NCERT Solutions for Class 7 Social Chapter 5 - Water

1. Answer the following questions

(i) What is precipitation?

Ans: The deposition of moisture from the atmosphere onto the earth's surface is known as precipitation. Rain, hail, frost, fog, sleet, or snow are all examples of this.

(ii) What is the water cycle?

 Ans: The water cycle is the process through which water continually changes its form and flows between seas, atmosphere, and land.

(iii) What are the factors affecting the height of the waves?

Ans: High wind speed, wind duration, wind distance on the sea, and earthquakes are all variables that influence the height of waves.

(iv) Which factors affect the movement of ocean water?

Ans: Temperature, Earth's rotation, the gravitational attraction of the sun and moon, earthquakes, and volcanic eruptions are all variables that influence ocean water flow.

(v) What are tides and how are they caused?

Ans: The rhythmic rise and fall of ocean water twice a day are called tide. The gravitational attraction of the sun and moon on the earth's surface causes tidal movements.

(vi) What are ocean currents?

Ans: Ocean currents are streams of water flowing constantly on the surface of the ocean in definite directions. The ocean currents may be warm or cold. For example, the

Labrador ocean current is a  cold current and the Gulf Stream is a warm current.

2. Give reasons

(i) Ocean water is salty.

Ans: Ocean water is salty as it contains large amounts of undissolved salts.

(ii) The quality of water is deteriorating.

Ans: The unnecessary items which we dump in rivers are causing water quality to deteriorate.

Chemicals and industrially contaminated water.

The hazardous insecticides and herbicides that come in from the fields are still present. Unburned or half-burned bodies of men and animals are dumped into bodies of water.

3. Tick the correct answer:

(i) The process by which water continually changes its form and circulates

between oceans, atmosphere, and land.

(a) Water cycle 

(b) Tides

(c) Ocean currents

Ans: (a) Water cycle is the process by which water continually changes its form and circulates between oceans, atmosphere, and land.

(ii) Generally the warm ocean currents originate near

(a) Poles

(b) Equator 

(c) None of these

Ans: (b) the Equator is the place where warm ocean currents originate

(iii) The rhythmic rise and fall of ocean water twice a day is called

(a) Tide

(b) Ocean currents 

(c) Wave

Ans: (a) Tide is the rhythmic rise and fall of ocean water 

4. Match the following:

Ans:        

5. For fun.

Be a detective

(i) The name of one river is hidden in each of the sentences below. Spot it.

Example: Mandra, Vijayalakshmi, and Surinder are my best friends.

Ans: Ravi

(a) The snake charmer’s bustee, stables where horses are housed, and piles of

wood, all caught five accidentally.

(Hint: Another name for river Brahmaputra)

Ans: Teesta.

(b) The conference manager put the pad, material for reading, and a pencil for each

participant:

(Hint: A distributary on the Ganga-Brahmaputra delta?)

Ans: Padma

(c) Either jealousy or anger cause a person’s fall.

(Hint: Name of juicy fruit!)

Ans: Orange

(d) Bhavani germinated the seeds in a pot.

(Hint: Look for her in West Africa)

Ans: Niger

(e) ‘‘I am a zonal champion now,” declared the excited athlete.

(Hint: The river that has the biggest basin in the world)

Ans: Amazon

(f) The tiffin box rolled down and all the food fell in dusty potholes.

(Hint: Rises in India and journeys through Pakistan)

Ans: Indus

(g) Malini leaned against the pole when she felt that she was going to faint.

(Hint: Her delta in Egypt is famous)

Ans: Nile

(h) Samantha mesmerized everybody with her magic tricks.

(Hint: London is situated on her estuary)

Ans: Thames

(i) “In this neighborhood, please don’t yell! Owners of these houses like to have

peace.” warned my father when we moved into our new flat.

(Hint: color!)

Ans: Yellow

(j) Write the following words. Marc! “On,” “go,’’, “in”.... said the teacher to

the little boy in KG Class.

(Hint: Rhymes with ‘bongo’)

Ans: Congo

NCERT Solutions for Class 7 Social Science (Geography) Chapter 5

CBSE Class 7 Social Science Chapter 5 Our environment notes and lessons are available through the PDF files from Vedantu. Visit the site and download Our Environment Class 7 PDF, instantly. NCERT Class 7 Social Science Chapter 5 available at the site will help students to score more in their exams.

NCERT Solutions for Class 7 Social Science Chapter 5 – Our Environment

5.1  Environment

Nature, place, people, things, etc. that surrounds the living species comprises the environment comprises nature, place, people, things that surround the living organism. The environment can be classified into the natural and human environment. It is an amalgamation of both natural as well as human-made phenomena.

The natural environment includes the biotic (living) and abiotic-conditions (non- living), whereas the human-made phenomena comprise the activities and interactions taken by human beings (roads, bridges, etc.).

Natural Environment

• The natural environment contains land, water, air, plants and animals.

• The four domains of the natural environment are the lithosphere, atmosphere, hydrosphere and biosphere.

• The outermost layer or the solid crust or of the earth where we live in the lithosphere. It includes landforms like mountains, plateaus, plains and valleys.

• The domain of water is the hydrosphere.  It includes water bodies like rivers, lakes, seas, oceans, etc.

• The thin layer of air which protects us from the harmful rays is called the atmosphere. 

• The zone where water, land and air interact with each other to support life is a biosphere.

Ecosystem

• The ecosystem comprises the interaction among the living organisms as well as the interaction between the surrounding and the organisms. 

• There could be an ecosystem of large rainforest, grassland, desert, mountains, lake, river, ocean and even a small pond.

Human Environment

• Human beings interact with the environment continuously and alter it according to their needs.

• Early humans used to adapt themselves to nature. 

• With time, humans learnt to grow new things. 

• They started domesticating animals and have a settled life.

• The industrial revolution, information revolution, improved transportation made communication easier, which made human life easy. 

• Man has started overpowering the environment through his activities like deforestation, industrialization, etc.

• The environment gives us the air which we breathe, the water which we drink, the food which we eat and the place where we live. Thus, the environment is the most significant aspect of our lives.

• The natural environment comprises land, plants, water, air, and animals. 

• The natural environment has both biotic and abiotic conditions existing on the earth.

• The biotic defines the world of living organisms, such as animals and plants, abiotic defines the world of non-living such as land, water etc.

• The human environment includes the activities, creations and interactions among human beings for their needs.

• Domains of environment—Lithosphere, hydrosphere, atmosphere and biosphere.

5.2 Human Environment

Download NCERT solutions for Class 7 Social Science Chapter 5 to know more about how the environment is interacting with humans. Basically, to make it simpler for Class 7th Social Science chapter 7, the environment is composed of Natural and Man-made (Human). The natural consist of natural resources, and the human-made consist of human activities. Exercise 5.2 total Solutions contains 5 questions (2 short questions and 3 Long questions).