A lower concentration of a mineral element ca | vedclass

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(D) In plant physiology, the concentration of essential mineral elements is critical for growth.$1$. When the concentration of a mineral element falls

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Deficiency symptoms,Toxicity

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(D) In plant physiology, the concentration of essential mineral elements is critical for growth.$1$. When the concentration of a mineral element falls below a certain level, it is termed as the critical concentration, and the plant shows specific morphological changes known as $	ext{Deficiency symptoms}$.$2$. When the concentration of a mineral element exceeds a certain level, it interferes with the uptake or metabolism of other nutrients, leading to $	ext{Toxicity}$.

Column $I$ (Disorder)	Column $II$ (Description)
$i$. Chlorosis	$a$. Localised death of tissues in leaves
$ii$. Necrosis	$b$. Premature fall of flowers,fruits and leaves
$iii$. Mottling	$c$. Yellowing of leaves due to absence of chlorophyll
$iv$. Abscission	$d$. Appearance of green and non-green patches on leaves

$A$ lower concentration of a mineral element causes $...........$ and a higher concentration causes $.............$.

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