The correct answer is C. Chlorine.
Nitrogen, hydrogen, and phosphorus are all essential elements for plant growth. Nitrogen is used to build proteins and nucleic acids, hydrogen is used to build carbohydrates and lipids, and phosphorus is used to build nucleic acids and ATP. Chlorine is not an essential element for plant growth, and in fact, it can be toxic to plants in high concentrations.
Nitrogen is the most important element for plant growth. It is a component of proteins, nucleic acids, and chlorophyll. Nitrogen is also involved in the production of energy and the regulation of plant growth.
Hydrogen is a component of carbohydrates, lipids, and proteins. Hydrogen is also involved in the production of energy.
Phosphorus is a component of nucleic acids, ATP, and phospholipids. Phosphorus is also involved in the production of energy and the regulation of plant growth.
Chlorine is not an essential element for plant growth. In fact, it can be toxic to plants in high concentrations. Chlorine can interfere with the uptake of other essential elements, such as potassium and calcium. It can also damage plant cells.
In conclusion, the element not present in fertilizers is C. Chlorine.