lesson 7 water (WWS)

state is the statement given below correct

" Water is not the solid of life. "

• Yes

• No

• Maybe

• Never

Answer explanation

Ans: Water is the liquid of life as we cannot survive without water.

Fill in the blank with any 2 suitable options

" One molecule of water is composed of two

atoms of ________ and one atom of ______.

• hydrogen , oxide

• hydrogen , nitrogen

• hydrogen , oxygen

• nitrogen , potash

Hydrogen and ______ are present in a fixed

proportion of _ is to _ in a water molecule,

Only about 1% of water on the earth's surface is available and suitable for use

by living beings.

• True
• False

Answer explanation

Only about 1% of water on the earth's surface is available and suitable for use

by living beings.

What is the percentage of water in the human body ?

• 67%

• 80%

• 70%

• 60%

Answer explanation

This is as in the human body only 70% is water and 30% is the muscles and tissue and other organs.

Even dry grains like wheat, rice, pulses contain _% to _% of water.

what is the percentage of carbon dioxide in air.

• 0.1%to 0.2%

• 0.5% to 0.6

• 0.03% to 0.04%

• 1%to 2 %

___ water contains a large amount of dissolved _________, but mostly common salt.

The process of removal of the dissolved salts from sea/ocean water is called ____________.

• desalination

• desatlation

• excretion

• evaporation

Select any 3 uses of water from the following

• Water regulates our body temperature by the process of sweating and evaporation.

• Water is saline and has many chemicals in it.

• Water also controls the earth's climate.

• Water helps our body stay regulated

• Large number of plants and animals live ni

  water. They take up nutrients and oxygen dissolved in water for their survival.