Minerals and Nutrients

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.

Sn (Tin) is present in budotitane used to treat cancer. So, this option is correct.

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

Formaldehyde ferredoxin oxidoreductase is a tungsten containing metalloenzyme.

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

Land plants obtain carbon directly from the atmosphere in the form of carbon dioxide (CO2) during photosynthesis. Other elements like nitrogen and phosphorus are primarily absorbed from the soil.

Ferredoxins are iron-sulfur proteins that act as electron carriers in various metabolic processes, most notably in the light reactions of photosynthesis. The name is derived from 'ferrum', the Latin word for iron.

The middle lamella is the outermost layer of the plant cell wall that glues adjacent cells together. It is primarily composed of calcium and magnesium pectates.

Micronutrients are essential elements required by plants in very small quantities. Zinc (Zn) is a micronutrient, while Magnesium (Mg), Phosphorus (P), and Potassium (K) are macronutrients required in larger amounts.