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5th Science Guide Term 2 Water

5th Science Guide Term 2 Water

TN Class 5 Science Guide Term 2 Lesson 2 Water Book Back Answers

5th Science English Medium Guide. 5th Science Term 2 Lesson 2 Water Book Back and Additional Questions and Answers. TN Samacheer kalvi guide Science Solutions. 5th All Subject Text Books Download pdf. Class 5 / Fifth Standard Term 1 Lesson 1 Organ System question answers. Class 1 to 12 Book Back Guide.

5th Std Science Guide Term 2 Unit 2 Water – English Medium – Book Back Answers

I. Choose the correct answers:

Question 1.

Which of the following microorganisms causes waterborne diseases?

  1. a) Bacteria
  2. b) Virus
  3. c) Protozoa
  4. d) All

Answer:(d) All

Question 2.

Water is present in huge quantities as vapor and clouds in the

  1. a) sky
  2. b) earth
  3. c) atmosphere
  4. d) rain

Answer:(c) Atmosphere

Question 3.

________ water is free from suspended impurities.

  1. a) Sea
  2. b) Well
  3. c) River
  4. d) Underground

Answer:(d) Underground

Question 4.

________ of water is in oceans and seas.

  1. a) 97%
  2. b) 87%
  3. c) 47%
  4. d) 77%

Answer:(a) 97%

Question 5.

________ is an artificial process of converting seawater into freshwater.

  1. a) Distillation
  2. b) Decantation
  3. c) Reverse Osmosis
  4. d) Desalination

Answer:(d) Desalination

II. Fill in the blanks:

Question 1.

The accumulated underground water comes out in the form of ________.Answer:A Spring

Question 2.

The process of changing water into water vapor by the heat of the Sun is called ________.Answer:Evaporation

Question 3.

Rainwater forms streams and ________ which join together to form rivers.Answer:springs

Question 4.

The process of collecting and storing rainwater is called ________.

Answer:Rainwater harvesting

Question 5.

Cholera is caused by ________.Answer:Bacteria (Vibrio Cholerae)

III. Match the following:


IV. Answer briefly:

1. Write down the sources of water.


  • River water and lake water
  • Seawater
  • Well water
  • Springwater
  • Underground water

2. What is desalination?


  • Desalination is an artificial process of converting saline water (seawater) into freshwater.

3. What are the processes involved in the water cycle?


Water cycle consists of the following four processes:

  • Evaporation
  • Condensation
  • Precipitation
  • Flowing back to oceans.

4. What are reservoirs?


  • A reservoir is an artificial/man-made lake, where water is stored. Most reservoirs are formed by constructing dams across rivers. A reservoir can also be formed from a natural lake.

5. How can we prevent dengue fever?


We can prevent dengue fever by the following steps:

  • Spray the house with anti-mosquito spray.
  • Try to wear clothes that cover skin areas.
  • Close the doors and windows during early morning and evening.
  • Do not leave stagnant water lying anywhere in and around the house.

V. Answer in detail:

1. Write the advantages of rainwater harvesting.



  • Rainwater harvesting can reduce flooding in the cities.
  • Rainwater harvesting can reduce top soil loss.
  • Groundwater level can be increased.
  • Groundwater can be conserved.
  • It can improve plant growth.

2. How can we prevent waterborne diseases?


  • Good personal hygiene should be practiced and basic sanitation should be improved.
  • Chlorinated and boiled water should be used for drinking.
  • Drink boiled or pasteurized milk.
  • Dispose of infectious wastes properly.

5th Science Guide Water Additional Questions and Answers

I. Choose the correct answer:

Question 1.

The origin of river is ______.

(a) plains

(b) mountains

(c) valley

(d) ocean

Answer:(b) Mountains

Question 2.

______ is called saline water.

(a) Seawater

(b) River water

(c) Well water

(d) Underground water

Answer:(a) Seawater

Question 3.

