Minerals and Nutrients

Magnesium deficiency results in extensive interveinal chlorosis of leaves. 

This is the correct option as silicon is found in negligible percentage of the weight of the human body.

Iron (Fe), molybdenum (Mo) and vanadium (Vd) are present in nitrogenase enzyme.

Carbon is the most abundant element in the human body by mass, making up approximately 18% of total body weight. This is because carbon is the fundamental building block of all organic molecules - proteins (16% of body mass), fats, carbohydrates, and nucleic acids all contain carbon atoms in their backbone structures. While oxygen is the most abundant by number of atoms (65%), carbon-containing molecules have higher atomic mass.

 This is the correct option. Iron is not present in plant tissues in excess of 10 m mole Kg^-1 of dry matter. It is a micronutrient. 

This is the correct option. Magnesium and phosphorus function as components of energy-related chemical compounds in plants.

This is the correct option. Nitrogen is the major constituent of proteins, vitamins, hormones and nucleic acids.

This is the correct option. Cobalt is not a beneficial element required by higher plants.

This is the correct option as nitrogen and phosphorus are absorbed from the soil as mineral nutrition.

This is the correct option as this is not a criteria of essentiality of an element for the growth of a plant. The element must be directly involved in the metabolism of the plant.

This is the correct option. Manganese activates enzymes that are involved in photosynthesis, respiration and nitrogen metabolism.

This is the correct option. Sulphur is present in cysteine and methionine. It is obtained by plants in the form of sulphate.

This is the correct option. Potassium plays an important role in the opening and closing of stomata.

This is the correct option as copper is essential for the overall metabolism in plants and is associated with certain enzymes involved in redox reactions.

This is the correct option.