Human Environment Interactions: The Tropical and the Subtropical Region Class 7 Extra Questions Social Science Geography Chapter 8
NCERT Extra Questions for Class 7 Social Science Geography Chapter 8 Human Environment Interactions: The Tropical and the Subtropical Region
Why is Renuka excited?
Renuka is excited as her wildlife photographer uncle was coming back home. He had introduced her to the books having pictures of distant lands and life of people there.
What are the similarities or differences between the people of different countries?
People of deserts, frozen land or hot wet forests only look different, they have same basic needs of food clothing and shelter. The children are all alike,they play same games, sing, dance, fight or make up.
The main difference is that some of them live close to nature and have learnt to use and protect nature.
Life in the Amazon Basin
Describe the situation and location of the Amazon Basin.
Situation and Location of the Amazon Basin:
- Look at the world map (on page 56 of the textbook), the Amazon Basin lies very close to the equator, between 10°N to 10°S.
- This region is known as the equatorial region.
- The river Amazon flows through this region.
It flows1 from the mountains in the west and reaches the Atlantic Ocean in the east.
- Numerous tributaries join in the Amazon river and they together form the Amazon Basin.
- The river basin drains portions of Brazil, parts of Peru, Bolivia, Ecuador, Columbia and a small part of Venezuela.
Name the countries of the basin through which the equator passes.
The countries of the basin through which the equator passes are
- Dem.Rep of Congo
What is river’s mouth?
The place where a river flows into another body of water is called the river’s mouth.
Define the tributary.
The small rivers that join the main river are called its tributaries, for example Son, Yamuna are tributaries of Ganga.
Give an account of the climate of Amazon Basin.
Climate of Amazon Basin:
- Amazon basin stretches directly on the Equator.
- It has hot and wet climate throughout the year.
- Both day and nights are almost equally hot and humid.
- Skin feels sticky.
- It rains almost every day.
- It rains without much warning.
- The day temperatures are high with high humidity.
- At night the temperature goes down but humidity is high.
Give an account of rain forests and wild life of Amazon Basin.
Rainforests of Amazon Basin:
- In Amazon basin, it rains heavily.
- Thick forests grow here.
They are in fact so thick and dense that “roof* created by leaves and branches do not allow the sunlight to reach the ground.
- The ground remains dark and damp.
- Only shade tolerant vegetation grows here.
- Orchids, bromeliads grow as plant parasites.
Wild Life of Amazon Basin
- The rainforests are rich in fauna.
- Birds like toucans, humming birds, birds of paradise with their brilliantly coloured plumage, oversized bills for eating make them different from birds found in India.
- These birds also make loud sound in the forests.
- Animals like monkeys, sloth and ant-eating tapirs are found here.
- Various species of reptiles and snakes are also found in these jungles.
- Crocodiles, snakes, pythons abound.
- Anaconda and Boa constrictor are some of the species.
- Amazon basin is also the home of thousands of species of insects.
- Several species of fish like the flesh-eating Piranha fish is also found in the river.
- Amazon basin is actually extraordinarily rich in the variety of life found there.
People of the rainforests
Describe the life of people of the Rainforests of Amazon”Basin.
Life of the People of the Rainforests of Amazon Basin:
People grow most of their food in small areas after clearing some trees in the forest.
- Men hunt and catch fish along the rivers.
- Women take care of the crops.
- They mainly grow tapioca, pineapple, and sweet potato.
- Hunting and fishing being uncertain, it is the women who keep their families alive by feeding them the vegetables they grow.
- They practise “slash and bum agriculture”.
- The staple food is manioc. It is also known as cassava. It grows under the ground like the potato.
- The people also eat queen ants and egg sacs.
- Cash crops like coffee, maize and cocoa are also grown in the Amazon Basin.
The rainforests provide a lot of wood for the houses.
- Some families live in thatched houses. They are shaped like beehives.
- There are other large apartment-like houses called “Maloca”. They have steeply slanting roofs to allow rain water flowing down easily.
What changes have occurred with life of the people of Amazon Basin in recent times?
Life of the people of the Amazon basin is slowly changing.
In the early days, to reach the heart of the forest, river was the only means of transport.
