Here's why:
* Water absorption is driven by osmosis: Plants absorb water primarily through their roots, and this process is driven by osmosis. Osmosis is the movement of water from an area of high concentration to an area of low concentration, across a semipermeable membrane (the root cell walls).
* Sunlight isn't directly involved in osmosis: While sunlight is crucial for photosynthesis (the process plants use to make food), it doesn't directly influence the movement of water into the plant.
* Roots are always working: Even when it's dark, plants still need water for essential processes like cell growth and maintaining turgor pressure (which keeps the plant upright).
However:
* Sunlight indirectly affects water absorption: Photosynthesis creates sugars that plants use as fuel. These sugars can stimulate root growth and increase the surface area available for water absorption.
In short: While sunlight isn't directly involved in water absorption, it plays an indirect role in supporting the process. Plants will continue to absorb water even when there is no sunlight.
