Multiple choice

The soil water which is of the greatest importance to the plant life is

  1. Gravitational water

  2. Capillary water

  3. Hygroscopic water

  4. Combined water

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

Capillary water is held in the soil pores against gravity and is the primary source of water available for plant root absorption. Gravitational water drains away, while hygroscopic and combined water are held too tightly by soil particles for plants to extract.