______ of the world population does not get safe drinking water.

(a) 24%

(b) 25%

(c) 26%

(d) 27%

Answer:(b) 25%

Question 4.

_________ million people die worldwide every year due to diarrhoeal diseases.

(a) 1

(b) 2

(c) 3

(d) 4

Answer:(c) 3

II. Fill in the blanks:

Question 1.

_________ of the total freshwater is frozen as ice caps and glaciers.Answer:68.7%

Question 2.

Agriculture consumes around ______ of the available freshwater.Answer:70 %

Question 3.

March 22 ispbserved as _______.Answer:World Water Day

Question 4.

Contamination of water bodies by human activities is called _______ pollution.Answer:water

Question 5.

_______ mosquitoes also transmit chikungunya and yellow fever.Answer:Aedes

III. Match the following:


IV. Answer briefly:

1. Why is underground water free from suspended Impurities?


  • Underground water is free from suspended impurities because it is filtered by nature, as it passes through several layers of the soil.

2. What are balls of ice?


  • In freezing conditions, water falling from the sky becomes snow or hail. Hailstones are balls of ice.

3. Define – Freshwater.


  • Water which is obtained naturally from ice sheets, ice caps, glaciers, icebergs, ponds, lakes, rivers, streams, and underground are called freshwater.

4. Write the advantages of Wastewater treatment.


  • Waste water treatment ensures that the environment is clean.
  • There is no water pollution.
  • It prevents waterborne diseases.
  • It ensures that there is adequate water for irrigation.

5. What are the major sources of Water pollution?


  • The major sources of water pollution are industrial waste, sewage, domestic waste, chemical fertilizers and insecticides, synthetic detergents, and oil spills.

6. Name the Causative Agents and write the Symptoms for Dengue Fever and Sine Flu.


  • Dengue fever:- Virus (Flavi Virus) – High fever, Severe headache, Muscle and joint pain, Vomiting with blood, and Stomach pain.
  • Swine Flue:- Virus (Influenza) – Infection in respiratory tracks, Indigestion, Nasal secretions.

V. Answer In detail:

1. Write a short note on Farm Ponds.


  • A farm pond is a structure dugout on the Earth. It is usually square or rectangular
  • in shape.
  • Rainwater is stored in it for irrigation purposes. It is surrounded by a small bund, which
  • prevents erosion on the banks of the pond.
  • The size and depth of the pond depending on the type of the soil, water requirements of the
  • farmer, its uses, and the cost of excavation.
  • Water is conveyed to the fields manually, by pumping, or by both.

2. write the names of Causative Agents and the symptoms for waterborne diseases.


Name of the Waterborne Diseases

Causative Agents



Bacteria and Parasites (Salmonella, Shigella and E.coli)

Indigestion, Sweating, Abdominal pain, Vomiting, Stomach cramps




Bacteria (Shigella)


Blood in stool, Indigestion, Vomiting, Dehydration, Fever, Weight loss

Typhoid Fever

Bacteria (Salmonella)

High fever, Headache, Stomach pain, Muscle weakness, Weight loss


Bacteria (Vibrio Cholerae)

Severe diarrhea, Vomiting, Dehydration

Hepatitis -A

Virus (Hepatitis)

Vomiting, Fever, Dark urine, Itching, Yellow skin and eyes, Lack of appetite

Hepatitis – E

Virus (Hepatitis-E)

Vomiting, Fever, Dark urine, Itching, Yellow skin and eyes, Lack of appetite

3. How is Dengue fever spread? What are the symptoms?


Dengue is a viral disease spread by Aedes female mosquitoes that bite during day time.

They breed in stagnant water found in containers and old tyres.


  • Symptoms may include high fever, severe headache, muscle, and joint pain, and a characteristic skin rash.
  • Symptoms of dengue fever typically begin three to fourteen days after infection.
  • Deficiency of platelets in blood.
  • Intense stomach pain.
  • Regular vomiting with blood.

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