CBSE Class 7 Social Science: Human Environment Interactions – Tropical and Subtropical Regions NCERT Solutions

1. The Amazon Basin is located in the continent of South America.
2. The people of the Amazon Basin grow staple crops such as tapioca, pineapple, and sweet potato. They also cultivate cash crops like coffee, maize, and cocoa.
3. In the rain forests of the Amazon, you are likely to find a variety of birds, including toucans, parrots, and hummingbirds, among many others.
4. Major cities located on the river Ganga include Allahabad, Kanpur, Varanasi, Lucknow, Patna, and Kolkata.
5. The one-horned rhinoceros is primarily found in the Brahmaputra plain, particularly in regions like Kaziranga National Park.

1. (i) birds. Toucans are a distinctive type of bird known for their large, colourful beaks, found in tropical rainforests.
2. (iii) Amazon. Manioc, also known as tapioca, is a staple food for the people living in the Amazon Basin.
3. (ii) Hooghly. Kolkata is situated on the banks of the Hooghly River, a distributary of the Ganga.
4. (i) Coniferous trees. Deodars and firs are types of coniferous trees, commonly found in mountainous regions with colder climates.
5. (ii) Delta area. The Bengal tiger is famously found in the mangrove forests of the Ganga-Brahmaputra Delta, also known as the Sundarbans.

1. Cotton textile - (f) Varanasi. Varanasi is known for its textile industry, including cotton weaving.
2. Maloca - (d) Slanting roof. Malocas are traditional communal houses of indigenous people in the Amazon, often characterized by slanting roofs.
3. Piranha - (g) Fish. Piranhas are well-known predatory fish found in the rivers of South America, including the Amazon.
4. Silk worm - (c) Sericulture. Sericulture is the practice of raising silkworms for the production of silk.
5. Kaziranga - (a) Assam. Kaziranga National Park, famous for the one-horned rhinoceros, is located in Assam.

1. The rainforests are depleting rapidly due to ongoing developmental activities that are progressing at a fast pace. These activities lead to the destruction of the biologically diverse rainforests. It is estimated that a significant area of rainforest disappears annually, particularly in the Amazon basin. This deforestation results in the topsoil being washed away by rains, transforming the lush green forests into barren landscapes.
2. The cultivation of paddy (rice) requires a substantial amount of water. The Ganga-Brahmaputra plains are well-suited for paddy cultivation because they receive high rainfall, which provides the necessary water for the crops to grow effectively.

This question requires drawing on maps. Students should refer to geographical maps to accurately depict the rivers Ganga and Brahmaputra, their tributaries, and the countries in South America that the equator passes through.

For the Indian Sub-continent map:

Draw the Ganga river originating from the Himalayas, flowing eastwards through northern India and Bangladesh, and finally merging into the Bay of Bengal. Similarly, draw the Brahmaputra river originating in Tibet, flowing through northeastern India and Bangladesh, and joining the Ganga. Mark major tributaries like Yamuna, Ghaghara, Gandak, Kosi for the Ganga, and Dibang, Lohit, Teesta for the Brahmaputra.

For the South America map:

Draw the Equator line (0° latitude) across the continent. Identify and mark the countries that the Equator passes through, which are Ecuador, Colombia, and Brazil.