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
• B. Both i & iii are correct
• C. Only iii is incorrect
• D. All statements are correct

Answer 1

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.