Revision Biology Midyear Exam 2011-06-101. What is an ecosystem?

2. How are plants important to the survival of organisms in an ecosystem?

3. What is a food web?

4. Explain the importance of decomposers to an ecosystem. Give 2 examples of decomposers.

5. What is photosynthesis? Write the word equation for photosynthesis. What types of organism perform photosynthesis?

6. How are matter and energy transferred from organism to organism in a food chain?

7. How does most energy enter an ecosystem? How is most energy lost from an ecosystem?

8. How does the flow of matter in an ecosystem differ from the flow of energy in an ecosystem?

1. Explain the meanings of the following words.Biodiversity PopulationEstuary

2 What are plankton any why are they so important?3. Tides are considered an abiotic factor that affects organisms living in an ecosystem.

Explain this statement and give examples of other abiotic factors that could affect marine life around South Australian waters.

4. By way of examples taken from a marine environment show that you understand what a food chain is and how a food web is more complex.

5. Why are sea grasses so important to the marine ecosystems? What is causing the decline of the abundance of sea grasses?

6. Caulerpa taxifolia is an introduced pest. Explain how it was introduced to South Australian waters. By what other means are introduced species brought into South Australian water?

Q7.

Study the following food web.

a Name the producer organisms in this food web.

b Give 3 examples of a food chain from the food web above that each contain 4 organisms.

c What important group of organisms are missing from the food web shown above?