Crop Improvement Mid - I, September - 2014

1.The quickest method of plant breeding is
  • introduction
  • Selection
  • Hybridisation
  • Mutation Breeding
Answer: D
2.Breeding for disease resistance requires
  • a good source of resistance
  • Planned hybridization
  • Diseases test
  • all of these
Answer: D
3.Any biological quality in a hybrid offspring is increased by
  • Hybrid vigour
  • Mutation
  • Selection
  • Pedigree breeding
Answer: A
4.The most common solidifying agent used in micropropagation is
  • agar
  • dextran
  • Mannan
  • all of these
Answer: A
5.Somaclonal variations are the ones
  • Caused by mutagens
  • Produce during tissue culture
  • Caused by gamma rays
  • Induced during sexual embryogeny
Answer: B
6.Somatic embryogenensis is used for
  • plant transformations
  • mass propagation
  • both a and b
  • none
Answer: C
7.Cytoplasmic male sterility is importanat in
  • growth of plant shoot
  • hybrid maize production
  • golden rice
  • low yield of crop
Answer: B
8.Genetic manipulation of photosynthesis in the plant leads to
  • less yield of crop
  • increasing nutrients in crop
  • increasing crop productivity
  • resistance to diseases
Answer: C
9.Which vector is mostly used in crop improvement?
  • Plasmid
  • Cosmid
  • Phasmid
  • Agrobacterium
Answer: D
10.Role of fungi in crop improvement
  • Returns the dead material into the soil
  • nitrogen fixation
  • protein supplement
  • disease resistance
Answer: A
11.The breeding of plants for particular traits by humans is called ________________
Answer: Selective breeding
12.______________ may be defined as a description of the ancestors of an individual and it generally goes back to some distant ancestors
Answer: Pedigree
13.Nutrients required by plants in large quantities are called _________________
Answer: Macronutrients
14.A technique of micro propagation in plants is used in ________________
Answer: Somatic embryogenesis
15.Cytological hybrids are also called _______________
Answer: Cybrids
16.The variations in invitro culture are called ___________________
Answer: Somaclonal variations
17.The conversion of nitrogen to ammonia or nitrogenous compounds is called as_______________
Answer: Nitrogen fixation
18.________________ creates Anaerobic condition for optimum activity of nitrogenase
Answer: leghaemoglobin
19.Transgenic plants in dicotyledons have been produced for crop improvement, to become _______________ resistant
Answer: Disease
20.The basic advantages of inter-cropping are that it maintains soil____________ and control_____________
Answer: Fertility,Weeds