Pond Ecosystem

All animals need oxygen. How do fish get their oxygen?

• From the air

• From the water using their gills

• From the soil

• From sunlight

Where does the "fizz" in soda come from?

• From nitrogen gas

• From oxygen gas

• From carbon dioxide gas

• From hydrogen gas

What is the unit for measuring the concentration of oxygen in water?

• Parts per hundred

• Parts per thousand

• Parts per million

• Parts per billion

What are biotic factors in a pond ecosystem?

• Temperature and dissolved oxygen

• Fish, aquatic plants, insects, and bacteria

• Sunlight and water

• Fishing poles and gizmos

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What are abiotic factors in a pond ecosystem?

• Fish, aquatic plants, insects, and bacteria

• Temperature and dissolved oxygen

• Sunlight and fishing poles

• Gizmos and predictions

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What process is responsible for the production of dissolved oxygen in a pond by pond plants and algae?

• Respiration

• Filtration

• Photosynthesis

• Decomposition

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Why does the level of dissolved oxygen go down after sunset in a pond?

• Because of increased water temperature

• Due to the absence of sunlight for photosynthesis

• Because fish consume more oxygen at night

• Due to the fishing poles being removed from the pond

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Which statement best describes the relationship between dissolved oxygen levels and the presence of trout, based on the data?

• Higher levels of dissolved oxygen are associated with the presence of trout.

• Trout are found in ponds with the lowest levels of dissolved oxygen.

• The number of trout is unaffected by the levels of dissolved oxygen.

• Trout are more numerous in ponds with farms.

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Based on the experiment, which type of fish can survive better in low-oxygen conditions?

• Trout

• Catfish

• Both trout and catfish

• Neither trout nor catfish

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According to the activity, how does temperature affect the concentration of dissolved oxygen in water?

• Temperature does not affect the concentration of dissolved oxygen.

• Higher temperatures increase the concentration of dissolved oxygen.

• Lower temperatures increase the concentration of dissolved oxygen.

• The concentration of dissolved oxygen is the same regardless of temperature.

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