Agronomy Degree Practice Exam

What is one of the key functions of phosphorus in plants?

1. Increasing crop quality

2. Reduces lodging

3. Energy transfer

4. All of these

The correct answer is: All of these

Phosphorus plays a critical role in many aspects of plant growth and development, making it an essential nutrient. Its function in energy transfer is particularly significant, as phosphorus is a key component of adenosine triphosphate (ATP), which is necessary for energy transfer within cells. This process is vital for various metabolic reactions, including photosynthesis and cellular respiration. Moreover, phosphorus is involved in the formation of nucleic acids like DNA and RNA, which are crucial for cell division and growth. By facilitating these cellular processes, phosphorus contributes to the overall quality of crops and can enhance traits such as yield and resistance to diseases. While phosphorus may not directly reduce lodging, it does help strengthen plant tissues and contribute to robustness, which can lead to improved structural integrity in crops. Thus, phosphorus influences various aspects of plant health and productivity, supporting the notion that it is involved in energy transfer, quality enhancement, and potentially factors related to lodging, among others. This holistic view reflects why the selection encompassing all these functions captures the importance of phosphorus in plant growth effectively.