Final answer:
Source tissues in plants, like leaves, produce carbohydrates, while sink tissues like roots and fruits consume or store these carbohydrates.
Step-by-step explanation:
In the context of plant biology, source tissues are the parts of the plant that produce or store carbohydrates through the process of photosynthesis, such as the leaves and green stems. On the other hand, sink tissues are parts of the plant where the carbohydrates are consumed or stored, such as roots, fruits, and developing leaves. Examples of source tissues include mature leaves, while examples of sink tissues include tubers like potatoes, bulbs like onions, and fruit such as apples and oranges which store the carbohydrates.