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?
- Frequent irrigation of the crop
- Treatment of the paints with cytokinin's along with a small dose of nitrogenous fertilizer
- Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5- trichlorophenoxy acetic acid
- Application of iron and magnesium to promote synthesis of chlorophyll
The Correct Option is D
Solution and Explanation
Premature yellowing of leaves is often associated with chlorophyll deficiency, which can be caused by a lack of essential nutrients like iron and magnesium. Chlorophyll is crucial for photosynthesis, and its synthesis depends on the availability of these nutrients. By applying iron and magnesium, you can potentially address the underlying issue of chlorophyll deficiency and promote healthy green leaves capable of photosynthesis, ultimately contributing to better seed yield. While the other options may have some benefits, addressing the nutrient deficiency is a more direct approach to combat leaf yellowing and improve overall plant health and seed yield.
So, the correct option is (D): Application of iron and magnesium to promote synthesis of chlorophyll
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Concepts Used:
Plant Growth and Development
Growth in Plants:
Plants have the distinctive ability to grow throughout their life. The meristem cells present there in the roots and shoot apical lead to the primary growth of the plant. The primary growth which happens or takes place at the tips of the stem and roots of the plant contributes to the elongation of the plant along its axis.
In the later stages of growth in plants, the growth in dicotyledonous, vascular cambium, gymnosperms, and cork-cambium are also caused by the existence of meristems in them. These intercalary meristems are put up to increase the girth of the organs of the plant in which they are active. Such type of growth is commonly known as secondary growth.
Many parameters such as area, volume, fresh weight, cell number, dry weight, length, etc are utilized to measure the growth in plants as increase in the amount of protoplasm is responsible for the growth in plants.
Read More: Plant Growth and Development