Transport in Plants Question 30
30. In soil, the water available for root absorption is
[1991, 99]
(a) gravitational water
(b) capillary water
(c) hygroscopic water
(d) combined water
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Answer : b
Hints & Solutions
(b) After rain a portion of water percolates downward under the influence of gravity. It is not available to plants. Hygroscopic water is also not available for plants because soil particles hold water by strong attractive forces. Chemically bound water is water combined with chemicals. Capillary water is present in narrow spaces of soil and is held in soil by capillary forces and is absorbed by root.
