Each question has marks beside it indicating the length needed for the replies!
1. Explain why productivity is typically higher in coastal areas of the ocean than in areas farther away from the shore.
2.A scientist is studying the changes in nitrogen content of plant litter during decomposition, using a litter bag experiment. Shortly after her experiment starts, nitrogen content declines to 80% of the original content and then begins to increase. Nitrogen content increases to 120%, and then after some time, it slowly declines to 40%. Explain her results.
3.Explain how human activities have affected the sulphur cycle.
4.Describe how the characteristics of a stream change as it flows from its source to its outlet.
5.What results would you expect from a survey of species richness on a sandy oceanic beach? Why?
6.What are the three major arguments for preserving biodiversity?
7.Discuss three major causes of current species extinctions. What is the primary cause?
8.How might climate change affect the distribution of species along the altitudinal gradient of a mountain?