BIOC40H3 Lecture Notes - Gravitational Potential, Water Potential, Xylem

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Water is essential in the life cycle of plants. Since photosynthesis utilizes co2 that enters the leaves via open stomates on the lower leaf surface, the leaves are also exposed to water loss and the threat of dehydration through the common diffusional pathway. Water must be absorbed by the roots and transported through the plant body to prevent leaf desiccation. Balancing the uptake, transport, and loss of water to the atmosphere is an important challenge for plants. 97%) of the water absorbed by plant roots evaporates from leaf surfaces this process is called transpiration. Of the remaining water, about 2% is used for growth and the last 1% is consumed in the biological reactions of photosynthesis and other metabolic processes. Remember that plant cells have cell walls which animal cells do not. The presence of cell walls has an important impact on water balance within the plant.

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