- In modem times means of transport have developed considerably. In 1970 the Trans Amazon highway made all parts of the rainforest accessible.
- Aircrafts and helicopters are also used for reaching various places.
- The aborigines (indigenous) population was pushed out.
- Diverse rain forests are being destroyed with long term consequences.
What is the affect of Developmental activities in the Amazon basin?
The developmental activities are leading to the gradual destruction of the biologically diverse rainforests. Annually a large area is disappearing. The top soil is being washed away and the land is becoming barren.
Give an account of Slash and Burn Agriculture.
Slash and Bum Agriculture:
- It is a way of cultivating land where farmers clear a piece of land by slashing or cutting down trees and bushes.
- These are then burnt, which release the nutrients into soil.
- New crops are grown in this cleared field for a few years.
After repeatedly using the patch of land, the soil loses its nutrients.
- So it is abandoned.
- Then they clear another plot of land to plant.
In the meantime young trees grow in the old field.
- In this way soil fertility is restarted (restored).
- People then return to it.
- They start cultivating again by repeating the process.
Life in the Ganga-Brahmaputra Basin
Explain the physiography of the Ganga-Brahmaputra Basin.
Physiography of the Ganga-Brahmaputra Basin:
The tributaries of river Ganga and Brahmaputra together form the Ganga- Brahmaputra basin in the Indian subcontinent.
- It lies in the sub-tropical region.
- It is located between 10°N and 30°N latitudes.
The tributaries of the River Ganga like the Ghagra, the Son, the Chambal, the Gandak, the Kosi and the tributaries of Brahmaputra drain it.
- Some of the tributaries of the river Brahmaputra are:
- Dihang, Dibang. Lohit and Dhansiri.
The main physiographical features of the Ganga-Brahmaputra Basin are:
- Mountains and foothills of the Himalayas
- Sundarbans delta
- Ox-bow lakes dot the plain area.
River Brahmaputra is known. by different names in different places. It is called Tsangpo in Tibet. Find the other names of the river.
Dehang, Dahang, Jarnuna, Meghna, Padma etc.
What is the climate of Ganga-Brahmaputra Basin?
- The Ganga-Brahamputra Basin is dominated by monsoon climate.
- The monsoon brings rains from mid-June to mid-September.
- The summers are hot.
- The winters are cool and generally dry.
Look at the Map of’ India. List the states in which the Ganga-Brahmaputra Basin lies.
- Uttar Pradesh
- Northern Madhya Pradesh
- Northern Chhattisgarh
- Arunachal Pradesh
How does environment play a dominant role in the distribution of population in the Ganga-Brahmaputra basin?
- Ganga-Brahmaputra basin has varied topography.
- The environment plays a dominant role in the distribution of the population here.
- The mountain areas with steep slopes have inhospitable terrain.
Hence less number of people live in the mountain area of the Ganga-Brahmaputra basin.
- The plain area provides the most suitable land for human habitation.
- The soil is fertile.
- Agriculture is the main occupation of the people.
- The density of population is very high.
- Since cultivation of paddy requires sufficient water, it is grown in the areas where the amount of rainfall is high or enough water is available.
Give an account of agriculture in the Ganga-Brahmaputra Basin.
Agriculture in Ganga-Brahmaputra Basin:
- Wheat, Maize, Sorghum, Gram and Millets are major crops that are grown as food crops.
- Cash crops like sugarcane and jute are grown in large quantities.
- Banana plantation are seen in some areas of the plain.
- In West-Bengal and Assam tea is grown in plantations.
- Silk is produced through the cultivation of silk worms in parts of Bihar and Assam.
- In the mountains and hills, crops are grown on terraces made on gentle slope.
Explain the forest wealth of Ganga-Brahmaputra Basin.
- The vegetation cover is according to the type of landforms.
- Delta region is covered with mangrove forests.
- In this basin tropical deciduous trees grow along with teak, sal, peepal.
- Thick bamboo groves are in Brahmaputra plains.
- In parts of Uttarakhand, Sikkim and Arunachal Pradesh and other small states of the North-east coniferous trees like pine, deodar, and fir are seen.
Write about the fauna of Ganga-Brahmaputra basin.
