To solve the problem, we need to identify the element that is important in determining solute concentration and oxygen evolution.
1. Understanding the Question:
The question is asking for the element that plays a crucial role in processes related to solute concentration and oxygen evolution, which are key in biological and chemical systems, particularly in photosynthesis.
2. Analyzing the Elements:
Each option refers to an element that might have a role in these processes:
3. Conclusion:
Chlorine is the element most relevant to the question, as it is involved in both solute concentration regulation and the process of oxygen evolution in photosynthesis.
Final Answer:
The correct answer is (D) Chlorine.
"Vanishing Greenery; A Growing Urban Crisis" In most of our cities, rapid urbanisation has led to a significant decrease in greenery over the past two decades. As the population increased, the demand for housing, roads and commercial buildings grew, leading to clearing of parks, gardens, and natural resources. This has contributed to several problems. 
(a) Mention one significant problem caused by the reduction in urban greenery.
(b) How do green plants contribute to improving the air quality?
(c) What role can you, as a citizen, play in protecting urban greenery?
