Class 12th Biology 2013 Set2 Delhi Board Paper Solution 
    
    
        
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                Q1   Write the equation that helps in deriving the net primary produ... 
                Q2   Name the type of biodiversity represented by the following: 
                Q3   Why is the enzyme cellulase needed for isolating genetic materi... 
                Q4   Write the importance of MOET. 
                Q5   Identify the examples of homologous structures from the followi... 
                Q6   Name the enzyme and state its property that is responsible for ... 
                Q7   Why sharing of injection needles between two individuals is not... 
                Q8   An anther with malfunctioning tapetum often fails to produce vi... 
                Q9   Describe the gene therapy procedure for an ADA-deficient patien... 
                Q10   Expand the following and mention one application of each:  
                Q11   Name any two sources of e-Wastes and write two different ways f... 
                Q12   Why the pyramid of energy is always upright? Explain. 
                Q13   Explain why very small animals are rarely found in polar region. 
                Q14   (a) How does cleistogamy ensure autogamy?  
                Q15   When and where do chorionic villi appear in humans? State their... 
                Q16   In a cross between two tall pea plants some of the offsprings p... 
                Q17   A young boy when brought a pet ...
 
                Q18   (a) Explain how to find whether an E.coli bacterium has transfo... 
                Q19   (a) Why are the fruit juices bought from market clearer as comp... 
                Q20   (a) Why are transgenic animals so called?  
                Q21   How have human activities caused desertification? Explain.  
                Q22   (a) Explain how to overcome inbreeding depression in cattle. 
                Q23   Explain mutualism with the help of any two examples. How is it ... 
                Q25   (a) Why is human ABO blood group gene considered a good example... 
                Q26   With the help of any two suitable examples explain the effect o... 
                Q27   (a) Draw a diagram of the structure of a human ovum surround...
 
                Q28   Describe the asexual and sexual phases of life cycle of Plas...
 
                Q29   A child by the family from Thalassemia is born to a normal coup... 
                Q30   (a) Draw a labelled schematic diagram of the transverse sect...
 
                 
        
 
Question 18 
(a) Explain how to find whether an E.coli bacterium has transformed or not when a recombinant DNA bearing amplicillin resistant gene is transferred into it.  
 Answer
 
	(a) If E. Coli has been transformed then these ‘transformed E.coli’ cells would be able to grew on ampicillin medium.
	 
	(b) Ampicillin resistant gene acts as a selectable marker in this case.
  
 
            
        
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