Interactions in Ecosystems
When two species compete for the same resource, what type of interaction is this?
Competition
What is the main source of energy for almost all ecosystems?
The Sun
Give an example of an abiotic factor.
Answers vary.
What is a limiting factor?
Anything that restricts population size.
What are the three main types of ecosystems on Earth?
Freshwater, terrestrial, marine
A wolf hunts and eats a rabbit. What type of relationship is this?
Predator-prey
What happens to the amount of energy as it moves up the food chain?
It decreases.
What do arrows in a food chain represent?
The direction of energy flow
What happens to a population when resources decrease?
It decreases.
What kind of ecosystem has both salt and fresh water?
Estuary
A bee pollinates a flower while getting nectar. What kind of relationship is that?
Mutualism
Which type of organism uses a nonliving source of energy to make food?
Producer
What process allows nutrients to be returned to the soil
Decomposition
The predator population will decrease and the prey population will increase.
What biome has oak and hickory trees with leaf litter?
Temperate deciduous forest
A flea feeding on a dog’s blood represents what type of symbiosis?
Parasitism
Which of the following shows the correct energy flow?
A. Owl → Finch → Insect → Grass → Sun
B. Sun → Grass → Insect → Finch → Owl
C. Grass → Owl → Sun → Finch → Insect
D. Finch → Grass → Owl → Sun
B. Sun → Grass → Insect → Finch → Owl
How are soil, air, and water important to an ecosystem
TThey are nonliving parts that provide matter.
What does competition for food and resources do to a population?
It can decrease the population.
Why wouldn’t a rainforest plant survive in a desert
Not enough water or nutrients
Which statement best describes the difference between competition and predation
Competition is when organisms fight over shared resources.
Why are decomposers important to energy flow?
recycle nutrients into the soil.
What does the Law of Conservation of Energy state?
Energy and matter cannot be created or destroyed.
What are some factors to cause a population to increase?
Answers vary
What is the main threat to spotted owls from logging?
Loss of habitat