Question

Toxicity of which micronutrient induces deficiency of iron, magnesium and calcium ?

• A. Boron
• B. Zinc
• C. Molybdenum
• D. Manganese

Answer 1

The Correct Option is D

Manganese toxicity can induce the deficiency of several essential nutrients like iron, magnesium, and calcium in plants.

• Manganese is a micronutrient that plays a key role in photosynthesis, specifically in the water-splitting complex of photosystem II.
• However, when present in excess, manganese toxicity can disrupt the uptake and functioning of other essential nutrients, particularly iron and magnesium, by interfering with their absorption and assimilation in the plant.
• This leads to chlorosis (yellowing of leaves due to iron deficiency) and deficiency symptoms related to magnesium and calcium, such as stunted growth and poor root development.

Other micronutrients like boron (A), zinc (B), and molybdenum (C) have different roles and do not typically induce deficiencies of iron, magnesium, and calcium when toxic.

Thus, the correct answer is (D) : Manganese.

Answer 2

The correct answer is: (D) Manganese.

Manganese is a micronutrient that, when present in excess, can lead to toxicity in plants. Interestingly, manganese toxicity can interfere with the uptake and assimilation of other essential nutrients, including iron, magnesium, and calcium. This is because high levels of manganese can disrupt the balance of nutrient uptake by competing with these elements for absorption in plant roots.

Excess manganese affects the transport systems in plant cells, preventing the efficient absorption of other micronutrients and macronutrients. This nutrient imbalance results in deficiencies of iron, magnesium, and calcium, which can severely affect plant growth and development.

Therefore, manganese toxicity is a significant issue in plants, especially in soils with high manganese levels, leading to nutrient deficiencies that impact overall plant health.