📚 CHAPTER 1: GEOGRAPHICAL DIVERSITY OF INDIA

Class 7 | Exploring Society: India and Beyond

Notes + Worksheet with Answers

📝 STUDY NOTES

Fact

Detail

Position in world

7th largest country; part of Asia

Subcontinent

India + Pakistan, Bangladesh, Nepal, Bhutan, Sri Lanka, Myanmar

Natural barriers

Himalayas (North), Thar Desert & Arabian Sea (West), Indian Ocean (South), Bay of Bengal (East)

Coastline length

Over 7,500 km

Five regions

Mountain zone, Gangetic Plains, Desert region, Southern Peninsula, Islands

Region

Key Features

🏔️ HIMALAYAS (North)

Mountain barrier, snowy peaks, rivers origin

🌾 GANGETIC PLAINS

Fertile plains, agriculture, dense population

🏜️ THAR DESERT (West)

Hot & dry, sand dunes, Rajasthan, Gujarat

⛰️ ARAVALLI HILLS

Oldest mountains, prevents desert from spreading

🪨 PENINSULAR PLATEAU

Deccan Plateau, minerals, tribal forests

🌊 WEST COAST

Gujarat to Kerala, estuaries, ports

🌊 EAST COAST

Ghats to Bay of Bengal, river deltas

🏝️ ISLANDS

Lakshadweep (Arabian Sea) + Andaman & Nicobar (Bay of Bengal)

🌿 NORTHEAST HILLS

Meghalaya Plateau, heaviest rainfall, living root bridges

“Himalaya” = hima (snow) + ālaya (abode) = Abode of Snow

Length: ~2500 km | Countries: India, Nepal, Bhutan, China, Pakistan, Afghanistan

Peaks >8000 m are called ‘Eight Thousanders’ (e.g., Mt. Everest, Kanchenjunga)

Range

Other Name

Height

Key Feature

Himadri

Greater Himalayas

Highest (>8000m)

Snow-covered year-round; Mt. Everest, Kanchenjunga

Himachal

Lower Himalayas

Moderate

Hill stations: Shimla, Darjeeling, Nainital, Mussoorie

Shivalik

Outer Himalayas

Lowest

Foothills; wildlife; transition to Gangetic Plains

71 million years ago

India was part of Gondwana landmass, near Africa

55 million years ago

India broke away and started moving northward

50 million years ago

India collided with Eurasia, land crumpled up

TODAY

Himalayas formed! India still moves 5 cm/year northward → mountains still growing!

Ladakh: India’s cold desert | Winter temperature: below –30°C

Vast, flat, and highly fertile – nourished by rivers from the Himalayas

Largest proportion of India’s population lives here

River

Origin

Flows Into

States

Ganga

Gangotri Glacier (via Bhagirathi)

Bay of Bengal

Uttarakhand, UP, Bihar, WB

Indus

Tibet (Himalayas)

Arabian Sea

J&K, Ladakh

Brahmaputra

Tibet

Bay of Bengal

Arunachal Pradesh, Assam

Godavari

Western Ghats

Bay of Bengal

Maharashtra, AP

Krishna

Western Ghats

Bay of Bengal

Maharashtra, Karnataka, AP

Kaveri

Western Ghats

Bay of Bengal

Karnataka, Tamil Nadu

Narmada

Amarkantak Plateau

Arabian Sea

MP, Gujarat

Feature

Details

Location

Rajasthan, Gujarat, Punjab, Haryana (mostly Rajasthan)

Sand dunes

Formed by wind; can be up to 150 metres high

Climate

Very hot days, cold nights; very little water

Cultural adaptation

People use sand to clean utensils; reuse water

Water conservation

Taanka / Kund – traditional rainwater collection systems

Famous city

Jaisalmer – the ‘Golden City’; Jaisalmer Fort is a UNESCO Heritage Site

Acts as

Natural barrier against human/animal movement

One of the OLDEST mountain ranges in the world – about 2.5 billion years old!

