Fluorine
Potassium
Lead
Aluminium
Answer is Right!
Answer is Wrong!
The correct answer is B. Potassium.
Potassium is an essential element for plant growth. It is involved in many important plant processes, including photosynthesis, protein synthesis, and water transport. Potassium fertilizers are used to supplement the potassium levels in soil, which can be depleted by crop production.
Fluorine is not used in the manufacture of fertilizers. It is a highly reactive element that can be toxic to plants.
Lead is also not used in the manufacture of fertilizers. It is a heavy metal that can be toxic to plants and animals.
Aluminium is not used in the manufacture of fertilizers. It is a relatively inert element that does not have any known beneficial effects on plant growth.