What is transpiration in plants?

Transpiration is best described as the evaporation of water from plant leaves. This process occurs primarily through small openings called stomata, which are found on the leaves' surfaces. During transpiration, water absorbed by the roots moves up through the plant, ultimately being released into the atmosphere. This not only helps in regulating the plant's temperature but also plays a crucial role in nutrient uptake and maintaining the plant's water status.

The other options refer to different processes in plant biology. Nutrient absorption from soil involves the roots and is a separate process that ensures plants obtain essential minerals. The conversion of light energy to chemical energy is accomplished through photosynthesis, which occurs in the chloroplasts and is fundamental for plant growth and development. Seed dispersal refers to the mechanisms by which plants spread their seeds to ensure their propagation, and it is unrelated to transpiration. Thus, option B clearly captures the essence of what transpiration entails in the context of plant functions.