The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

  • Manganese and Chlorine

  • Manganese and Potassium

  • Magnesium and Molybdenum

  • Magnesium and Chlorine

Chromatophores take part in

  • Photosynthesis

  • Growth

  • Movement 

  • Respiration

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rate of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

  • C4

  • CAM

  • Nitogen-fixer

  • C3

Cyclic-photophosphorylation results in the formation of 


  • ATP and NADPH

  • ATP, NADPH and O2

  • ATP

In photosystem-I, the first electron acceptor is

  • Ferredoxin

  • Cytochrome

  • Plastocyanin

  • An iron sulphur protein

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