Q. Farmers in a particular region were concerned that premature 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) Application of iron and magnesium to promote synthesis of chlorophyll.
(b) Frequent irrigation of the crop.
(c) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer.
(d) Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5 – T.
Solution :
Correct option : C Treatment of plants with cytokinin plant hormone can result in the delaying of ageing of plants. Actually the plant is facing troubles which are related to senescence. Cytokinin will retard the destruction of chlorophyll, proteins, etc.