CBSE Class 7 Science Water A Precious Resource Assignment

Class 7 Science Practice Assignments: CBSE Class 7 Science Water A Precious Resource Assignment

Review targeted academic assignments with the CBSE Class 7 Science Water A Precious Resource Assignment. Built according to official CBSE standards for the 2026-27 term, these downloadable Class 7 Science worksheets support effective daily practice for Chapter 16 Water A Precious Resource.

Download Chapter 16 Water A Precious Resource Assignment PDF with Solutions

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Water - A Precious Resource 

ACTIVITY- 16.1 ` 
 
Question 1- Name three activities by which water is being wasted? 
Answer- Cleaning of houses and animals, washing car and opening tap during brushing our teeth. 
 
Question 2- Should we check the wastage of water and why? 
Answer- Yes, because there are very limited sources of fresh water on earth. 
 
Question 1- ________ is the process by which water is converted from its liquid state to a gaseous state. 
Answer- Evaporation.  
 
Question 2- ________ is the process by which water is converted from its gaseous state to a liquid state. 
Answer- Condensation. 
 
ACTIVITY- 16.2 
 
Question 1- Which beaker represents the underground water? 
Answer- Beaker ‘C’. 
 
Question 2- Which beaker represents the surface water? 
Answer- Water remained in beaker ‘A’. 
 
EXERCISE 
 
Question 1- Fill In The Blanks : 
 
(i). The water we drink is in liquid state. 
 
(ii). The process of seeping of water into the soil is called infiltration. 
 
(iii). The upper level of ground water is called water-table. 
 
(iv). Water management means dealing with water in the best possible ways. 
 
(v). A farmer can use water economically in the field, by drip irrigation. 
 
 
Question 2- Write True Or False. 
 
(i). Water cycle helps in maintaining water on the earth. (True) 
 
(ii). About 97% of total water present on the earth is fresh water. (False) 
 
(iii). Repair leaking taps and pipes at the earliest. (True) 
 
(iv). We are quickly moving towards global water crisis. (True)
 
(v). Turn on taps while brushing. (False) 
 
 
Question 3- Match The Column:-
 
 Column I                           Column II
(i) Ice                               (a). Oceans and sea
(ii) Saline water                 (b). Rivers and ponds
(iii) Fresh water                 (c). Gaseous state of water
(iv) Water vapour              (d). Purest form of water
(v) Rain water                   (e). Solid state of water
 
 
Question 4. Choose One Option For The Follwing.
 
(i). Which of the following is responsible for depletion of ground water?
 
a) Increasing population
b) Increasing industries
c) Deforestation
d) All of these (✓)
 
(ii). The Punjab preservation of subsoil water act was passed in the year:
 
a) 2009 (✓)
b) 2010
c) 200l
d) 2015
 
(iii). The world water day is celebrated every year on:
 
a) 22 April
b) 24 March
c) 22 March (✓)
d) 22 May
 
(iv). Oceans and sea cover about ………. of the earth surface.
 
a) 75%
b) 71%
c) 97% (✓)
d) 29%
 
(v). We should not keep taps running while:
 
a) Brushing
b) Shaving
c) Bathing
d) All of these (✓)
 
 
Question 5- Very Short Answer Type Questions.
 
(i) What do you mean by ground water?
Answer- Groundwater is the water present below the earth’s surface in the cracks and spaces in soil, sand and rocks.
 
(ii) Why is sea and ocean water not fit for drinking?
Answer- Because sea and ocean water have large amounts of dissolved salts.
 
(iii) Define aquifers.
Answer- Groundwater present between the layers of hard rocks below the water table is known as aquifer.
 
(iv) Name the three states of water.
Answer- Solid, liquid and gas.
 
(v) How is groundwater recharged?
Answer- Rainwater and water from other sources such as rivers and ponds seeps into the soil due to gravity until the empty spaces and cracks deep below the ground are filled with water. This process is known as infiltration. Hence groundwater gets recharged.
 
 
Question 6- Short Answer Type Questions.
 
(i) Enlist some activities by which water is being wasted by people.
Answer- Water is being wasted by people in cleaning of houses and animals, washing car and opening taps during brushing teeth.
 
(ii) How will you minimize the use of water to maintain a garden?
Answer- We should water the garden early in the morning and late afternoon taking shorter showers. We should reuse the waste water of cleaning purposes in watering the plants.
 
(iii) How is water important to us?
Answer-
(1). About 70% of human body consists of water.
(2). Water helps to control our body temperature.
(3). Water helps to excrete waste products from our body.
(4). Water is important for growth of plants.
(5). Water maintains the temperature of earth.
(6). Water is essential for our many daily life activities.
 
(iv) How increase in human population is leading to depletion of water table?
Answer- As the human population increase, consumption of water by them increases for their daily activities.Often groundwater is used for construction of houses, shops and roads etc. Hence groundwater is used at high rate, but the area for seepage of water decreases. So water table is depleted by growth in human population.
 
(v) Why do plants wilt and finally dry up if they do not get water for some days?
Answer- Plants use water in photosynthesis. Also plants lose some water by transpiration. So if plants do not get water for some days, they wilt and finally dry up.
 
 
Question 7- Long Answer Type Questions.
 
(i) What steps will you take to save water?
Answer-
(1) Make efforts to stop the leakage of water from taps and water pipes.
(2) Turn off taps while brushing or shaving.
(3) Mop the floor instead of washing, reuse the waste water to water the plants.
(4) Water the garden early in the morning and late afternoon taking shorter showers.
(5) Wash vegetables and fruits in big containers and use this water for cleaning or watering the plants.


