15. Why are there so many species stilli unknown to modern science? a. Many of t

Question

15. Why are there so many species stilli unknown to modern science? a. Many of these species are found in remote environments b. Smaller species receive less attention than large organisms c. Cataloging these species is a huge task. d. all of the above 16. Where are many critical biodiversity hotspots located? a. cities and developed areas of the world b. islands, tropical rain forests, and coastal areas c. desert and polar environments d. all of the above 9. Three percent of the world's water resources are found as a. fresh water b. salt water. c. icecaps and glaciers. d. groundwater. 10. Most of the pollutants in the ocean come from a. commercial boats and personal watercraft. b. spills from oil tankers. c. activities on land. d. leaking underground storage facilities. 11. The largest watershed in the United States is the a. Mississippi River. b. Yukon River c. Colorado River. d. Rio Grande.

Explanation / Answer

Answers:

15. The answer should be a. Many of these species are found in remote environments. Tropical rain forests and deep ocean are two ecosystems where intense biodiversity is found. Howerver, these two are also the most remote areas to reach and catalog all the species found here.

16. The answer should be b. Islands, tropical rain forests, and coastal areas. Biodiversity hotspots are regions which have significant biodiversity but are facing destruction. Tropical forests are the most critical biodiversity hotspots as it contain significant number of known and unknown species of plants and animals. Islands also give rise to unique biodiversity where exotic plants and animal species are born which are not found in any other part of the world such as in Madagascar.

9. The answer should be a. fresh water. Of this little amount of fresh water, most of it (about 69%) is concentrated in polar ice caps and glaciers while most of the rest part is groundwater with very little part is found above the ground.

10. The answer should be c. activities on land. Most of the ocean pollution is occuring because of direct sewage discharge in form of hazardous chemicals and wastes from urban areas of industries and surface runoff as agricultural runoff or runoff from sites of construction, harbours etc.

11. The answer should be a. Mississippi River. Watershed area is the entire river basin area. Mississippi river basin area is also the second largest river watershed area in the world after Nile river in Africa.

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