Final answer:
The odd one out among the options given is Chlorophyll content. Temperature, age of leaf, and structure of leaf are all related to the characteristics and properties of leaves, while chlorophyll content is a specific feature of the leaf's composition.
Step-by-step explanation:
The odd one out among the options given is B. Chlorophyll content. Temperature, age of leaf, and structure of leaf are all related to the characteristics and properties of leaves, while chlorophyll content is a specific feature of the leaf's composition. Temperature affects the rate of photosynthesis and overall plant growth, age of leaf can impact its ability to photosynthesize efficiently, and the structure of leaf determines its shape and function.