Final answer:
The main water source for land plants is soil. Plants absorb water through root hairs and transport it throughout the plant using the xylem. This process is essential for photosynthesis and other vital plant functions.
Step-by-step explanation:
Soil is the main water source for land plants, comprising 80 to 90 percent of the plant's total weight. Plant roots absorb water from the soil through root hairs and transport it up to the leaves through the xylem. As water vapor is lost from the leaves through transpiration, more water is drawn from the roots up through the plant to the leaves.
The main water source for land plants is soil. Soil contains water that, even if it appears dry, can be an abundant source of water for plants. Through the process known as transpiration, water enters the plant through root hairs and is transported up to the leaves through the xylem. The water is essential for photosynthesis, the food production process in plants, and for other key functions such as support of cell structure, metabolism, and transport of nutrients. As the water evaporates from the leaves, it helps to draw more water up from the roots.