Despite having the great biodiversity why Amazon rain forest is under the risk of desertification.

Statement - I : The largely tropical Amazonian rain forest in North America has the greatest biodiversity on Earth. Statement - II : Amazon forest is home to more vertebrates than invertebrates.

Find the incorrect statement from the following . (a) Tropical rain forests cover around 6 percent of earth's land surface. (b) Animals with migratory habits are badly affected by habitat loss and fragmentation. (c) Mammals and birds require small territories. (d) Amazon rain forest is being cut and cleared for soya bean cultivation or for conversion to grasslands for raising beef cattle

(i) The term lungs of the planet is used for (ii) What is the main reason of deforestation of Amazon rain forest. (iii) How can high degree of endemisms is responsible for extinction of species.

Fill in the blank with appropriate words. (i) Major cuases of biodiversity losses called as……….. (ii) Amazon rain forest is being cut and cleared for cultivating ………. Or for conversion of grassland for raising………. (iii) Passenger pigeon has been become extinct due to............ (iv) When a species becomes extinct the plant and animal species associated with it in............ way also become extinct.

Fill in the blanks with suitable words : (i) ……… percent of the drugs currently sold in the market worldwide are derived from plants. (ii) Broadly utilitarian argument says that biodiversity plays a major role in……that nature provides. (iii) Amazon forest estimated to product through photosynthesis........percent of the total oxgyen in the earth's atmosphere. (iv) The........... argument for conserving biodiversity relates to what we owe to millions of plants animal and microbe species with whom we share this planet.

Fill in the blanks. I. The western Ghats have a greater amphibian diversity than the Eastern Ghats . The is an example of .......a........ II. India had more than 50 thousand strains of rice. This is an example of ...........b ........ III. Coral reef , mangroves and rain forest have greater diversity. This is the example of ......c.........

Consider the following six statements (a-e) about causes of biodiversity losses. a. Tropical rain forests once covering more than 14% of the earth's land surface, these forests now cover no more than 0.6%. b. Biological system should not be exploited beyond the degree of their renewability. c. Nile perch, a large predator fish was introduced into Lake Victoria of East Australia. d. Lantana is an indigenous plant of our country. e. Recent illegal introduction of the American catfish for aquaculture purpose is posing a threat to the indigenous catfishes in our rivers. Which of the above statement(s) is/are correct?

Fill in the blanks with suitable words in following statements. (i) Colombia located near the equator has about…….. Species of birds. (ii) More than 1,25,000 species of………. have been reported in Aamzonian rain forest. (iii) Favourable and less seasonal enviroments has helped.............organism to gain more niche specialisation. (iv) Value of slope of regression (Z) of species-area relationship lies in the range of............molluscs in New York state.

What is biodiversity? Why are forests considered as "biodiversity hot spots"? List two factors responsible for causing deforestation.

Two wires have masses in the ratio 3:4. They are made of the same material. Under the same load what is ratio of their elongations ? Explain why?