Minerals and Nutrients

Iodine is required for proper working of thyroid. Rich sources of iodine are vegetables, mineral water and iodised salt.

Molybdenum is a component of nitrate reductase, which participates in nitrogen metabolism.

Chara is used to overcome calcium deficiency in the fields. Thus, a rice field deficit in calcium would most probably be helped by addition of chara.

Calcium is a key component in both bone and cement. In bones, calcium phosphate (hydroxyapatite) provides structural strength and rigidity. In cement, calcium compounds like calcium silicate hydrate form during the curing process, binding the material together. The other elements listed are not major components of both materials.

this option is correct because magnesium is present in chlorophyll and helps in capturing he energy from the sunlight for making food for plants.

this option is correct because K⁺ ion is having a great biological significance as it remains present within the cell fluid and supports the sodium pump or sodium potassium pump

PS II

Palak (spinach) leaves are rich in iron, which is why they're often recommended for combating anemia. While spinach also contains other minerals like magnesium and manganese, its high iron content is what makes it nutritionally significant. Phosphorus is found in more diverse foods like dairy and nuts.

This answer is right.

  Iron  

Plasocyanin is an example of copper containing metalloprotein.

Ceruloplasmin, a glycoprotein produced in the liver, carries or transports more than 95 percent of the copper in blood plasma.

Micronutrients are nutrients required by humans and other organisms throughout life in small quantities to orchestrate a range of physiological functions. Examples: Mn, Co, Ni, Cu, Zn, V, Cr, Mo, Se, F, I, Al, Pb, Sn, Si

Pernicious anemia is one of the obvious symptoms of a cobalt deficiency.

The molecular structure of chlorophyll consists of a N-ring with a Mg center, side chains, and a hydrocarbon tail.