Question

7. Environmentally our earth has changed, is changing and not necessarily for the better. What anthropogenic activities have been involved in bring about global change?

8. Why are small populations of life-forms associated with reduced genetic variability?

9. Describe the various pathways of natural selection.

10. Distinguish between sympatric and allopatric speciation.    

11. What 2 factors have caused disjunct distribution patterns in plants and animals?

12. In their native habitat, guppies (fish) live in tighter groups when they occur in streams in which predators are more common. Explain this phenomenon.

13. Why does cold temperatures limit the distribution of endothermic animals?

14. What are the consequences of the greenhouse effect on flora and fauna?

Answer 1

7.

EFFECTS OF ANTHROPOGENIC ACTIVITIES IN GLOBAL ENVIRONMENTAL CHANGES

Anthropogenic changes are those changes happens due to human action or presence. Anthropogenic changes are side effects of human activities which cause shortening of biodiversity that accompanies various environmental pollution result from industrialization and urbanization.

One of the good example of anthropogenic changes is increase in the amount of carbon dioxide that cause global warming. Another anthropogenic changes is increase in the emmission of green house effect due to deforestation. Increased burning of woods release huge amount of green house gases, Which will hold more thermal energy thereby increase earth's atmospheric temperature.

Industrialisation result in emmission of large amount of CO2 and other pollutants . This result in air pollution. Major uses of chemical fertilizers and pesticides also kept there residue in soil as well as water sources . This result in water pollution. Water pollution also affects the biodiversities in water sources also.