Flow of matter and energy

Front

What is denitrification?

Back

Denitrification is the process by which bacteria convert nitrates (NO3-) into nitrogen gas (N2), releasing it into the atmosphere, often occurring in oxygen-limited environments such as saturated soils.

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What is respiration in the context of energy flow?

Back

Respiration is the biochemical process in which organisms convert glucose and oxygen into energy, carbon dioxide, and water, playing a crucial role in the flow of energy through ecosystems.

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What does a pyramid of biomass represent?

Back

A pyramid of biomass illustrates the total mass of living matter at each trophic level in an ecosystem, showing how energy decreases as it moves up the food chain.

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What is a tertiary consumer?

Back

A tertiary consumer is an organism that occupies the third trophic level in a food chain, primarily feeding on secondary consumers.

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What is a quaternary consumer?

Back

A quaternary consumer is an organism that occupies the fourth trophic level in a food chain, feeding on tertiary consumers.

Front

What is nitrogen fixation?

Back

Nitrogen fixation is the process by which certain bacteria convert atmospheric nitrogen (N2) into ammonia (NH3) or related compounds, making nitrogen available to plants.

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How does flooding affect soil oxygen levels?

Back

Flooding saturates the soil with water, limiting the availability of oxygen (O2) for soil organisms, which can lead to anaerobic conditions.

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What role do leguminous plants play in nitrogen fixation?

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Leguminous plants, such as soybeans and peas, have root nodules that house nitrogen-fixing bacteria, allowing them to convert atmospheric nitrogen into a usable form for plants.

Front

What is the significance of food webs in ecosystems?

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Food webs illustrate the complex feeding relationships between organisms in an ecosystem, showing how energy and nutrients flow through different trophic levels.

Front

What is the difference between a food chain and a food web?

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A food chain is a linear sequence of organisms through which energy and nutrients flow, while a food web is a more complex network of interconnected food chains.