Question

Regarding mineral nutrition in plants, which one of the following statements is/are incorrect?
(a) Deficiency of boron inhibits pollen germination
(b) Deficiency of potassium affects the opening and closing of stomata
(c) $Z{n}^2$${}^{+}$ is an activator of RuBisCO.
(d) Deficiency of nitrogen leads to delay in flowering

• A. a, d
• B. b, c
• C. a, b, c, d
• D. only c

Answer 1

The correct option is D only c

Boron is required for membrane functioning, pollen germination, cell elongation and cell differentiation. Hence deficiency of boron inhibits pollen germination.

Potassium is a macronutrient that helps to maintain an anion-cation balance in cells and is involved in protein synthesis, opening and closing of stomata, activation of enzymes and also in the maintenance of the turgidity of cells. Hence, its deficiency affects the opening and closing of stomata.

Zinc activates various enzymes such as carboxylases, carboxypeptidases and alcohol dehydrogenases.

Mg${}^2$${}^{+}$ is an activator for ribulose bisphosphate carboxylase oxygenase (RuBisCO).

Deficiency of nitrogen, sulphur and molybdenum leads to delay in flowering.