DAV Class 5 Science Solution Chapter 7 Importance of Water
DAV School Books Class 5 Science Solution Chapter 7 Importance of Water all Question Answer. DAV Class 5 7th Chapter Importance of Water full Chapter explanation by expert teacher.
A.) Fill in the blanks.
Answer: (1) digestion (2) aquatic animals (3) amphibious animals (4) ground water (5) lotus, hydrilla.
B.) Write True or False for the following statements.
1.) Water is required for germination of seeds.
2.) Ground water can be drawn up by a hand pump.
3.) About 50% of water is present in seas and oceans.
4.) Octopus is an amphibious animal.
5.) River water is purified for drinking purpose.
Answer: (1) True (2) True (3) False , About 71 % of water is present in seas and oceans. (4) False, Octopus is a Mollusc. (5) True.
C.) Tick the correct option.
1.) About 97% of water is present in-
Answer: seas and oceans
2.) Plants absorb water from the soil with the help of-
Answer: roots
3.) A rehat is used for-
Answer: drawing out ground water for irrigation.
4.) An example of an amphibious animal is-
Answer: frog
D.) Answer the following questions in brief.
1.) Name any two water bodies that exist on the surface of earth.
Answer: Rivers and Ponds
2.) What are animals living in water known as? Write names of two such animals.
Answer: Animals that inhabit water are known as aquatic animals. Examples of such animal are fishes, sea horses, etc.
3.) What are amphibious animals?
Answer: The animals who can inhabit both water and land are called amphibians . Frog is an amphibian.
4.) Write names of four aquatic plants.
- Four aquatic plants are duckweed, hydrilla, water lettuce, lotus.
5.) How do plants absorb water from the soil?
Answer: Plants use their long roots to absorb water from soil
6) State two common methods of drawing out ground water.
Methods such as using tubewells to pump out groundwater and stepwells are methods of drawing out ground water.
E.) Answers the following questions.
1.) Besides its domestic use, state three other uses of water.
Water can be used for the following purposes-
- Plants require water to transport important minerals within them.
- It is home to many animals.
- Human being require water for drinking.
2.) How does water help in excretion of waste material from animal bodies?
Answer: The water washes away toxic wastes from the body and excretes it in the form of urine.
3.) List any four ways in which water is important for plants.
Answer:
- Helps in transportation of minerals and nutrients.
- Required during the process of photosynthesis to prepare the food for plants.
- It happens to be a habitat for many aquatic animals.
- Dissolved nutrients in water are absorbed by plants.
4.) How can ground water be drawn out through tubewells?
The tubewell consists of a long pipe-like structure that goes all the way down beyond the groundwater level. The hand pump or electric pump of the tubewell is used to make this water flow through the pipe.
5.) What is a stepwell?
It is a well that has steps on its wall so that people could climb down them to fetch water
6.) How is water supplied in cities?
The water supply system utilises the river water and purifies it and then supplies it to homes for daily use.