Minerals and Nutrients

Phosphorus, present in an organic compound, is estimated by Carius method as magnesium pyrophosphate.

This is the correct option. Deficiency of fluorine causes dental decay. Fluoride taken in correct amount helps prevent tooth decay by making the tooth more resistant to acid attacks from plaque bacteria and sugars in the mouth. It also reverses early decay.

Alkaloids are a group of naturally occurring chemical compounds that contain mostly basic nitrogen atoms. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals, and is the main nitrogen-containing substance in the urine of mammals.

Zinc is required for auxin synthesis.

Macronutrients like nitrogen, phosphorus, and potassium are required by plants in large quantities for growth and development. Micronutrients like iron and zinc are needed in smaller amounts, while "essential" and "prepared" aren't quantity-based categories.

Calcium is a component of endospores and provides heat resistance to them.

 Mn, Co, Ca these three elements affect both photosynthetic and mitochondrial electron transport.They are activally involved in both the processes.

This is the correct option. Manganese is not a macronutrient. It is a micronutrient.

Minerals are inorganic nutrients that come from the soil and water, unlike organic nutrients like carbohydrates, proteins, and vitamins which contain carbon-hydrogen bonds. Common minerals include calcium, iron, potassium, and sodium. The body cannot synthesize minerals and must obtain them from food.

Red soil derives its characteristic color from iron oxide compounds, particularly hematite and goethite, which form through weathering in warm, temperate climates. While calcium (A), magnesium (B), and copper (D) may be present in various soils, they don't produce the distinctive red coloring that iron oxides do.

Boron, manganese, and molybdenum are well-established essential micronutrients for plants. Nickel's status is debated in older curricula but is now considered essential for urease function in many plants. However, traditional exam resources often list only Fe, Mn, Zn, Cu, B, Mo, and Cl as essential, excluding nickel. This question reflects that traditional classification.

Carbon, hydrogen, oxygen, and nitrogen constitute approximately 99% of living matter by mass. Carbon forms the backbone of organic molecules, hydrogen and oxygen are abundant in water and organic compounds, and nitrogen is essential for proteins and nucleic acids. Sulfur and phosphorus, while important, are present in much smaller quantities than these four.

Elements used in large quantities by the plant are termed macronutrients, which can be further defined as primary and secondary. The primary nutrients include nitrogen (N), phosphorus (P) and potassium (K). These elements contribute to plant nutrient content, function of plant enzymes and biochemical processes, and integrity of plant cells. Deficiency of these nutrients contributes to reduced plant growth, health and yield. Thus, they are the three most important nutrients supplied by fertilizers. The secondary nutrients include calcium (Ca), magnesium (Mg) and sulphur (S).

Active uptake of minerals against their concentration gradient requires energy expenditure, typically in the form of ATP. This is fundamental to active transport mechanisms. While respiration produces this energy and root metabolism supports the process, the direct requirement for mineral uptake is the energy itself. Photophosphorylation occurs in chloroplasts for photosynthesis, not mineral absorption.