Textbook Solutions: Life in The Tropical and Sub-Tropical Regions | Footprints Class 7: Book Solutions, Notes & Worksheets PDF Download

Section I: Multiple Choice Questions

Q1.
 Ans: (a) the Brazilian Highlands
The Brazilian Highlands are located to the south of the Amazon Basin. This region forms a major geographical and ecological barrier in Brazil, separating the Amazon rainforest to the north from the coastal regions to the south.

Q2.
Ans: (a) Andes mountains
The Andes Mountains are the western boundary of the Amazon Basin. These mountains are where the Amazon River begins and play a crucial role in the climatic and ecological characteristics of the region.

Q3.
 Ans: (b) Amazon
The Rio Negro is a significant tributary of the Amazon River. It is one of the largest rivers in the world in terms of water volume and merges with the Amazon in Brazil.

Q4.
 Ans: (b) anaconda
The Amazon rainforest is home to the anaconda, which is the largest snake in the world by mass. This species is well-known for its size and aquatic habits.

Q5.
Ans: (b) rios and paranas
The term "paranas" refers to the ponds and river channels in the Amazon Basin that are formed due to the fluctuating water levels of the Amazon River. These areas are crucial for the region's biodiversity.

Q6.
Ans: (a) the Amazon Basin
Pirarucu and tambaqui are fish species native to the Amazon Basin. They are significant both ecologically and economically within the region.

Q7.
Ans: (a) tropical deciduous trees
Teak, sal, and mahua are tropical deciduous trees commonly found in subtropical regions like the Ganga-Brahmaputra Basin. These trees shed their leaves seasonally.

Q8.
Ans: (c) bamboo
Bamboo is very common in the Brahmaputra Valley and is used extensively for various purposes, including construction and crafts due to its fast growth and versatility.

Q9.
Ans: (a) fish
Rohu, catla, and hilsa are all types of fish found in the river systems of South Asia, particularly in the Ganga-Brahmaputra Basin. These are important both for local diets and for the fishing industry.

Q10.
 Ans: (c) the Ganga Basin
The Ganga Basin has one of the highest population densities in the world. This is due to the fertile land and ample water supply, which support a large agricultural economy and a dense population.

Answer the following in one sentence.

Q1.
Ans: The predominant natural vegetation found in the Amazon Basin is the dense, evergreen, tropical rainforest known as the selva.

Q2.
Ans: People residing in the Amazon region often build stilt houses, which are elevated to protect against frequent floods in the rainy season.

Q3.
Ans: In Tibet, the Brahmaputra is known as the Yarlung Tsangpo.

Q4.
Ans: The Sundarbans National Park is a large biosphere reserve and tiger reserve located in the delta region of the Ganga and Brahmaputra river basins, famous for its mangrove forests and the Royal Bengal Tiger.

Q5.
Ans: People living in the Ganga-Brahmaputra valley face urban development problems such as overcrowding, pollution, inadequate infrastructure, and frequent flooding.

Answer the following questions in brief.

Q1.
Ans: The Amazon Basin experiences a hot and wet equatorial climate with temperatures averaging 25°C to 30°C and annual rainfall exceeding 250 cm, resulting in daily rain showers, particularly in the afternoon.

Q2.
Ans: Trees in the Amazon Basin, such as mahogany, rubber, ebony, and rosewood, hold substantial commercial value for their use in construction and furniture making.

Q3.
Ans: The Amazon River is called the 'King of Waters' due to its immense water volume, extensive drainage basin, and significant impact on the local and global environment.

Q4.
Ans: The positive effects include ample water for agriculture and maintaining biodiversity; negative effects include severe flooding that leads to displacement of people and damage to property.

Q5.
Ans: Industries such as tea plantations, agro-based industries, and various small to medium-scale enterprises have provided widespread employment, supporting economic growth and development in the region.

Answer the following questions in detail.

Q1.
Ans: The Amazon Basin is home to an extensive array of wildlife including numerous species of monkeys, big cats like jaguars, a variety of reptiles including the anaconda, over 2,000 species of fish, and colorful birds, making it one of the most biodiverse regions on Earth.

Q2.
Ans: The people of the Amazon Basin engage in occupations such as hunting, gathering, fishing, shifting cultivation of crops like manioc and cassava, rubber tapping, and small-scale mining.

Q3.
Ans: The Ganga-Brahmaputra plains have been formed over millennia through sediment deposition from the rivers Ganga and Brahmaputra and their tributaries. They extend across several regions in India and parts of Nepal, Bhutan, Bangladesh, Tibet, and China.

Q4.
Ans: Agriculture is vital in the Ganga-Brahmaputra Basin due to the fertile soil, ample water supply, and favorable monsoon climate, which support the cultivation of diverse crops and result in high agricultural productivity.

Q5.
Ans: Urbanisation in the Ganga-Brahmaputra Basin has led to the growth of cities and industries but also brought challenges such as pollution, deforestation, and strain on resources. Adverse effects include habitat destruction, increased pollution levels in air and water, and exacerbated flooding due to poor urban planning.