Water - A Precious Resource

Q.1. Fill in the blanks
1. 22 March is celebrated as the ‘World Water day’.

Question 1. 22 March is celebrated as the ‘World ____________ day’.
Answer: Water
In simple words: World Water Day is observed globally on 22nd March every year to highlight the importance of freshwater.

Exam Tip: Remember important dates related to environmental awareness as they frequently appear in exams.

 

Question 2. _____% of the Earth’s surface is covered with Water.
Answer: 71
In simple words: About 71 percent of the Earth's surface is covered with water, mostly in oceans and seas.

Exam Tip: Keep in mind that while 71 percent of Earth is water, only a very small fraction is usable freshwater.

 

Question 3. _____________ was the traditional way of collecting water.
Answer: Bawri (or Rainwater harvesting / Baoli)
In simple words: Traditional systems like stepwells (bawris) were used in ancient times to store rainwater for dry periods.

Exam Tip: Mention traditional structures like 'Bawri' or 'Baoli' for accurate terminology.

 

Question 4. Water exists in three forms : (i)_________________, (ii) _____________ and (iii) ___________.
Answer: (i) Solid, (ii) Liquid, (iii) Gas (or Ice, Water, Water vapour)
In simple words: Water is unique because it is naturally found in all three states of matter on Earth.

 

Question 5. Water management is a practice to minimize ____________ of water.
Answer: wastage
In simple words: Efficient water management ensures proper distribution and stops unnecessary loss or misuse of water.

Exam Tip: Focus on keywords like 'wastage' and 'conservation' when discussing water management.

 

Q.2. State whether True or False :

Question 1. Infiltration is the process of seeping of water into the empty spaces of ground.
Answer: True
In simple words: Water from rain seeps into the ground through soil pores during infiltration.

Exam Tip: Understand the difference between infiltration (seeping into soil) and groundwater (stored water underneath).

 

Question 2. Collection and conservation of rainwater from the rooftop of buildings and industries is known as rainwater harvesting.
Answer: True
In simple words: Rooftop rainwater harvesting is an effective method to capture and store rainwater for future use.

Exam Tip: Rainwater harvesting helps recharge groundwater tables effectively.

 

Question 3. 30 March is celebrated as the World Water Day.
Answer: False (Correct statement: 22 March is celebrated as World Water Day)
In simple words: World Water Day is celebrated on 22nd March, not 30th March.

Exam Tip: Be careful with dates in True/False statements as they are often intentionally altered.

 

Question 4. We can drink sea water because of its salt content.
Answer: False (Correct statement: We cannot drink sea water because of its high salt content)
In simple words: Sea water is saline and unfit for direct human consumption.

Exam Tip: High salinity makes marine water undrinkable without desalination treatment.

 

Question 5. The process of infiltration recharges the groundwater.
Answer: True
In simple words: Infiltrated water percolates deep down and replenishes the groundwater reserves.

Exam Tip: Infiltration plays a crucial role in maintaining the natural water cycle and groundwater levels.

 

Question 3. Write some methods to conserve water at home :
Answer:
1. Moping floor instead of washing.
2. Washing vehicles using bucket.
3. Turning off the tap while brushing teeth.
4. Fixing leaking taps and pipes immediately.
5. Using leftover water from washing vegetables to water potted plants.
6. Taking shorter showers or using a bucket instead of a shower.
7. Installing water-efficient fixtures and appliances.
In simple words: Small daily habits at home can save huge amounts of precious water.

Exam Tip: Provide practical, realistic household habits when asked about water conservation methods.

 

Question 4. Match the given numbers with the processes given in the jumbled form :
1. loras_reengy
2. duclos
3. atooniaervp
4. ntciepirtaipo
5. eas_terwa
Answer:
1. Solar energy (matching with number 1 in the diagram representing the sun)
2. Clouds (matching with number 2 in the diagram representing cloud formation)
3. Evaporation (matching with number 3 in the diagram representing water turning to vapor)
4. Precipitation (matching with number 4 in the diagram representing rainfall)
5. Sea water (matching with number 5 in the diagram representing the ocean/sea)
In simple words: Unscrambling the letters reveals key terms related to the water cycle shown in the diagram.

Exam Tip: Always look at the reference numbers in the accompanying diagram to correctly pair jumbled hydrological terms.

 

Diagram NumberJumbled TermCorrect Process / Term
1loras_reengySolar energy
2duclosClouds
3atooniaervpEvaporation
4ntciepirtaipoPrecipitation
5eas_terwaSea water

 

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Download Practice Assignments: Class 7 Science Chapter 16 Water A Precious Resource

Revision Assignment: Chapter 16 Water A Precious Resource (CBSE)

Review targeted chapter assignments for Class 7 Science Chapter 16 Water A Precious Resource. Built according to official CBSE guidelines, these downloadable problem sets help students build accuracy and prepare effectively for school tests.

Key Advantages of Solving Chapter 16 Water A Precious Resource Assignments

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How to Approach Science Chapter 16 Water A Precious Resource Assignments

  1. Concept Foundation: Review the NCERT book for Class 7 Science thoroughly before diving into assignment tasks.
  2. Self-Evaluation: Solve exercises independently before inspecting professional answer guides.
  3. Progress Monitoring: Note down complex formulas or concepts, clearing them up using available online practice aids.

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