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According to the famous ecologist Norman Myers, about 80,000 species of plants and animals are consumed by humans as food. The entire food procurement of the world is mainly dependent on wheat, rice, maize, barley, sorghum , bajra, soyabean, beetroot, tur, coconut, potato, cassava, chick peas, fieldbeans, sugarcane etc.

Apart from these, various types of fruits like banana, mango, papaya, grapes, apples, oranges, watermelons, melons etc. and various typeset vegetables, like – brinjal, ladies finger, cabbage, tomato, etc. and various types of fish and marine creatures play a major role in the world’s food supply. Apart from these, ginger, black pepper, turmeric, saffron, coriander, asafoetida, fennel seeds, cumin, oregano, bay leaf, etc. are also used in domestic and commercial form.

The medicine named quinine is obtained from the bark of cinchona tree.

Seeing wild animals living in their natural habitat in an independent and fearless way is called eco – tourism seeing and experiencing different native surroundings is also included in this

Correct Answer is: (b) 78 per cent

The Concept of bio – diversity has evolved in the past years due to environmental degradation.

Correct Answer is: (c) Wilson

The part of the earth’s surface which is covered with water is called hydrosphere.

The number of species of living organisms and plants available in any natural region is called bio – diversity.

Growth in global temperature, climate change, thinning of ozone layer and acid rain are the natural causes for bio – diversity depletion.

In nature, the same type of organisms, worthy of productive life and reproduction are called species.

Connecting of the genes of the organisms of any species shows the position of the genetic fund.

The highest bio – diversity in the world is found in coral reefs, wet regions, mangrove ecosystems and tropical ecosystems.

The first Earth Summit was organised in Rio – de – Janeiro, Brazil and the Second Earth Summit was organised in 1992 in the city of Johannesburg, South Africa, in 1992.

The highest bio – diversity in the world is found in equatorial region on both sides of the equator and the lowest bio – diversity is found on the poles.

Proper management of preserving bio – diversity and natural resources, to check the continuous decline in bio – diversity while keeping human interest in mind, is called the conservation of bio – diversity.

Genetic pool and the collection of genes of the organisms of various species.

Four National parks, 26 sanctuaries, 35 prohibition areas and 5 zoos have been set up in Rajasthan for the conservation of wildlife.

Correct Answer is: (b) Khejri

(d) Sawai Madhopur

Correct Answer is: (c) 4