CBSE Class 12 Biology Question Paper 2009 Set 57 2 1

CBSE CLASS XII Questions

• 1.

  In Pisum sativum, the flower colour may be violet (V) or white (v). What proportion of the offspring in a cross of "VV × vv" would be expected to be violet?

  • 25%
    
  • 50%
    
  • 75%
    
  • 100%
    
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• 2.

  Choose a correct option that shows an interaction in which one species benefits while the other is neither harmed nor benefitted.

  • Mycorrhizal associations between fungi and roots of higher plants
    
  • Sea anemone and clownfish
    
  • Abingdon tortoises and goats in the Galapagos Island
    
  • Cuscuta on hedge plants
    
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• 3.

  "Indo-Burma" is considered as a hotspot. What is meant by the term "hotspots" in biodiversity ? List two criteria used for determining a "hotspot". Name any two hotspots of India.

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• 4.

  (i) Differentiate between a DNA and RNA nucleotide.

  (ii) Name the two types of bonds present within a single nucleotide.

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• 5.

  Which of the following is a secondary consumer ?

  • Grasshopper
  • Cow
  • Fish
  • Hawk
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• 6.

  Monascus purpureus is a yeast used commercially in the production of which one of the following?

  • Ethanol
    
  • Streptokinase
    
  • Citric acid
    
  • Statins
    
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