Class 8 Science Chapter 7 MCQ

Clearing of land to plant crops and build road is responsible for extinction of a species.

The process by which fertile land becomes desert is called desertification. It takes place due to the deforestation. When forest trees are cut, there will be no roots to bind the soil particles together and prevent them for from carrying away. Thus, the top layer of soil erodes out exposing the lower hardy and rocky soil layer. This layer is not for fertile. Gradually, plants do not grow well and fertile land gets converted into a desert.

A Biosphere Reserve is a large, protected area of land meant for the conservation of wildlife, biodiversity and the traditional lifestyle of tribal people (i.e., culture) living in the area.

Wildlife sanctuaries are some areas where wild animals are protected and preserved.

Wildlife sanctuary, national parks are in situ conservation methods of biodiversity. These places are meant for conservation of species in their “Natural Habitat”. The other options i.e., zoological and botanical gardens are ex situ conservation methods. These places conserve the species outside its natural habitat.

Endemic species are those species of plants and animals which are found exclusively in a specific habitat. Example, Sal and wild mango are endemic plants of Pachmarhi Biosphere Reserve. Their existence in endangered by the destruction of their habitats, increasing human population and introduction of new species.

A wildlife sanctuary is a protected area, which is artificially created for the protection of wild animals in their natural habitat. Killing (poaching) or capturing of animals is strictly prohibited in these areas.

Here, all the statements are correct. Hence, your answer will be option [D].

The biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, geosphere, hydrosphere, and atmosphere. It is due to coexistence of these spheres the life can exist on earth.

Blackbuck, elephant, python and golden at together represent fauna in a forest. The animals of particular area called fauna of that area. Flora is the plants of a particular area. Ecosystem includes all the living organisms of an area and their physical environment. Species is a group of population which are capable of interbreeding.

Endemic plants are special because they are found in only one location on the planet, and nowhere else. It is due to their survival in particular climatic and geological conditions.

The process of a bird moving from one place to another due to the climatic changes is called migration. It is an adaptation to escape extreme weather conditions and lack of nesting areas. The fly for laying eggs as the weather in their natural habitat becomes very inhospitable.

Here all the statements are correct. Hence, your answer will be option [D].

The core zone of a Biosphere Reserve is devoted to strict protection of wildlife.

Kanha Tiger Reserve, also known as Kanha–Kisli National Park, is one of the tiger reserves of India and the largest national park of the state of Madhya Pradesh. The present-day Kanha area is divided into two protected areas, Hallon and Banjar, of 250 and 300 square kilometers (97 and 116 sq mi), respectively. Kanha Tiger Reserve hosts populations of tiger, leopard, wild dog, sloth bear, foxes and jackals. Barasingha is adapted to hard ground. Gaur (Bos gaurus) inhabits meadows and waterholes in the park. Blackbuck has become very rare.

Keoladeo National Park or Keoladeo Ghana National Park formerly known as the Bharatpur Bird Sanctuary in Bharatpur, Rajasthan, India is a famous avifauna sanctuary that hosts thousands of birds, especially during the winter season. Over 230 species of birds are known to be resident. Keoladeo Ghana National Park is a man-made and man-managed wetland and one of the national parks of India. The reserve protects Bharatpur from frequent floods, provides grazing grounds for village cattle, and earlier was primarily used as a waterfowl hunting ground.

Here, all the statements are correct. Hence, your answer will be option [D].

Deforestation will cause an increase in temperature of earth’s atmosphere leading to global warming. When a lot of trees are cut down during deforestation then lesser number of trees will be left. As carbon dioxide will increase in the atmosphere. Trapping of heat rays by carbon dioxide increase the temperature of earth’s atmosphere.

Here, all the statements are correct. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].

Sanjay Gandhi National Park, formerly Borivali National Park, is a large protected area in the northern part of Mumbai city in Maharashtra State in India.

The snake expensive skin is sold in market for expensive drugs and ointment.

The siberian crane comes to India and is found in Satpura as the weather in Siberia is extreme with scarcity of food and light.

Cycling of cardboard cartons will lead to a decrease in the level of tree cutting and hence conserve forests.

Bandipur National Park, an 874-sq.-km forested reserve in the southern Indian state of Karnataka, is known for its small population of tigers.