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(A-B) The toxicity of any mineral ion is defined as the concentration of the mineral ion in tissues that reduces the dry weight of tissues by about $1

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Lead toxicity

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(A-B) The toxicity of any mineral ion is defined as the concentration of the mineral ion in tissues that reduces the dry weight of tissues by about $10\%$. Two examples of toxic elements are: $1$. Manganese $(Mn)$: Its toxicity leads to the appearance of brown spots surrounded by chlorotic veins. It competes with iron $(Fe)$ and magnesium $(Mg)$ for uptake and also inhibits calcium $(Ca)$ translocation to the shoot apex. $2$. Aluminum $(Al)$: Its toxicity primarily affects root growth by inhibiting cell division in the root tips,leading to a stunted root system and reduced nutrient uptake.

Write the effect of any two toxic elements on plants.

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