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Question

Among these groups, one element is involved in opening and closing of stomata, the other helps to maintain ribosome structure. Choose the correct option.

A
K and Ca
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B
P and S
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C
K and Mg
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D
Fe and Mg
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Solution

The correct option is C K and Mg
Potassium (K) and Magnesium (Mg) are essential macronutrients for plants.
K is absorbed as K+. In plants, it is required in more abundant quantities in the meristematic tissues, buds, leaves and root tips. It helps to maintain an anion-cation balance in cells. It is involved in opening and closing of stomata.
Mg is absorbed by plants in the form of divalent magnesium ion (Mg2+). It is required in the growing area of roots and stem, seeds, leaves, etc. It occurs as magnesium pectate in middle lamella. It is responsible for maintenance of ribosome structure because it is required for the binding of ribosome subunits during protein synthesis

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