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Biology Test 16

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Biology Test 16
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Plants deficient in zinc, show reduced biosynthesis of growth hormone

    Solution

    Zinc is essential for the synthesis of tryptophan. Tryptophan is a precursor of auxin.

     

  • Question 2
    4 / -1

    Element present in middle lamella is

    Solution

    Element present in middle lamella is Ca in the form of calcium pectate. It provides mechanical support to the cell wall.

     

  • Question 3
    4 / -1

    Necrosis, or death of tissue particularly leaf tissue, is due to the deficiency of

    Solution

    Necrosis or death of tissue particularly leaf tissue occurs due to deficiency of Ca, Mg, Cu and K.

     

  • Question 4
    4 / -1

    Dark reaction of photosynthesis is known as

    Solution

    Dark reaction was first of all established by Blackman that’s why it is called Blackman’s reaction.

     

  • Question 5
    4 / -1

    Role of peroxisome in photorespiration is the

    Solution

    Photorespiration is a process of respiration which takes place in the presence of light and in chloroplasts only. In this process, first of all RuBP is oxygenated in presence of O2. Then, 1 molecule of a 2-C phosphoglycolate and 1 mol. Of a 3C PGA are formed from it. The PGA molecule is used in the Calvin cycle. Phosphoglycolate is dephosphorylated and glycolate is formed. Glycolate diffuses out of chloroplast and enters the organelle called peroxisome. Here it is oxidized and becomes glyoxylate. Glyoxylate is used in synthesis of glycine.

     

  • Question 6
    4 / -1

    How many molecules of glycine is required to release one CO2 molecule in photorespiration

    Solution

    There is two molecule of glycine used and interact to form one molecule each of serine CO2 and NH3. 
    2Glycine+H2O +NAD → Serine + CO2 + NH3 + NADP

     

  • Question 7
    4 / -1

    Which of the following represents the correct molecular formula of chlorophyll-b?

    Solution

    Chlorophyll b is a form of chlorophyll. Chlorophyll b helps in photosynthesis by absorbing light energy. Its color is yellow, and it primarily absorbs blue light. Its molecular formula is C55H70O6N4Mg.

     

  • Question 8
    4 / -1

    What is the by–product of bacterial photosynthesis?

    Solution

    In bacterial photosynthesis, H2S is the hydrogen donor so the ‘oxidation’ product is sulphur or sulphate depending on the organisms and not O2.

     

  • Question 9
    4 / -1

    Physiological demonstration of osmosis is

    Solution

    Thistle funnel whose mouth is tied with egg membrane is the physiological experiment of osmosis. Egg membrane is a semipermeable membrane which allows all solvents but no solute to pass through them.

     

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