Biology – Important Question Bank for Rajasthan class 12th (XII) (HSC) Board Exam 2017 

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After the tremendous success of our last year Important Question Bank for Rajasthan class 12 (HSC) Board Exam 2016, we have also created a list of  Most Important Question Bank for Rajasthan class 12th (XII) (HSC) Board Exam 2017 which are likely to appear in HSC Board Exams this year.

class 12th std rajasthan board

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  1. What is ecological succession? Mention its different steps. Explain Hydrarch and Xerarch succession with diagrammatic representation.
  2. What are ecological pyramids? What precautions should be kept in mind in calculating its different aspects? Draw the diagrams of pyramids of grassland ecosystem and energy flow ecosystem
  3. Explain in detail the role of restriction endonculease in formation of recombinant DNA. Draw a labeled diagram of E.Coli cloning vector pBR 322.
  4. What is nucleosome? Explain the packaging of DNA helix. Draw the labeled diagram of nuclesosme.
  5. What is transcription? Explain the process of transcription in bacteria by labeled diagram
  6. Write down the adaptations found in organism to face the extremes conditions of environment factors. (any three)
  7. Describe the dihybrid cross experiment performed by Mendel. Explain the law postulated by this experiment
  8. Describe the responses found in organisms against the environmental abiotic factors (any three)
  9. Write down the names of post fertilization events in flowering plants. Describe the process of embryo development
  10. What is bio-diversity? Mention the causes of loss of biodiversity (any three)
  11. What is air pollution? Describe the efforts made for controlling vehicular air pollutions
  12. Define Genetically Modified Organism. How GM plants are useful for us?
  13. What is pollution? Describe the study and efforts made for the remedy of plastic waste.
  14. Write down the application of biofertilizers. Explain the role of cyanobacteria as a biofertilizer.
  15. Write down the objectives of plant breeding. Mention the main steps in breeding any new genetic crop.
  16. What is innate immunity? How many types of barriers are present in innate immunity write down their names?
  17. Prove the organic evolution on the basis of comparative anatomy and morphology
  18. Write down the four salient features of genetic code
  19. What is co-dominance? With the help of example explain co-dominance in human- being
  20. How bisexual and unisexual conditions in fungi and plants are denoted?

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