Ecology Test Review

Front

What is a trophic pyramid?

Back

A trophic pyramid is a graphical representation of the energy flow in an ecosystem, showing the levels of producers, primary consumers, secondary consumers, and tertiary consumers.

Front

Which level of a trophic pyramid has the most energy available?

Back

Producers have the most energy available in a trophic pyramid.

Front

What role do producers play in an ecosystem?

Back

Producers, such as plants, convert sunlight into energy through photosynthesis, forming the base of the food chain.

Front

What is the primary source of energy for most ecosystems?

Back

The primary source of energy for most ecosystems is sunlight.

Front

What happens to energy as it moves up the trophic levels?

Back

As energy moves up the trophic levels, it decreases, with only about 10% of the energy being transferred to the next level.

Front

What is the impact of deforestation on carbon dioxide levels?

Back

Deforestation increases carbon dioxide levels because fewer plants are available to perform photosynthesis.

Front

What percentage of energy from grass is transferred to a hawk in a food chain?

Back

Only 1% of the energy from grass is transferred to the hawk.

Front

What is nitrogen fixation?

Back

Nitrogen fixation is the process by which certain microorganisms convert atmospheric nitrogen into a form usable by plants.

Front

How do microorganisms affect the soil in the nitrogen cycle?

Back

Microorganisms absorb atmospheric nitrogen through nitrogen fixation and make it usable for plants.

Front

What are decomposers and their role in an ecosystem?

Back

Decomposers break down dead organic matter, returning nutrients to the soil and completing the nutrient cycle.