Physical classification of water

Hygroscopic water

This is the water present in an air dry soil held tightly by soil solids at a suction pressure greater than 3.1 bar. This type of water cannot be removed by evapouration and roots of higher plants. Only microbial activities have been found to take place here.

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problem of plant living in fresh water habitat

Buoyancy The density of fresh water is considerably less than that of the sea and such floatation is a greater problem for fresh water plankton. There is occasional flooding which submerges the plants. The water lilies, water lettuce, water hyacinth are able to stay afloat because of the air spaces in the lower part of the leaves as well as in the skins and roots.

SCIENCE is life

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