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Presentation G 2
- 1. OPTION G ECOLOGY AND CONSERVATION G2 Ecosystems and biomes
- 8. G.2.5 Construct a pyramid of energy, given appropriate information. (3) Tertiary consumers Secondary consumers Primary consumers Producers 10 kcal 100 kcal 1,000 kcal 10,000 kcal 1,000,000 kcal of sunlight
- 11. G.2.6 Distinguish between primary and secondary succession, using an example of each. (2) A pioneering group of plant species will arrive on the island contribute to the development of an ecosystem that will eventually stabilize with different dominant species. The change in dominant species with time occurs as a result of the pioneering species altering the abiotic conditions such that other species become more suited.
- 13. G.2.7 Outline the changes in species diversity and production during primary succession. (2) Here is one example of primary succession. Often the only life forms present are autotrophic bacteria. Lichens and mosses grow from windblown spores. Soil develops gradually as rocks weather and organic material accumulates.