IB Biology Topic 2

How does energy enter an ecosystem?

• sunlight

• soil

• animals

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All life on Earth exists in a region known as 

• an ecosystem

• a biome

• the biosphere

• ecology

Why are food chains, such as the one shown, limited to 4-5 organisms?

• There are not more organisms in the ecosystem

• Organisms must share resources

• Energy transfers are inefficient

• They are only limited when organisms are living on land.

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NGSS.MS-LS2-3

Which organism do the owl and the weasel compete for in the food web?

• Hawk

• Spider

• Grasshopper

• Shrew

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Which of the following processes removes carbon from the atmosphere?

• Plant Respiration

• Auto and factory emissions

• Photosynthesis

• Animal Respiration

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The rate at which producers convert radiant energy into chemical energy

• trophic level

• net primary productivity

• gross primary productivity

• photosynthesis

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The arrows in a food chain or web represents what?

• They point to the organism that is being eaten.

• It shows how sunlight flows within an ecosystem.

• They show what direction the energy is flowing between organisms. 

• They represent how water is transferred within a habitat.

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NGSS.MS-LS1-6

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All of the production by photosynthetic organisms in a defined area over a specified time period is known as

• Gross Productivity

• Net Productivity

• Photosynthesis + Respiration

• Photosynthesis - Respiration

__________ primary productivity is the total amount of energy that producers convert to chemical energy in organic molecules per unit of time.

• Net

• Total

• Gross

• Secondary

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NGSS.MS-LS1-6

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Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?

• Less than 1%

• 2-10%

• 30%

• 50%

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NGSS.MS-LS1-6