Basic Science Solutions for Class 6 Science Chapter 16 Water are provided here with simple step-by-step explanations. These solutions for Water are extremely popular among Class 6 students for Science Water Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Basic Science Book of Class 6 Science Chapter 16 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Basic Science Solutions. All Basic Science Solutions for class Class 6 Science are prepared by experts and are 100% accurate.

Page No 162:

Answer:

Water is the most abundant compound on earth. Its main uses are:

(a) It takes part in biochemical reactions.
(b) It acts as a medium for the processes inside the body of a living organism.
(c) It acts as a coolant to regulate body temperature.

Page No 162:

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Water takes part in photosynthesis. It is a biochemical reaction that occurs in green plants.



Page No 163:

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This means that wheat requires 500 litres of water for producing one kilogram of wheat grain.

Page No 163:

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Industrial uses of water:
(a) It acts as a solvent.
(b) It is used for disposal of waste.
(c) It is used as a coolant.

Page No 163:

Answer:

The reservoir of ground water is formed by the rain water that percolates through soil and seeps down to the rocks up to a saturated zone.

Page No 163:

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Precipitation is the deposition of water from the atmosphere on earth in any form i.e. liquid or solid.

Page No 163:

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Rainwater harvesting is a method of conserving water by making use of rainwater instead of wasting it.

Page No 163:

Answer:

Evaporation is a process by which a liquid changes to gaseous state. It may occur at or below the boiling point of the liquid.

Page No 163:

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Put equal amounts of water in the dish and the glass. Let the water evaporate in sun. Note the time of evaporation of water from both the glass and the dish. The water in the dish is spread over a large surface; therefore, it will evaporate faster from the dish as compared to the glass. This is because evaporation occurs faster if the surface area is large.

Page No 163:

Answer:

Evaporation increases when there is high heat or high temperature.
Evaporation increases when there is low humidity because humid air takes up less water than dry air.
Evaporation is more during droughts because the climate is dry.

Page No 163:

Answer:

Fog Cloud
Water vapours condense at a very low height to form fog. Water vapours condense at a very high height into droplets to form cloud.
Fog extends up to three-fourths of a kilometre above the ground. Cloud extends more than a kilometre above the ground.

Page No 163:

Answer:

If there is little or no rainfall, it leads to a situation called drought. In such a situation, the crops of the place get destroyed due to the shortage of water. Rivers, lakes, ponds and wells dry up. There is also a scarcity of drinking water.

Page No 163:

Answer:

Water is important in agriculture due to the following reasons:

(a) It is required by plants for photosynthesis.
(b) It helps plants absorb minerals from the soil.
(c) It helps in the transportation of substances within plants.

Page No 163:

Answer:

Take equal amounts of water in two same dishes. Place one of the dishes under a moving fan and keep the other dish away from the fan. The water placed under the fan evaporates faster than the water placed away from the fan. This is because an air current continuously blows away water vapours that are formed and helps in the formation of fresh water vapours. This leads to faster water evaporation.
Example: A wet cloth dried under a fan dries faster than a wet cloth being dried without fan.

Page No 163:

Answer:

Snow is formed in the clouds that are very high. In these clouds, water freezes into crystals of ice as it is very cold there. When these crystals become very heavy, they fall as snow. Hailstones are formed when the rain gets frozen on passing through a very cold layer of air.

Page No 163:

Answer:

When rain falls on the land, it gets accumulated and causes water logging. Continuous, heavy rain for several days causes flood and soil erosion.
Rainwater harvesting is a method of using rainwater. To collect rainwater, pits and tanks are dug in low-lying areas. The collected water is filtered, disinfected and then supplied for consumption.

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(c) Evaporation followed by condensation

Water from the land evaporates in the form of water vapours. These water vapours get condensed in the air to form small droplets of water that form clouds.

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(d) River

River is not a form of precipitation.

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(c) constant

The amount of water on earth is almost constant and it is maintained by water cycle.

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(c) Melting of mountain snow

Melting of mountain snow is not related to drought.

Page No 163:

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(d) Falling of the water table

Water table rises during floods.

Page No 163:

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1. Chemical reactions that take place in living beings are called biochemical reactions.
2. Water helps in the transport of substances within the body of plants and animals.
3. Loss of water by evaporation from plants is called transpiration.
4. The hotter the liquid, the faster is its evaporation.
5. All rivers finally merge with the oceans.
6. When water-logging takes place, earthworms and snakes come out in search of air.



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