Peninsula = surrounded by water on THREE sides (Arabian Sea + Indian Ocean + Bay of Bengal)

Plateau = flat-topped landform with steep sides

Feature

West Coast

East Coast

Stretch

Gujarat to Kerala

Ganga delta to Kanyakumari

Adjacent to

Arabian Sea

Bay of Bengal

Rivers

Form estuaries; short & swift

Form river deltas; wide plains

Water bodies

Coves, creeks, estuaries (largest: Narmada & Tapti)

Lagoons: Chilika Lake, Pulicat Lake

Cities

Mumbai, Goa, Kochi

Kolkata, Chennai, Visakhapatnam

Delta: A triangular/fan-shaped landform formed at river mouth when sediments deposit into ocean. Made the land very fertile for farming.

Feature

Lakshadweep

Andaman & Nicobar

Location

Arabian Sea (near Kerala)

Bay of Bengal

Type

36 coral islands (archipelago)

500+ volcanic islands

Significance

Fishing, marine resource exploration

Strategic location – India’s ocean outpost

Special

Not all islands inhabited

Barren Island – only ACTIVE VOLCANO in India; Cellular Jail – historical prison

Wildlife

Coral reefs

Diverse flora & fauna; coral reefs

Region

Key Features

Sundarbans (West Bengal)

Delta of Ganga & Brahmaputra; mangrove forests; Royal Bengal Tiger; UNESCO Heritage Site; shared with Bangladesh

Northeast Hills (Meghalaya)

Garo, Khasi, Jantia Hills (Meghalaya Plateau); one of highest rainfalls in world

Mawlynnong Village

Cleanest village in Asia (East Khasi Hills, Meghalaya); famous for living root bridges made by weaving tree roots

Cherrapunjee

Famous for living root bridges near Nongriat village

Site

Location

Significance

Great Himalayan National Park

Himachal Pradesh

Rich biodiversity; protected by government & village communities

Western Ghats (Sahyadri Hills)

Western coast

Home to many rivers; rich flora and fauna

Jaisalmer Fort

Rajasthan (Thar Desert)

Golden City fort; historical architecture

Sundarbans

West Bengal

Mangrove delta; Royal Bengal Tiger habitat

⚡ QUICK REVISION – KEY POINTS

Remember These!

• India = 7th largest country | 7500 km coastline | 5 main geographical regions

• Himalaya = ‘Abode of Snow’ | 2500 km long | 3 ranges: Himadri, Himachal, Shivalik

• Himalayas formed: India (from Gondwana) collided with Eurasia 50 million years ago

• Himalayas = ‘Water Tower of Asia’ | Gaumukh = origin of Ganga (Bhagirathi River)

• Ladakh = cold desert | −30°C | moonland terrain | Pangong Tso lake

• Aravalli = 2.5 billion years old = OLDEST mountain range | zinc first extracted at Zawar

• Thar Desert = Rajasthan | Sand dunes up to 150m | Jaisalmer = Golden City

• Brahmaputra = son of Brahma | gets bigger in summer (snowmelt from Himalayas)

• Only active volcano in India = Barren Island (Andaman & Nicobar)

• Cleanest village in Asia = Mawlynnong, Meghalaya

📋 WORKSHEET – QUESTIONS & ANSWERS

SECTION A: Questions Asked In Between the Chapter

✏️ Answer:

• Brahmaputra means ‘son of Brahma’ (Brahma = God of creation).

• It gets BIGGER in summer because its source is in the Himalayan glaciers.

• In summer, the hot weather melts snow and glaciers, sending more water into the river..

✏️ Answer:

• The Gangetic Plains are flat and highly fertile, making them ideal for agriculture.

• Rivers provide water throughout the year → great for farming → large populations settled here.

• Better roads, railways, and cities developed in flat land.

• A large proportion of India’s population lives here, so there are more lights visible from space.

✏️ Answer:

• Sand dunes are hill-like formations of sand created by the wind.

• When the wind blows, it picks up sand and deposits it in one place, gradually building a hill shape.

• Wind constantly moves sand so dunes can shift position – unlike mountains which are fixed.

✏️ Answer:

• The colours on a physical map indicate altitude (height above sea level).

• Legend shows: Dark brown/purple = very high (Himalayas), light green = low plains, yellow = desert/medium.

