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GeographyClass 7All

Why do we feel uncomfortable on a humid day?

We feel uncomfortable on humid day because air is already full of water vapour, so its capacity to hold more moisture is not there. As a result, our body sweat does not evaporate making us uneasy.

GeographyClass 7All

Name instrument used to measure the wind speed and to know the direction of wind.

Ans. The wind direction is identified using wind vane and the speed of the wind is measured by wind vane.

GeographyClass 7All

What are clouds?

Ans. When the water vapour rises, it starts cooling. As a result, the water vapour condenses causing formation of droplets of water. These droplets get together and form clouds.

GeographyClass 7All

Write a note on super cyclone?

Ans. The super cyclone hit the state of Orissa on 28th Oct 1999. During the super cyclone, wind speed reached upto 300km/hr. These winds pushed high wall of water onto the shore, flooding large area along the coast. The homes of the poor fisherman were easily destroyed. More than 10,000 people and large number of animals were killed. Millions were left homeless. There was damage to standing crops also.

GeographyClass 7All

Why do astronauts wear special protective space suits?

Ans. Astronauts have to wear special suits as there is no air; hence, no air pressure on the moon. So they have to wear special suits filled with air because if they do not wear them, the counter pressure exerted by the body of the astronauts may lead to the bursting of blood vessels

GeographyClass 7All

Discuss how man affected the environment?

Ans. During his development and expansion, man totally ignored the environment. He ruthlessly carried out his activities without considering its impact on the environment. Some of the basic impacts of this expansion are: Deforestation: Trees absorb carbon throughout their lives by the process of photosynthesis. As man evolved, he slowly destroyed the forests. This caused several problems: less absorption of carbon dioxide from the atmosphere an

GeographyClass 7All

How does biosphere effect climate?

Ans. Biosphere has a great impact on the climate because it is closely connected to the atmosphere. When plants harness sun’s energy through photosynthesis, oxygen is released into the atmosphere and carbon dioxide is absorbed. When plants and animals respire, carbon dioxide is added to the atmosphere and oxygen is taken in. Microbes living in soils add nitrous oxide gas to the atmosphere. The burning of biosphere components such as fossil fuels, forests and fields adds

GeographyClass 7All

Write a short note on water?

Ans. Water is found in many places on earth like on the surface, within rocks below the surface and in the atmosphere. Water travels between different domains of the earth through water cycle. About 70% of the earth&rsquo;s surface is covered with water and most of it is in the ocean. Only a small portion appear as freshwater which is found in rivers, lakes and groundwater. Freshwater is needed for drinking, farming and washing. Therefore, without water life would not exist.<

GeographyClass 7All

What are the various uses of land?

Ans. Particular areas of land can be utilised by humans in various ways. It includes residential, institutional, business, industrial, agricultural, forestry, park and other relatively natural land uses. Each of these broader categories can be further subdivided based on the nature and intensity of the activities undertaken.

GeographyClass 7All

Discuss the various uses of water?

Ans Water is used for various purposes such as: Commercial water use includes fresh water for motels, hotels, restaurants, office buildings and other commercial facilities. Domestic water use is probably the most important daily use of water for most people. It includes using water at home every day for drinking, food preparation, bathing, washing clothes and dishes, flushing toilets and watering lawns and garde

GeographyClass 7All

What do you understand by ecosystem ecology?

Ans. Ecosystem ecology is an integrated study of biotic and abiotic components of an ecosystem and their interactions within an ecosystem framework. The study examines how ecosystems work and relates this to their components such as chemicals, bedrock, soil, plants and animals.

GeographyClass 7All

What do you understand by the statement “man modifies his environment”?

Ans. With the passage of time, our society has developed tremendously. Man&rsquo;s needs and demands increased manifold. As a result he started modifying nature to his own requirement; agricultural land converted to commercial areas, residences and industries; roads became crowded with traffic; smoke from vehicles caused air pollution and the honking of the horns to noise pollution. Hence, man is utilising natural resources at tremendous rate to satisfy his needs.

GeographyClass 7All

What are Selvas?

Selvas are dense, evergreen tropical rainforests found mainly in the Amazon Basin of South America. The term &ldquo;Selvas&rdquo; is commonly used to describe these thick forests that grow in regions with high temperature and heavy rainfall throughout the year. These forests are characterized by tall trees, thick vegetation, and a multi-layered structure. The trees form a dense canopy that blocks sunlight from reaching the ground, making the forest floor

GeographyClass 7All

Name the largest delta of the world?

Ans. The largest delta in the world is the Sundarbans Delta, formed by the rivers Ganga River and Brahmaputra River along with the Meghna River. It is located in India and Bangladesh and covers a vast area near the Bay of Bengal. The Sundarbans is known for its unique geographical features and rich biodiversity. It is made up of numerous small islands, tidal waterways, mudflats, and mangrove forests. These mangrove forests are specially adapte

GeographyClass 7All

Which river basin is the largest fertile river basin of the world?

The Ganga&ndash;Brahmaputra river basin is considered the largest fertile river basin in the world. It covers a vast area across countries like India, Bangladesh, Nepal, and Bhutan. This basin is formed by the combined drainage systems of the Ganga River and the Brahmaputra River along with their numerous tributaries. One of the main reasons for its high fertility is the continuous deposition of alluvial soil brought by these rivers from the Hi

GeographyClass 7All

What are the main crops of the Ganga–Brahmaputra plain?

Ans. The Ganga&ndash;Brahmaputra plain is one of the most fertile regions in the world, mainly due to the rich alluvial soil deposited by rivers like the Ganga River and the Brahmaputra River. This fertile land, along with abundant water supply and favorable climate, supports the growth of a wide variety of crops. The main crops grown in this region include wheat, rice, maize, and sugarcane. Rice is the most important crop, especially in areas

GeographyClass 7All

The Amazon basin is located in which continent?

Ans. The Amazon Basin is located in South America. It is one of the largest river basins in the world and is drained by the Amazon River and its numerous tributaries. The basin covers a vast area of about 7 million square kilometers and includes parts of several countries such as Brazil, Peru, Colombia, Bolivia, Ecuador, Venezuela, and Guyana. The Amazon Basin is well known for its dense tropical rainforest, often referred to as the &ldquo;lun

GeographyClass 7All

What is population density?

Ans. Population density refers to the number of people living in a specific area, usually expressed as the number of persons per square kilometer. It is an important concept in geography because it helps us understand how crowded or sparsely populated a region is. Population density is calculated by dividing the total population of a place by its total land area. For example, if a region has 10,000 people living in an area of 100 square kilome

GeographyClass 7All

The rain forests are depleting. Why?

Ans. The rain forests are located in the developing nations and for the sake of development these nations using their natural resources. That&rsquo;s why the rain forests are depleting from the surface of the earth. Though various nation and international societies are operating to save these natural forests but it is not enough.

GeographyClass 7All

Mention the climate conditions of the Amazon basin.

Ans. The climatic conditions and the weather conditions here are very unique. We can describe them in the following manner: Because of the equatorial location, heavy rain is the part of the day life in these areas. The temperature in these areas remains high through out the year which also because of its location. Because of the heavy rain and high temperature, very unique species of plant and animal nourish here.

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