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11. Warm Up Review
1. 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 plants
b. change nitrogen gas form the atmosphere into ammonia and
ammonium ions
c. break down nitrogen compounds in the soil into nitrogen gas
d. 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.
12. 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
90
13. 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
14. 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
30
15. 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.
20
16. 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.
10
17. 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
18. 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
19. 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
20. 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.
24. 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
