Multiple choice

The major source of water used by plants is

  1. capillary water

  2. hygroscopic water

  3. gravitational water

  4. inner space water

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Capillary water is the water held in soil pores against gravity but available for plant absorption. It's the primary water source plants use through their roots. Hygroscopic water is too tightly bound, gravitational water drains away quickly, and 'inner space water' is not a standard scientific term.