• Colours help us identify mountains, plains, plateaus, and coastal areas at a glance.

✏️ Answer:

• When a river splits into multiple streams near the coast, it forms a DELTA.

• The word for multiple streams is ‘distributaries’.

• Famous deltas: Ganga-Brahmaputra delta (Sundarbans), Godavari delta, Krishna delta.

SECTION B: Exercise Questions (End of Chapter)

✏️ Answer:

Two important geographical features of India:

1. The Himalayas:

   • They are the ‘Water Tower of Asia’ – source of major rivers (Ganga, Indus, Brahmaputra).

   • They protect India from cold Arctic winds and influence the monsoon climate.

   • They serve as a natural barrier and are culturally sacred.

2. The Gangetic Plains:

   • The most fertile land in India, supporting agriculture for millions of people.

   • Home to the largest share of India’s population.

   • Flat land has helped build extensive roads and railway networks.

✏️ Answer:

If the Himalayas did not exist:

• Cold, dry Arctic winds from Central Asia would reach India, making it very cold.

• There would be no major rivers like Ganga, Indus, or Brahmaputra – the Gangetic Plains would be dry.

• The monsoon pattern would change, resulting in less rainfall.

• India’s population and civilisation in the north would be much smaller.

✏️ Answer:

India is called a ‘mini-continent’ because:

• It has every type of landform: mountains, plains, deserts, plateaus, coastlines, and islands.

• It has extreme climates from ice-cold Ladakh (−30°C) to hot Thar Desert.

• It has diverse wildlife, plants, and cultures.

• It forms a distinct subcontinent separated from Asia by the Himalayas.

✏️ Answer:

Let us trace the Ganga River:

• Gaumukh (Uttarakhand) → Ganga originates from Gangotri Glacier as the Bhagirathi River.

• Rishikesh/Haridwar → considered sacred; used for pilgrimage, bathing, rituals.

• Allahabad (Prayagraj) → confluence (Sangam) of Ganga, Yamuna, and Saraswati.

• Kanpur, Varanasi → used for irrigation, industries, transportation, fishing.

• Patna → used for farming, drinking water, navigation.

• Sundarbans (West Bengal) → forms delta with Brahmaputra; used for fishing, mangrove resources.

• Bay of Bengal → merges with the ocean.

Uses along the way: drinking water, irrigation, industry, transport, hydroelectricity, tourism, religion.

✏️ Answer:

It is called a ‘peninsular plateau’ because of TWO reasons:

1. PENINSULA: The southern region is surrounded by water on three sides:

   – Arabian Sea (west), Indian Ocean (south), Bay of Bengal (east).

   This makes it a peninsula.

2. PLATEAU: The land here is a raised, flat landform (the Deccan Plateau),

   with steep sides (Western and Eastern Ghats on its borders).

   This makes it a plateau.

So: Peninsula + Plateau = Peninsular Plateau.

✏️ Answer:

The Sundarbans is the most fascinating UNESCO World Heritage Site.

• It is where the Ganga and Brahmaputra rivers meet the sea, forming the world’s largest mangrove forest.

• It is home to the Royal Bengal Tiger.

• It has a unique blend of river, land, and sea – making it a very special ecosystem.

• It is shared between India (West Bengal) and Bangladesh.

• The mangrove trees help protect the coast from storms and cyclones.

(Students may write about any site – Himayan National Park / Western Ghats are also great choices!)

✏️ Answer:

This answer depends on where you live. Examples:

• If in Jorhat, Assam → Located in the Brahmaputra River Valley (eastern Gangetic Plains / Northeast).

   – Near the hills of the Northeast (Meghalaya Plateau region).

   – Surrounded by river plains of the Brahmaputra.

• Students should identify nearby mountains, rivers, plains or plateaus using the physical map.

✏️ Answer:

Geographical diversity leads to different food preservation methods:

• Himalayas (cold climate): Drying vegetables and fruits in the sun; making chutneys and pickles.

• Thar Desert (hot, dry): Sun-drying vegetables, making dried lentil balls (papad), using salt to preserve.

