Which of the following nutrients is considered essential for green plant growth?

Nitrogen is regarded as an essential nutrient for green plant growth because it plays a critical role in several fundamental biological processes. It is a key component of amino acids, which are the building blocks of proteins, and proteins are vital for cell structure and function. Nitrogen is also an integral part of nucleic acids, such as DNA and RNA, which are essential for cell division and reproduction. Additionally, nitrogen is a significant part of chlorophyll, the pigment responsible for photosynthesis, allowing plants to convert sunlight into chemical energy. Without adequate nitrogen, plants exhibit stunted growth, yellowing leaves, and poor overall health, underscoring its importance in promoting lush and vigorous plant development.