A shortage of ___________ triggers yellowing in plants?
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Answer: A. Magnesium
Explanation
Magnesium is a vital central atom within every chlorophyll molecule required for capturing light energy. A shortage of magnesium prevents chlorophyll synthesis leading directly to interveinal yellowing across plant leaves. Without adequate magnesium plants cannot maintain their green coloration or perform efficient photosynthetic reactions. Chlorophyll is the primary green pigment responsible for absorbing light during plant photosynthesis. Magnesium acts as an essential macronutrient that activates numerous key enzymatic reactions in plants. Mobile nutrients like magnesium are translocated from older leaves to younger growing tissues during deficiency.
Agricultural specialists test soil nutrient levels regularly to prevent magnesium deficiency in commercial crop fields. Gardeners apply magnesium-rich fertilizers such as epsom salts to revive yellowing tomato and pepper plants. Crop productivity declines sharply when nutrient shortages impair photosynthetic capacity during the growing season. Iron deficiency also causes yellowing but typically appears first as chlorosis in young developing leaves. Chlorine is a micronutrient involved in osmosis and oxygen evolution rather than chlorophyll ring formation. Oxygen is freely available from air and water and is not typically a mineral shortage issue.
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