CBSE  /  Class 11  /  Biology  /  Mineral Nutrition

  • 1. 
    In plants, a common symptom caused by deficiency of P, K, Ca and Mg is the

  • bending of leaf tip
  • formation of anthocyanins
  • poor development of vasculature
  • appearance of dead necrotic tissue

  • 2. 
    Function of zinc is

  • Closing of stomata
  • Biosynthesis of 3-IAA
  • Synthesis of chlorophyll
  • Oxidation of carbohydrate

  • 3. 
    Which of the following is a group of micronutrients?

  • Ca, Zn, B
  • Fe, Mn, Cu
  • Cl, C, Ca
  • Ni, Mo, H

  • 4. 
    The process of conversion of NO

  • nitrification
  • ammonification
  • denitrification
  • nitrogen fixation

  • 5. 
    The formation of first stable product of nitrogen fixation is catalysed by enzyme

  • dehydrogenase
  • nitrogenase
  • isomerase
  • none of these

  • 6. 
    Manganese toxicity leads to deficiency of

  • iron
  • calcium
  • magnesium
  • all of the above

  • 7. 
    Chlorosis will occur if a plant is grown in

  • dark
  • shade
  • strong light
  • Fe – free medium

  • 8. 
    Choose the correct function of magnesium.

  • It is a constituent of several coenzyme.
  • It activates the enzymes of respiration and photosynthesis.
  • It activates enzyme catalase.
  • It helps in maintaining anion-cation balance.

  • 9. 
    Mineral salts which are absorbed by the roots from soil are in the form of

  • Dilute solution
  • Very concentrated solution
  • Concentrated solution
  • Very dilute solution

  • 10. 
    Which one of the following mineral elements plays an in biological nitrogen fixation?

  • Copper
  • Manganese
  • Zinc
  • Molybdenum
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