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Each step: 0.5Mark
The following steps can be taken to conserve water:
1. Immediately repair any leaking tap in the household.
2. Close the tap while brushingteeth.
3. Used household water can be used for watering plants.
4. Avoid using a shower and use a bucketful of water instead.

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Definition:1 Mark
Answer: 1 Mark
The underground surface below which the ground is wholly saturated with water is the water table.
Yes, groundwater is fit for consumption as it is a source of freshwater.

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Explanation of water cycle: 3 Marks
Rivers, lakes, ponds and other sources get water from precipitation and melting of glaciers. The water from these sources along with precipitation replenishes the groundwater through infiltration. The groundwater runs off into the seas and the water on the surface reaches the seas through rivers.
From the sea, the water evaporates, reaches the atmosphere and forms clouds. Some ground water also reaches the atmosphere through evaporation and transpiration.
The clouds are responsible for precipitation or rains and thus the water again reaches the rivers, lakes, and ponds.
So, the water in these resources keeps flowing and never gets over.

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Completing the diagram: 2 Marks
Explanation: 3 Marks

Water cycle can be explained through the following diagram,

Waterfrom the sea goes into the atmosphere through evaporation. There it gets converted into cloud through condensation. From the clouds, it reaches the ground through precipitation. It goes into groundwater through infiltration (seeping through the pores of soil) and from there it goes into the sea through groundwater runoff. So, waterneeds to follow these steps to complete the cycle.

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Explanation: 3 Marks
Waterseeps through spaces in the soil and gets collected in the cracks and spaces deep below the ground over porous rocks. This collected water forms a part of thegroundwater and some droplets go further down and get collected over impervious rocks to form aquifers.
Water in the aquifers can bepumped out with the help of tube wells or handpumps.

Answer: Option C. -> Lake water < Well water < Rainwater
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C
Rainwater is the purest form of natural water. Water from the water bodies such as lakes, ponds get evaporated leaving behind the impurities. The condensed water vapour is the most pure form of water among all the sources of natural water.
Underground is next only to rainwater in terms of purity. It contains dissolved impurities.
River and lake water contains dissolved impurities like salts, and insoluble impurities like clay, sand and living organisms (including microbes).
Therefore, the correct of purity from the given water sources is:
Lake water < Well water < Rainwater

Answer: Option B. -> False
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B
The water table is at different depths in different places. For instance, to reach the water table in Rajasthan one might have to dig around 20 feet into the ground whereas one will have to digaround 10 feet onlyin Meghalaya.

Answer: Option A. -> Water table decreases
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A
With the increase in population, the demand for groundwater increases as every human being needs a minimum amount of water for his/her sustenance and daily activities. Thus, the water table eventually decreases.
However, we can adopt techniques such as rainwater harvesting to maintain the level of groundwater.

Answer: Option C. -> X:- Evaporation, Y:- Precipitation
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C
Evaporation (X):- It is a phase transitionin which the liquid converts into gas. For example, water converts intowater vapour.
Precipitation (Y):- After the condensation of water vapour, it falls on the surface of the earth. Most of the precipitation occurs in the form of rain, but also includes snow, hail etc.
The figure represents the water cycle, whichalso includes condensation(the process in which the evaporated water vapour converts to liquid water droplets in the air, forming clouds).
The sequence of processes is:
Evaporation $\to$ Condensation $\to$ Precipitation

Answer: Option A. -> True
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A
Humans have been blessed with groundwater but lately, due to mismanagement of this boon, we have started facing acute shortage offreshwater, which results in thedepletion of thewater table.