• Gangetic Plains: Fermenting foods like pickles (achaar), drying grains.

• Coastal regions: Drying fish in the sun (dried fish); making fermented fish pastes.

• Northeast: Fermenting bamboo shoots; sun-drying chillies and greens.

Common method everywhere: Drying seasonal vegetables for use in off-season.

✏️ Answer:

Geography has united India in several ways:

• The Himalayas in the north act as a common wall that ALL Indians share and feel protected by.

• Rivers like the Ganga are considered sacred and are worshipped across the country, creating cultural unity.

• Trade and travel along rivers, coastal routes, and plains has connected people for thousands of years.

• Diverse geography means different regions produce different goods → they depend on EACH OTHER for trade.

• Common threats (like floods, droughts) bring people together to help each other.

• The ocean surrounds the peninsula, making India feel like a single ‘island’ geographically.

Diversity in geography = diversity in resources = need for connection and cooperation = unity!

SECTION C: Fill in the Blanks

Fill in the blanks with the correct word:

1. India is the _____________ largest country in the world. (Answer: seventh)

2. The word ‘Himalaya’ means ________________. (Answer: Abode of Snow)

3. The Brahmaputra River means ________________. (Answer: Son of Brahma)

4. Ladakh is known as a _____________ desert. (Answer: cold)

5. The only active volcano in India is located on _____________ Island. (Answer: Barren)

6. _____________ is called the ‘Water Tower of Asia’. (Answer: Himalayas)

7. The _____________ are the oldest mountains in the world, about 2.5 billion years old. (Answer: Aravallis)

8. Jaisalmer is known as the ‘_____________ City’. (Answer: Golden)

9. The Sundarbans is home to the _____________. (Answer: Royal Bengal Tiger)

10. The cleanest village in Asia is _____________ in Meghalaya. (Answer: Mawlynnong)

SECTION D: Match the Following

Column A

Column B (Answer)

Gaumukh

Origin of Ganga River

Pangong Tso

Saltwater lake in Ladakh

Kath-kuni

Traditional house style in western Himalayas

Taanka / Kund

Rainwater collection system in Rajasthan

Cellular Jail

Historic prison in Andaman Islands

Zawar

Ancient zinc mines in Aravallis

Sundarbans

Mangrove delta in West Bengal

Deccan Plateau

Lies between Western and Eastern Ghats

SECTION E: True or False

1. The Himalayas stretch across 6 countries in Asia.  → TRUE

2. The Thar Desert is a cold desert.  → FALSE – It is a hot desert. (Ladakh is the cold desert.)

3. Lakshadweep is located in the Bay of Bengal.  → FALSE – It is in the Arabian Sea.

4. The Aravallis prevent the Thar Desert from spreading eastward.  → TRUE

5. Brahmaputra gets smaller in summer.  → FALSE – It gets bigger due to glacial melt.

6. Western Ghats are also called the Sahyadri Hills in the north.  → TRUE

7. Barren Island has India’s only active volcano.  → TRUE

8. Jog Falls is located in Rajasthan.  → FALSE – It is in Karnataka.

📖 GLOSSARY – KEY TERMS

Term

Meaning

Subcontinent

A large landmass that is part of a continent but distinct from it

Glacier

A large, slow-moving mass of ice

Tributary

A smaller river that joins a bigger river

Peninsula

Land surrounded by water on three sides

Plateau

A flat-topped landform raised above surrounding land, often with steep sides

Delta

Fan-shaped landform at a river mouth formed by deposited sediments

Estuary

Wide river mouth where fresh water meets sea water

Archipelago

A group of islands

Lagoon

A body of water separated from the sea by a natural barrier

Taanka/Kund

Traditional rainwater harvesting structures in Rajasthan

Kath-kuni

Traditional stone and wood house construction in western Himalayas

Eight Thousanders

Himalayan peaks over 8000 metres in height

Hydroelectricity

Electricity generated using water power (hydro = water)

Gondwana

Ancient supercontinent from which India broke away ~71 million years ago

✨ Remember: India’s geographical diversity is its greatest strength! ✨

Mountains, deserts, plains, plateaus, coasts & islands – India has it all!