Holt Environmental Science Chapter 7

Front

What organism produces most of the food in an aquatic ecosystem?

Back

Phytoplankton are the primary producers in aquatic ecosystems, converting sunlight into energy through photosynthesis.

Front

What is one environmental function that wetlands do not perform?

Back

Increasing runoff is not an environmental function of wetlands; they actually help to absorb and retain water.

Front

Why are estuaries considered very productive ecosystems?

Back

Estuaries receive fresh nutrients from rivers and oceans, which support diverse plant and animal life.

Front

What is a characteristic that is not true for both salt marshes and mangrove swamps?

Back

Both are not dominated by marsh grasses; mangrove swamps are characterized by salt-tolerant trees.

Front

What are some threats to coral reefs?

Back

Coral reefs face threats from oil spills, sewage, pesticides, and other pollutants.

Front

Define 'phytoplankton'.

Back

Phytoplankton are microscopic plants that float in water and are crucial for aquatic food webs.

Front

What role do wetlands play in water quality?

Back

Wetlands absorb and remove pollutants from water, improving overall water quality.

Front

What is the difference between salt marshes and mangrove swamps?

Back

Salt marshes are dominated by herbaceous plants, while mangrove swamps are characterized by woody trees.

Front

What is the significance of estuaries in the environment?

Back

Estuaries serve as nurseries for many marine species and provide critical habitats.

Front

What is the impact of development on coastal ecosystems?

Back

Development threatens coastal ecosystems like salt marshes and mangrove swamps by reducing habitat and biodiversity.