Answer in one line

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Last edited 25 days ago by Learn LoopHQ.

Chapter: 05. Water

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Answer in one line

What percentage of the Earth’s surface is covered with water?

Two-thirds of the Earth’s surface is covered with water.

What two elements combine to form water?

Water is made up of hydrogen and oxygen elements.

Name the three states in which water can exist.

Water can exist in solid (ice), liquid (water), and gaseous (vapour) states.

Why is water called a universal solvent?

Water is called a universal solvent because a large number of substances dissolve in it.

What is the primary source of water in rivers and lakes?

The water in rivers and lakes primarily comes from rain and the melting of snow on mountains.

Why is saline water not suitable for plant growth?

Saline water is not suitable for plant growth because its high salt concentration hinders the plant’s ability to absorb water and nutrients, leading to poor growth or death.

How is underground water obtained for use?

Underground water is obtained by digging deep wells, tube wells, and using hand pumps.

What is the main difference between dew and frost?

Dew consists of tiny water droplets formed by condensation, while frost is formed by the freezing of dew.

How does the water cycle help maintain water on land?

The water cycle maintains water on land by restoring the water lost from the surface of the earth through continuous evaporation, condensation, and precipitation.

Why does ice float on water?

Ice floats on water because water exhibits anomalous expansion, meaning it expands when cooled below 4°C, making ice less dense than liquid water.

List two ways water is useful for plants.

Water helps in the germination of seeds and growth of plants, and it is necessary for plants to make food through photosynthesis.

Mention two non-domestic uses of water, besides agriculture and electricity production.

Two non-domestic uses of water include transportation (by boats and ships) and cooling engines in vehicles.

What are two characteristics of potable water regarding its appearance?

Potable water should be colourless, transparent, and odourless.

How does boiling help in water purification?

Boiling water for 10-15 minutes helps in water purification by destroying harmful microorganisms.

What is the main difference between a solute and a solvent?

A solute is a substance that dissolves in another substance, while a solvent is the substance in which the solute dissolves.

How does heating affect the dissolving of a substance in water?

Heating generally helps in dissolving a substance faster in water and increases its solubility.

Name two common water pollutants from homes and industries.

Two common water pollutants are domestic sewage discharged from homes and industrial waste discharged from factories.

What is the role of carbon aerogel in controlling pollution?

Carbon aerogel can absorb oil spills, being capable of absorbing 900 times its own weight, thus helping to control pollution caused by oil spills.

Name two methods of irrigation that conserve water.

Drip irrigation and sprinkle irrigation are two methods that conserve water by preventing wastage.

What is a flood and what is one of its effects?

A flood is the collection of huge amounts of water due to heavy rain and overflowing rivers; one effect is the submerging of low-lying areas and damage to crops.

What is a drought and what is one of its effects?

A drought is a condition of dry weather with very little or no rain for a long duration; one effect is that animals die due to a shortage of water.

Why is distilled water not considered good for drinking?

Distilled water is not good for drinking because it does not contain the essential minerals required by the body and is tasteless.

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