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Question

Select the correct option:
i. Some essential elements can activate or inhibit enzymes.
ii. Some essential elements can change osmotic potential of a cell.
iii. All essential elements are components of energy related compounds.

A
Only ii is incorrect
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B
Both i & iii are correct
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C
Only iii is incorrect
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D
All statements are correct
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Solution

The correct option is C Only iii is incorrect
Essential elements in plants are divided into 4 broad categories:

i. Some essential elements are structural components of cells. Example- carbon, hydrogen, oxygen & nitrogen.
ii. Some essential elements are components of energy related compounds. Example- Magnesium, phosphorus.
iii. Some essential elements can activate or inhibit enzymes. Example- Zinc, molybdenum.
iv. Some essential elements can change osmotic potential of a cell. Example- Potassium.

Since all the essential elements are not components of energy related compounds statment iii is incorrect.

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