1) An ecosystem is formed by the interaction between: a) Only plants and animals b) Biotic and abiotic components c) Only air and water d) Only microorganisms 2) Which of the following is a biotic component of an ecosystem? a) Soil b) Air c) Water d) Plants 3) Which of the following is not an abiotic component? a) Temperature b) Soil c) Animal d) Air 4) Which of the following is an example of an aquatic ecosystem? a) Forest b) Farmland c) Pond d) Grassland 5) Which of the following is a human-made ecosystem? a) Farmland b) Lake c) River d) Forest 6) In Fig. 12.6, overlapping ecosystems are shown because: a) Only aquatic ecosystems are present b) Only terrestrial ecosystems are present c) There is no interaction between ecosystems d) Both terrestrial and aquatic ecosystems interact 7) Plants prevent soil erosion by: a) Holding the soil with their roots b) Increasing temperature c) Producing carbon dioxide d) Absorbing oxygen 8) During photosynthesis, plants release: a) Nitrogen b) Oxygen c) Carbon dioxide d) Water vapor 9) Which of the following provides medium and nutrients for plant growth? a) Sunlight b) Soil c) Air d) Water

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