Text Book Back Questions and Answers - Chapter 2 Water Term 2 5th Science Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated On May 15, 2024

By SaraNextGen

Chapter 2 - Water - Term 2 - 5th Science Guide Samacheer Kalvi Solutions

Text Book Back Questions and Answers
Evaluation
I. Choose the correct answers:
Question $1 .$
Which of the following microorganisms causes waterborne diseases?
a) Bacteria
b) Virus
c) Protozoa
d) All
Answer:
(d) All

Question $2 .$
Water is present in huge quantities as vapor and clouds in the
a) sky
b) earth
c) atmosphere
d) rain
Answer:
(c) Atmosphere

Question $3 .$

________water is free from suspended impurities.
a) Sea

b) Well
c) River
d) Underground
Answer:
(d) Underground

Question $4 .$

________of water is in oceans and seas.
a) $97 \%$
b) $87 \%$
c) $47 \%$
d) $77 \%$
Answer:
(a) $97 \%$

Question $5 .$
________is an artificial process of converting seawater into freshwater.
a) Distillation
b) Decantation
c) Reverse Osmosis
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:

Answer:

IV. Answer briefly:
Question 1.
Write down the sources of water. Answer:
- River water and lake water
- Seawater
- Well water
- Springwater
- Underground water

Question $2 .$
What is desalination?
Answer:
Desalination is an artificial process of converting saline water (seawater) into freshwater.

Question $3 .$
What are the processes involved in the water cycle?
Answer:
Water cycle consists of the following four processes:
- Evaporation
- Condensation
- Precipitation
- Flowing back to oceans.

Question $4 .$
What are reservoirs?
Answer:
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.

Question $5 .$
How can we prevent dengue fever?
Answer:
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:
Question $1 .$
Write the advantages of rainwater harvesting.
Answer:
Advantages:
- 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.

Question $2 .$
How can we prevent waterborne diseases?
Answer:
- 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.

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:

Answer:

IV. Answer briefly:
Question 1.
Why is underground water free from suspended Impurities?
Answer:
Underground water is free from suspended impurities because it is filtered by nature, as it passes through several layers of the soil.

Question $2 .$
What are balls of ice?
Answer:
In freezing conditions, water falling from the sky becomes snow or hail. Hailstones are balls of ice.

Question $3 .$
Define - Freshwater.
Answer:
Water which is obtained naturally from ice sheets, ice caps, glaciers, icebergs, ponds, lakes, rivers, streams, and underground are called freshwater.

Question $4 .$
Write the advantages of Wastewater treatment.
Answer:
- 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.

Question 5 .
What are the major sources of Water pollution?
Answer:
The major sources of water pollution are industrial waste, sewage, domestic waste, chemical fertilizers and insecticides, synthetic detergents, and oil spills.
 

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

Answer:
- 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:
Question 1.
Write a short note on Farm Ponds.
Answer:
- 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.

Question $2 .$
write the names of Causative Agents and the symptoms for waterborne diseases.
Answer:

Question $3 .$
How is Dengue fever spread? What are the symptoms?
Answer:
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:
- 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.