Life in the deserts - Class 7 Social Science - Chapter 15 - Notes, NCERT Solutions & Extra Questions
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Back Questions - Life in the deserts | Social Science Success | Social Science | Class 7
Hot deserts are located in :
(a) Mountains
(b) Tropical regions
(c) Temperate regions
(d) Polar Regions
Hot deserts are located in Tropical regions.
The climate of Sahara desert is :
(a) hot and dry
(b) hot and humid
(c) cold and dry
(d) Cold and humid
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Sign up nowTwo main items of export from Ladakh are
(a) Oil and dates
(b) Apricot and pashmina
(c) Flowers and timber
(d) Iron and copper
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Sign up nowTibetan antelope that was hunted and killed for its fine quality wool known as 'shahtoosh':
(a) Ibex
(b) Jerboa
(c) Chiru
(d) Yak
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Sign up nowBuddhist monasteries are also known as :
(a) Gompas
(b) Churches
(c) Chortens
(d) Stupas
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Sign up nowWhich of the following animals is not found in the Sahara?
(a) Hare
(b) Camel
(c) Kyang
(d) Yak
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Sign up nowWhich region is characterised by extremely high or low temperature and has scarce vegetation?
(a) Desert
(b) Fertile land
(c) Grassland
(d) None of these
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Sign up nowHow many countries touch Sahara desert?
(a) Eleven
(b) Thirteen
(c) Sixteen
(d) Twenty
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Sign up nowWhich of these trees is not found in Sahara desert?
(a) Mango
(b) Date palm
(c) Acacia
(d) All of these
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Sign up nowFiII In the blanks
cacti---acacia ----aridity---- tropical ----Tibetan---- oases ----arid plateau
1. The common factor between all deserts of the world is ____________________
2. Hot deserts are located in the ____________________ regions.
3. ____________________ and ____________________ are common vegetation.
4. ____________________ are water holes in the desert.
5. Ladakh is a spectacular ____________________
6. Lakadhi culture has close similarity with ____________________ culture.
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Sign up nowMatch the following
Column A | Column B |
---|---|
1. Largest hot desert in the world | (a) Thiksey |
2. Crescent shaped sand dunes | (b) Drass |
3. Second coldest inhabited place | (c) Sahara |
4. Black necked crane of Ladakh | (d) Thung Thung |
5. Buddhist monastery in Ladakh | (e) Barchans |
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Sign up nowName the following:
1. Only fresh water lake of Sahara ______________
2. Highest point of the Sahara ______________
3. Lowest point of the Sahara ______________
4. Nomadic tribes of Sahara desert ______________
5. Mountain ranges to the north of Ladakh in which second highest peak of the world is located ______________
6. Highest salt water lake between the border of Ladakh and Tibet ______________
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Sign up nowName the largest desert of the world.
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Sign up nowName the highest point of Sahara desert.
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Sign up nowWhich is the lowest point of the Sahara desert?
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Sign up nowName the pass between Srinagar and Leh.
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Sign up nowWhat is known as the 'Valley of Flowers' in Ladakh?
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Sign up nowWhy are the skies cloudless and clear in the Sahara desert?
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Sign up nowMention any two pecularities of Ladakh's climate.
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Sign up nowName the main mountain ranges and main rivers located in Ladakh.
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Sign up nowWhat is an oasis? How is it formed?
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Sign up nowName the important passes of Ladakh.
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Sign up nowWhat are the main economic activities of the people of Ladakh?
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Sign up nowWhat are the main economic activities of the people of Sahara desert? Name the oil producing countries of the Sahara desert?
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Sign up nowWhere is Ladakh? Which geographical factors affect the climate of Ladakh significantly?
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Sign up nowGive a broad comparison between Ladakh and Sahara. (120 words)
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Ask Chatterbot AINotes - Life in the deserts | Class 7 Social Science Success | Social Science
Life in the Deserts: Comprehensive Class 7 Notes
Introduction to Life in the Deserts
Deserts are regions characterised by their arid climate, scanty rainfall, and extreme temperatures. Despite their challenging environment, deserts are home to unique ecosystems and cultures that have adapted to the harsh conditions. This article delves into the fascinating aspects of life in deserts, focusing on major deserts like the Sahara and Ladakh.
What Defines a Desert?
