Minerals and Nutrients

In acidic soils (low pH), aluminium becomes soluble and toxic to plant roots, inhibiting root growth and nutrient uptake. This is a major problem in agriculture on acidic tropical soils. Other options like carbon, zinc, and iron are either not typically toxic in these conditions or essential micronutrients. Aluminium toxicity is a well-documented issue in soil science.

Calcium phosphate (specifically hydroxyapatite) is the primary mineral component of bones and teeth, providing hardness and structural strength. Calcium carbonate is found in seashells and eggshells, while calcium sulphate and nitrate are not major components of skeletal tissue.

Hemoglobin contains iron in the form of heme groups, which bind oxygen molecules for transport throughout the body. Each hemoglobin molecule contains four iron atoms. This is why iron deficiency leads to anemia - not enough iron to make functional hemoglobin.

Bones and teeth are primarily composed of calcium phosphate in the form of hydroxyapatite. This mineral compound provides structural rigidity, unlike calcium carbonate (shells), calcium sulfate, or calcium nitrate.

Hemoglobin's key component is iron, which enables it to bind and transport oxygen. Each hemoglobin molecule contains four iron atoms that give blood its red color and allow efficient oxygen delivery throughout the body.

Chlorophyll is a chelate compound where magnesium is the central metal ion, coordinated to a porphyrin ring. This is similar to heme in blood where iron is the central metal. Copper, iron, and calcium are not the central metal in chlorophyll.

Chlorophyll's porphyrin ring contains a magnesium ion (Mg2+) at its center, which is essential for photosynthesis. Iron is the central metal in heme (hemoglobin), while copper and calcium are not involved in chlorophyll structure.

It is a micronutrient & an enzyme cofactor. It is also required for photosynthesis in plants.

Lead is not an essential mineral element for plants. 

Nickel is a micronutrient. Plants need micronutrients in concentrations of less than 100 milligrams per kilogram of their dry matter.

In plant nutrition, elements required in small amounts (less than 10 mg/kg dry matter) are classified as micronutrients. Copper (Cu) and Molybdenum (Mo) are essential micronutrients needed for enzyme function and nitrogen metabolism respectively. Magnesium (Mg) and Sulphur (S) are macronutrients required in larger quantities - Mg is central to chlorophyll, and S is crucial for protein synthesis.

Sodium is required for the proper functioning of the nervous system. Hence, it is the correct answer.

Calcium and phosphorous should be included in a balance diet to develop strong bones because these two minerals work together to keep bones strong.

This is a macro nutrient.

It forms 67% of bone mass.