A wide variety of wild life is found here:
- Elephants, tigers, deer and monkeys are common.
- One homed rhinoceros, Bengal tiger, crocodiles and alligators are found.
- Large aquatic life is found in fresh waters like rohu, catla, hilsa.
Why are terraces built on the mountain slopes?
Terraces are built on the gentle (mountain) slopes to create flat surfaces on which crops are grown. The slope is removed so that water does not ran off rapidly.
Where is blind variety of dolphin found?
In the fresh water of River Ganga and River Brahmaputra, blind variety of dolphin, locally called Susu, is found.
Why is blind dolphin facing extinction?
The blind dolphin or Susu is facing extinction at the hand of humans.
- The Dolphin eats small fish only. The presence of Susu is an indication of the health of the river.
- The untreated industrial and urban wastes with high amounts of chemical are killing this species.
Which towns and cities are located in the Ganga-Brahmaputra Basin?
- The Ganga-Brahmaputra Plain has several big towns and cities.
- The cities of Allahabad, Kanpur, Varanasi, Lucknow, Patna all with a population of more than ten lakhs are located along the River Ganga.
- The waste water from these towns and industries is discharged into the river leading to its pollution.
Write a note on the transportation found in the Ganga-Brahmaputra Basin.
- All the four means of transport are well-developed in Ganga-Brahmaputra basin.
- In the plain areas the roadways and railways transport the people from one place to another.
- The waterways, is an effective means of transport particularly along the rivers. Kolkata is an important port on the river Hooghly.
- The plain areas have a large number of airports.
tourism is an important activity of the Ganga-Brahmaputra basin.
Tourism is an important activity of the basin.
The following make the basin important from the point of tourism.
- Taj Mahal on the banks of River Yamuna in Agra.
- Allahabad on the confluence of the River Ganga, Saraswati and Yamuna.
- Buddhist centres in Uttar Pradesh and Bihar. ,
- Lucknow with its Imambara.
- Assam with Kaziranga and Manas wild life sanctuaries.
- Arunachal Pradesh with a distinct tribal culture.
There are so many other places to visit.
Objective Type Questions
Fill in the blanks with appropriate words:
1. Women of warrior tribe in Roman empire were called …………….
2. Small rivers that join a main river are called ……………………
3. Large houses called …………………… have steep slanting roof.
4. West Bengal and Assam are known for …………………….. plantations.
5. People in ………………………… eat queen ants and their eggs.
5. Amazon basin.
State whether the given statements are true or false.
1. Spanish explorers discovered the Amazon river.
2. It rains only for two months in the Amazon basin.
3. The flesh eating piranha fish is found in Amazon river.
4. In the Ganga-Brahmaputra delta area, Bengal tiger, crocodiles and alligators are
5. Agra is on the confluence of river Ganga and Yamuna.
Match the contents of Column A with that of Column B:
Multiple Choice Questions
Question 1 What ari the common needs of all the people?
(d) All of these
Life in the Amazon Basin
The place where a river flows into another water body is called
(a) river’s mouth
(b) river’s nose
(c) river’s leg
(d) all of these
How is the climate of Amazon basin characterized?
(a) By cold and wet
(b) By hot and wet
(c) By dry or wet
(d) None of these
By dry or wet
At night the temperature goes down in the Amazon basin but the humidity
(a) remains same
(b) remains low
(c) remains high
(d) none of these
The forests are in fact so thick that the dense ‘roof is created by
Toucans are the type of
People of the Rainforests
Manioc food belongs to the area of
(a) South America
(b) South Africa
(c) Amazon area
(d) Ganga basin
Life in the Ganga-Brahmaputra Basin
Where is one horned rhinoceros found?
(a) Brahmaputra plain
(b) Amazon basin
(c) Ghaghra plain
(d) None of these
What is the main occupation of the people living in Ganga-Brahmaputra basin?
Where is Bengal Tiger found?
(a) Mountain area
(b) Amazon basin
(c) Sundarbans delta
(d) All of these
On which river bank are Allahabad, Kanpur, Varanasi, located?
(a) River Ganga
(b) River Brahmaputra
(c) River Hooghly
(d) River Yamuna