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Biology | CBSE Board | Grade 12 | 2017
Q. Explain the various steps involved in the production of artificial insulin.
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Q. Name the type of immunity the colostrum provides to a newborn baby.
Write giving an example where this type of immunity should be provided to a person.
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Q. State two postulates of Orparin and Haldane with reference to origin of life.
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Q. List the two methodologies which were involved in human genome project. Mention how they were used.
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Q. How did plant techniques help north Indian farmers to develop cane with desired characters?
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Q. Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.
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Q. Write the use of restriction endonuclease in the above process.
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Q. Explain 'addiction' and 'dependence' in respect of drug/alcohol abuse in youth.
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Q. Pollen grains in wheat are shed at "3-celled stage while in peas they are shed at 2-celled stage." Explain. Where are germ pores in a pollen grain?
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Q. Explain the process of pollination in Vallisneria. How is it different in water-lily, which is also an aquatic plant?
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Q. Suggest two practices giving one example of each, that help protect rare or threatened species.
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Q. Name the specific type of gene that is incorporated in a cotton plant against cotton boll worm infestation.
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Q. Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
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Q. Different animals responds to changes in their surroundings in different ways. Taking one example each, explain "some animals undergo aestivation while some others hibernation". How do fungi respond to adverse climatic conditions?
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Q. Differentiate between the genetic codes :
Degenerate and Initiator
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Q. What is disturbance in Hardy-Weinberg genetic equilibrium indicative of? Explain how it is caused.
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Q. Write the binomials of two fungi and mention the products/bioactive molecules they help to produce.
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Q. Why their is a fear amongst the guardians that their adolescent wards may bet trapped in drug/alcohol abuse?
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Q. Secondary treatment of the sewage is called biological treatment. Justify the statement and explain the process.
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Q. List four benefits to human life by eliminating the use of CFCs.
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Q. Name a human disease, its casual organism, symptoms (any three) and vector, spread by intake of water and food contaminated by human faecal matter.
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Q. Describe the inter relationship between productivity, gross primary productivity and net productivity.
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Q. By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and reproduction?
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Q. Write the desirable characters a farmer looks for in his sugarcane crop.
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Q. Explain the significance of 'palindromic nucleotide sequence' in the formation of recombinant DNA.
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Q. Differentiate between the genetic codes:
Unambiguous and Universal
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Q. An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands. Write the ecological implication because of it.
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Q. Expand 'YAC' and mention what was it used for.
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Q. Both Haemophilia and Thalassemia are blood related disorders in humans. Write their causes and the difference between the two. Name the category of genetic disorder they both come under.
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Q. A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem.
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