Difference between seed and grain. 4
   OR
   1. Genetic purity of varieties. 4
   2. Factors affecting seed set. 4

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   3. Uses of self incompatibility. 4
6. Comment on :
   1. Pollination for hybrid seed production. 6
   2. Seed village concept. 6
   OR

   Give detail account of factors affecting the choice of area of seed production (any three). 12

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7. Comment on :
   1. Selection of land for seed production. 4
   2. Harvesting and threshing of seeds. 4
   3. Seed plot technique of potato multiplication. 4
   OR
   1. Indian seed industries. 4

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   2. Special agronomic management. 4
   3. Roughing in wheat. 4