SSC General Science & Technology Sample Paper NCERT Sample Paper-7

  • question_answer
    Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

    A)  Frequent irrigation of the crop

    B)  Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer

    C)  Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid

    D)  Application of iron and magnesium to promote synthesis of chlorophyll

    Correct Answer: D

    Solution :

    [d] MAGNESIUM is a key element of chlorophyll production that improves utilization and mobility of phosphorus. Activator and component of many plant enzymes. Directly related to grass tetany. Increases iron utilization in plants. Influences earliness and uniformity of maturity IRON Promotes formation of chlorophyll -Acts as an oxygen carrier - Reactions involving cell division and growth

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