Chapter 20 Matter and Energy in the Environment

What happens during the process of nitrogen-fixation?

• bacteria help turn nitrogen compounds into free nitrogen

• bacteria help turn free nitrogen into nitrogen compounds

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What happens during the process of denitrification?

• bacteria help turn nitrogen compounds turn into free nitrogen

• bacteria help turn free nitrogen turns into nitrogen compounds

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Which of the following are products of photosynthesis?

• oxygen, glucose
• glucose, carbon dioxide
• useable energy, glucose
• oxygen, carbon dioxide

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What 3 things are made during cellular respiration?

• useable energy in the form of ATP, water, glucose

• glucose, water, carbon dioxide
• oxygen, carbon dioxide, glucose
• carbon dioxide, water, useable energy in the form of ATP

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In an ecosystem

• energy is recycled through the food web

• chemicals are recycled between the biotic and abiotic sectors

• chemical elements are lost through soil runoff when rain occurs

• energy from sun is efficiently passed to secondary producers

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What limits the number of trophic levels in a food chain?

• biomass of the autotrophs

• efficiency of energy conversion between the levels

• net productivity of the ecosystem

• biodiversity in the ecosystem

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Autotrophs that can trap the sun's energy and use it for photosynthesis.

• Producers

• Productivity

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How do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the food they eat

• From the sun

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Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

• Assimilation

• Fixation

• Ammonification

• Denitrification

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