Ecosystems
When a new species enters an ecosystem and completes with native species for food, the most likely resul is...
1. no change to the ecosystem
2. extinction of all species
3. changes in population sizes
4. increased sunlight
Changes in population size
Where does most energy come from?
The sun
What would most likely happen if decomposers disappeared from an ecosystem?
1. dead organisms would build up
2. plants would grow faster
3. consumers would disappear immediately
4. the sun would stop providing energy
dead organisms would build up
What is a food chain?
A food chain shows how energy moves between organisms.
What is a food web?
A diagram showing many connected food chains.
What is the main role of producers in an ecosystem?
1. they eat other organisms for energy
2. they break down dead organisms
3. they make their own food using sunlight
4. they hunt other animals
They make their own food using sunlight
A fox hunting a rabbit is an example of...
1. mutualism
2. commensalism
3. predator-prey relationship
4. parasitism
predator-prey relationship
What happens if one species is removed?
The ecosystem becomes unbalanced and other species may be affected.
What is an Ecosystem?
An ecosystem is a community of living and nonliving things interacting.
What is a population?
A population is a group of the same species in one area.
If the deer population decreases, what will most likely happen to the snake population?
1. increase
2. decrease
3. stay the same
4. become producers
Decrease
Plants make food through the process of Photosynthesis. Which energy source is required for this process?
1. water
2. sunlight
3. soil
4. oxygen
sunlight
What is a producer?
a living organism that makes its own food
Which organism is most likely a decomposer?
1. oak tree
2. mushroom
3. deer
4. hawk
mushroom
Which example represents mutualism?
1. a tick feeding on a dog
2. bees pollinating flowers while collecting nectar
3. a hawk catching a mouse
4. moss growing on a rock
bees pollinating flowers while collecting nectar
What role do decomposers play?
Decomposers break down dead matter and recycle nutrients.
In the food chain below:
sun --> grass --> grasshopper --> frog --> snake
Which organism is the primary (first) consumer?
grasshopper
Scientists discover that a fungus disease is killing many trees in a forest ecosystem.
Describe two ways this could affect the food web.
Herbivores lose food.
Animal populations may decrease.
Which situation is an example of parasitism?
1. a bird building a nest in a tree
2. a flea feeding on a dog
3. a fish hiding in coral
4. a bee pollinating a flower
a flea feeding on a dog