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Plant Growth and Development question

2006 · Q5
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Plant Growth and Development question

2006 · Q5

NEETBiologyPlant Growth and DevelopmentMCQ+4 / −1
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?
  1. A
    Application of iron and magnesium to promote synthesis of chlorophyll
  2. B
    Frequent irrigation of the crop
  3. C
    Treatment of the plants with cytokinins along with a small does of nitrogenous fertilizer
  4. D
    Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophhenoxy acetic acid
View written solutionFree

Correct answer: C

Nitrogen is the fourth most abundant element. Chief source of nitrogen for plants is nitrates of Ca and K. It is important for plants as it is a component of nucleic acids, proteins, chlorophyll and cytochromes. Deficiency of nitrogen causes poor root development, lower respiration rate, chlorosis of older leaves, etc. Cytokinins are also very important for plant development. They are associated with the control of apical dominance, fruit development, root growth, cambial activity. So a nitrogenous fertilizer like NPK and cytokinins are most beneficial to the plant.

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