Question

Select out the correct match regarding functional categories of essential elements.

• A. Structural elements $\to$ Mg, K, Fe
• B. Energy related elements $\to$ C, H, O, N
• C. Enzyme activation elements $\to$ Mo, Mg
• D. Osmotic regulation related element $\to$ Mg, P

Answer 1

The correct option is C Enzyme activation elements $\to$ Mo, Mg

1. Structural elements - Mg, K, Fe is incorrect match as carbon, hydrogen, oxygen and nitrogen are structural elements of cells.
2. Energy related elements - C,H,O,N is incorrect match as components of energy-related chemical compounds in plants are magnesium in chlorophyll and phosphorous in ATP.
3. Enzyme activation elements - Mo, Mg is correct match as Mo is an activator of nitrogenase during nitrogen metabolism and $M{g}^{2+}$ is an activator for both ribulose bisphosphate carboxylase oxygenase and phosphoenol pyruvate carboxylase in photosynthetic carbon fixation.
4. Osmotic regulation related element - Mg, P is incorrect match as osmotic regulation related element is K because K is important in the opening and closing of stomata.