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    Photosynthesis in Higher Plants
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    What are carotenoids ?
    Carotenoids are accessory pigments that also absorb light and transfer the energy to chlorophyll a. These are  hydrocarbons with a general formula C40H56. They are abundant in carrots, tomatoes, apricots and mangoes. They are of yellow or orange colour. 
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    What is DCMU ?
    It is herbicide. Its expanded form is Dichlorophenyl dimethyl urea. It inhibits the electron tranport chain. 
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    Name the minerals required in synthesis of chlorophyll.
    Iron and magnesium are required in the synthesis of chlorophyll. Magnesium is the direct component of chlorophyll molecule.
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    What is photoluminescence ?

    Photoluminescence is the phenomenon of emission of absorbed energy in the form of light. Photoluminescence is of two types i.e. fluorescence and phosphorescence.
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    What are Xanthophylls ?
    Xanthophylls or carotenols are oxygen derivatives of carotenes with molecular formula C40H56O2 e.g. lutein, zeaxanthin. These are also accesory pigments which absorb light and transfer the energy to chlorophyll.
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