Human Impact on Ecosystems
Which activity increases carbon dioxide levels: planting trees or driving cars?
Driving cars
What type of organism is at the base of every food chain?
Producers
Is space for barnacles a biotic or abiotic factor?
Abiotic
What process turns water vapor into liquid water?
Condensation
What is the primary source of energy for all ecosystems?
The sun
Name one way humans can decrease their impact on ecosystems
Recycling or conserving energy
Which organism gets the least energy in a food chain?
Apex predator or top consumer
Give an example of a biotic factor that limits population growth
Predation or competition for food
What process in the water cycle involves water turning into vapor?
Evaporation
In a food pyramid, which level gets the most energy?
Producers
Which human activity directly removes oxygen-producing organisms
Cutting down trees
What role does cyanobacteria play in the food pyramid of a lake ecosystem?
Producer
What are two resources snakes need to survive?
Water and mice
What is the term for water falling from the sky as rain, snow, or hail?
Precipitation
What happens to energy as it moves through an ecosystem?
it decreases
Why is heavy rainfall for several days not considered a human activity that increases carbon dioxide?
Its a natural process
Why does energy decrease as you move up the food chain?
Energy is lost as heat and used for life processes
What term describes water and sunlight in an ecosystem?
Abiotic factors
What cycle involves plants producing oxygen during photosynthesis and animals releasing carbon dioxide during respiration?
Carbon cycle
Why are decomposers important in the energy cycle?
They recycle nutrients back into the soil
Name three human activities that increase carbon dioxide levels
Running, driving, cutting down trees
Identify an example of a food chain in a forest ecosystem
Grass → Rabbit → Fox → Hawk
Why would cutting down trees in a rainforest increase carbon dioxide levels?
Trees absorb carbon dioxide during photosynthesis
Name three processes involved in the water cycle
Condensation, evaporation, precipitation
Name an example of an energy transfer from producer to consumer.
Grass is eaten by a rabbit