Which ion represents the soil uptake form for Molybdenum (Mo)?

The correct choice is the Molybdate ion, which represents the primary form in which molybdenum is absorbed by plants from the soil. Molybdenum is crucial for various physiological processes, including nitrogen fixation and the conversion of inorganic phosphate to organic forms, which are essential for plant growth and health.

In the soil, molybdenum typically exists as molybdate (MoO4^2-), an anion that is readily taken up by plant roots. This uptake occurs primarily under neutral to alkaline conditions, where molybdate is more soluble and available for absorption. The presence of the molybdate ion in the soil facilitates the plant’s ability to access this trace element, which is necessary in small amounts for enzyme function and overall plant metabolism.

The other ions listed do not represent the uptake form for molybdenum. Manganous ion refers to manganese, which is a different micronutrient essential for plant growth but not related to molybdenum. The nitric ion pertains to nitrogen availability and uptake, specifically as nitrate (NO3-), and calcium ion is related to plant cell structure and nutrient regulation, but neither is involved in molybdenum uptake. Thus, understanding the correct form of uptake