Page 77 - ICSE Chemistry 6

ocean river stream
Fig. 4.3: Surface water

Activity 4.2

Aim: To show that plants require fresh water
Materials required: 2 po ed plants, saline water, tap water

Procedure
• Take two healthy po ed plants and keep them in sunlight.
• Water one plant with ordinary tap water and the other with saline water (water containing salt) for
a few days.
Observa on: The plant watered with saline water did not grow well as compared to the plant watered
with tap water.
Conclusion: This shows that plants require fresh water for proper and healthy growth.

Groundwater

Some part of the rainwater falls on land, i.e., soil and gets collected under the ground. The water so
collected under the ground is called groundwater or undergroundwater. The level of water under the
ground is called water table. Water table varies according to the place and season. Groundwater is purer
as it gets fi ltered through many layers of sand, rocks and soil. It contains dissolved salts and is normally
free from suspended impuri es.
Groundwater is found in wells and springs. Well water is the pool of Impervious Layer
water that is obtained by digging the soil ll its impervious layer. The The layer that does not allow
water which comes out with pressure in the form of spring from any liquid or gas to pass through is
opening in the earth cons tutes the spring water. Groundwater can called the impervious layer.
also be drawn by handpumps and tube wells or bore wells.

well spring handpump tube well
Fig. 4.4: Sources of groundwater

63