Deserts are identified by their extremely low annual rainfall, typically less than 25 cm. The temperature variations can be significant, both between day and night and across seasons, which restricts plant and animal life.
Types of Deserts
Deserts can be broadly classified into hot deserts and cold deserts based on their temperature ranges.
Hot Deserts:Hot deserts, like the Sahara, are found in tropical regions. They experience scorching temperatures during the day and cooler temperatures at night.
Cold Deserts:Cold deserts, such as Ladakh, are located in high-altitude or rain-shadow areas, where temperatures can plummet below freezing.
Geographical Location and Landscape of the Sahara Desert
The Sahara Desert, the world's largest hot desert, spans across North Africa, covering around 9 million square kilometres. Its landscape includes sand dunes, rocky plateaus, and oases. Notably, features such as barchan dunes and longitudinal dunes known as siefs are common.
Climate of the Sahara Desert
The Sahara's climate is extremely harsh, with summer temperatures reaching up to 55°C and winter temperatures often dropping below freezing. The desert receives negligible rainfall, and the little that falls evaporates quickly due to the sandy soil.
Natural Vegetation of the Sahara Desert
Despite the arid conditions, some plants thrive in the Sahara. Xerophytic plants, such as cacti and acacias, have long roots to tap groundwater and succulent stems to store moisture. Vegetation is primarily found near oases.
Wildlife in the Sahara Desert
The Sahara is home to various animals adapted to its harsh conditions. The camel, often termed the "ship of the desert", is the most iconic. Other inhabitants include the jerboa, Saharan hare, fennec fox, scorpions, snakes, and lizards.
People of the Sahara Desert
Nomadic tribes like the Tuareg and Bedouins have traditionally inhabited the Sahara. They survive by trading, herding livestock, and utilising camels for transportation. Their lifestyle is gradually changing with modernisation.
Modernisation and Economic Activities in the Sahara Desert
Oil and gas discoveries have revolutionised parts of the Sahara, leading to the development of industries and urbanisation. Agricultural activities near oases and trade continue to be significant.
Unique Adaptations of Camels
Camels have physical adaptations such as flaps in their nostrils, double eyelashes, and the ability to store fat in their humps, enabling them to survive desert conditions. They can drink up to 100 litres of water at once and go for days without water.
Cold Desert - Ladakh
Geographical and Climatic Conditions:Ladakh, located in northern India, is a high-altitude cold desert. It experiences extreme temperatures, with summer temperatures ranging between 25°C during the day and 10°C at night, and winter temperatures plunging to -35°C.
Natural Vegetation and Wildlife:Vegetation in Ladakh is sparse, except in stream beds and river valleys. It is known for its wild herbs, shrubs, and alpine grasslands. Wildlife includes the yak, ibex, blue sheep, and various bird species such as the black-necked crane and golden eagle.
graph LR
A[Geographical Aspects of Ladakh] --> B[High Altitude]
A --> C[Rain Shadow Area]
B --> D[Extreme Temperature]
C --> E[limited Rainfall]
People of Ladakh:The hardy and friendly people of Ladakh engage in agriculture during the brief summer months. Traditional practices include the careful irrigation of terraced fields and the rearing of livestock. Ladakhi culture shares similarities with Tibetan culture, with monasteries and festivals playing a vital role.
Importance of Oases:Oases are vital for sustaining life in deserts. They provide water for agriculture and human settlements, enabling trade and offering a respite from the harsh desert environment.
Historical Context
Thousands of years ago, parts of the Sahara were covered in lush vegetation, as evidenced by fossil records and ancient cave paintings. Similarly, Ladakh’s landscape has been shaped over centuries by its climatic conditions.
Changing Desert Landscape
Deserts are experiencing significant changes due to modernisation. Infrastructure developments such as oil and gas plants, solar power projects, and desalination plants are transforming the desert landscape. However, issues like desertification, particularly in regions like the Sahel south of the Sahara, pose ongoing challenges.
Conclusion
Understanding life in deserts reveals how nature and humans adapt to extreme conditions. From the vast expanse of the Sahara to the high altitudes of Ladakh, deserts are dynamic regions with unique ecosystems and cultures.
This article serves as comprehensive notes for students studying the topic in Year 7, elucidating the various aspects of desert ecosystems and human adaptations.
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