1. Sand dunes along the coast are formed of bare sand. Eventually, grasses take root on the dunes. Over time, larger plants such as shrubs and trees are able to grow at the edge of the sand dune ecosystem. This gradual change in plant communities of a sand dune ecosystem can result in —

Question

Answer: Greater species diversity

2. Which statement best describes how bacteria recycle matter in an ecosystem? *
Answer: Bacteria are decomposers that help to transfer organic material to the soil.

3. In an experiment, two plants are grown together for a time and then separated. Plant 2 is a parasite of Plant 1. Which graph best predicts the growth of Plant 1 and Plant 2 during the experiment?
Answer: Plant 1 Increases while plant 2 decreases

4. Overfishing is causing the decline of fish populations, such as Eastern Atlantic bluefin tuna in the Mediterranean. Eastern Atlantic bluefin tuna are caught faster than they can reproduce. Which statement describes the most likely effect that overfishing will have on this ecosystem?
Answer: Overfishing decreases the stability of the ecosystem by disrupting food chains.

5. A farmer is struggling to control the population of a certain insect on his farm. After researching population control techniques, he discovers that a particular bird is a predator of this insect. The farmer purchases a number of these birds and releases them onto his farm. How might the farmer’s action most likely have a negative impact on the ecosystem?
Answer: The birds will consume beneficial insects, as well as the pest species.

Answer 1

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