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Learning Target: IWBAT describe biomagnification.

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Learning Target: IWBAT describe biomagnification.

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Learning Target: IWBAT describe biomagnification.

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Learning Target: IWBAT describe biomagnification.

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Learning Target: IWBAT describe biomagnification.

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Learning Target: IWBAT describe biomagnification.

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Learning Target:

•IWBAT describe biomagnification.

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•IWBAT describe biomagnification.

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•IWBAT describe biomagnification.

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Tutorials: After school

Warm Up Review1. In the nitrogen cycle, what is the role of bacteria that live in the roots of legumes?

a. change nitrogen gas into proteins that can be used by plantsb. change nitrogen gas form the atmosphere into ammonia and

ammonium ionsc. break down nitrogen compounds in the soil into nitrogen gasd. convert nitrate ions into ammonium ions

2. Which of the following statements about the nitrogen cycle is true? a. Although nitrogen is the most abundant atmospheric gas, plants cannot use it from the air. b. Adding man-made fertilizers to farm fields will take needed nitrogen from the cycle. c. The occurrence of lightning takes extra nitrogen molecules from the atmosphere and the cycle. d. Bacteria located in the soil trap excess atmospheric oxygen and help it enter plant roots.

90

KEY points

• Biodiversity is the variety of all life• Humans have a BIG impact on the biosphere• Biomagnification increases the chemicals

present at higher feeding levels

60

KEY points

• Biodiversity is the variety of all life• Humans have a BIG impact on the biosphere• Biomagnification increases the chemicals

present at higher feeding levels

KEY points

30

• Biodiversity is the variety of all life• Humans have a BIG impact on the biosphere• Biomagnification increases the chemicals

present at higher feeding levels

20

KEY points

• Biodiversity is the variety of all life.• Humans have a BIG impact on the biosphere.• Biomagnification increases the chemicals

present at higher feeding levels.

KEY points

10

• Biodiversity is the variety of all life.• Humans have a BIG impact on the biosphere.• Biomagnification increases the chemicals

present at higher feeding levels.

How Human Activities Affect Ecosystems

• Humans are part of Earth’s biodiversity – BIODIVERSITY= the variety of all life

• Human actions can greatly affect Earth’s biological, physical and chemical processes. – Natural Resource= part of the environment that is

used by humans or other organisms. • Earth’s supply of many natural resources is

limited and people sometimes use more of a resource than they actually need. – Examples: land, water, and air

Examples of how humans affect ecosystem

• Deforestation= removal of all trees in a forest– Destroys habitat, forcing species

to move out of the area reduces biodiversity

– Removing Key Stone Species= species that determines the community

• Pollution= release of harmful substances or energy into air, soil, and water

Examples of how humans affect ecosystem

• Global Warming= increase in average temperatures

• Pesticides can also harm the environment. – Can make an ecosystem

unstable by sickening or killing animals other than those

A little more about Pesticides…

• Sometimes, pesticides eaten by one organism are passed on to other organisms through the food chain.

• If a pesticide does not kill an animal that consumes it, it may be stored in the organism’s tissues.

• These pesticides are passed on to predators that eat the first animal.

bioMAGNIFICATION• Biomagnification= the

process in which chemicals become more concentrated at higher feeding levels.

Human Activities that Help the Environment

• Drive fuel efficient cars • Buy energy efficient appliances• Plant only native species in gardens• Use less paper• Use less water for washing, lawns• Grow and buy organic food• Eat only sustainably harvested fish

CLASSWORK

• Pages 10-11 must be finished in class!