Biotic vs. Abiotic
What does biotic mean?
Living
Define predator-prey relationship.
A feeding relationship where the predator is the animal that kills and feeds on the prey
What is the original energy source for ALL ORGANISMS in an ecosystem?
THE SUN!!!!!!!!
What do animals use energy for while they're alive? Name at least 2 things.
Animals use energy to live, eat, grow, hunt, walk, fly, etc.
What is a dead zone?
An area at the bottom of the ocean where there is not enough dissolved oxygen for marine animals to survive.
True or false: Water is a biotic factor of an environment.
False. Water is an abiotic factor.
Lions hunt and eat gazelles. What is this organism interaction called? What is the lion in this interaction? What is the gazelle in the interaction?
Predator-prey relationship.
Lion is predator.
Gazelle is prey.
Which way does energy flow in a food chain?
a. top --> bottom
b. bottom --> top
b. Bottom --> top
Can energy only flow in one direction in a food chain or can it flow in any direction?
Energy can only flow in one direction in a food chain.
Wolves get energy from eating rabbits. Rabbits get energy from eating grass. The grass makes its own food energy. If all the wolves were killed, then…
a. there would be more rabbits.
b. there would be fewer rabbits.
c. more grass would grow.
d. less grass would be eaten.
a. there would be more rabbits
True or false: Bacteria is a biotic factor of an ecosystem.
True.
Mutualism, Commensalism, and Parasitism are three different types of what kind of organism relationship?
Symbiosis
Where is the apex predator located in a food chain?
The very top.
What trophic level is responsible for converting sunlight into energy?
a. decomposers
b. consumers
c. producers
c. producers
What is overfishing and what effect can it have on an ocean ecosystem?
Overfishing is when humans fish too much of a certain species of fish for food and/or money. It can cause certain species of fish to become endangered or even extinct. It can also harm other sea animals because it can take away their food source.
This graph shows the interaction between biotic & abiotic factors in an environment (picture). What is the biotic factor? What is the abiotic factor? Describe what the graph is telling us about this interaction.
It shows the relationship between deer population and average snowfall over a series of years. It shows that as snowfall increases, deer population decreases, and vice versa.
What is the organism interaction between a human and a tick?
Parasitism.
This is the position that an organism occupies in a food chain: __________ levels.
Trophic levels.
What happens to an organism's energy when it dies?
Energy leaves an organism when it dies. Decomposers get energy from breaking down the dead organism.
A population of deer lives in Canada. Over 50 years, the size of the deer population decreased. What best explains the decrease in the size of the deer population?
a. A lot of deer died and none were born.
b. Fewer deer were born than died.
c. The deer population is always decreasing because deer are always being eaten.
d. More deer were born than died.
b. Fewer deer were born than died.
Mutualism is a symbiotic relationship that :
a. Helps both species involved
b. Helps one species and has no effect on the other.
a. Helps both species involved
Bears and wolves of Yellowstone national park both like to eat rabbits. Recently the rabbit population has gone down and so bears and wolves have to fight to get the food they need. What is this organism interaction called?
Competition
This image shows a food web. Why are the arrows facing the way they do? What do the arrows represent?
They represent the flow of energy from an organism's food source the organism. They are facing the way they do because the energy flows from the organism that is consumed to the organism that consumes it.
What effect can a natural disaster like a forest fire have on the energy flow of an ecosystem?
It can destroy an ecosystem, but eventually, the ecosystem can be reborn because the fire clears the way for producers to grow and receive the sunlight they need and then provide energy for the primary consumers, and then secondary consumers, and so on.
A food chain is shown below.
Grasses → Crickets → Field Mice → Hawks
Which of the following would have the most severe consequences for the food chain shown?
a. A drastic decrease in rainfall, causing drought.
b. The poaching of predatory hawks by game hunters.
c. The introduction of a second predator that eats field mice.
d. A parasitic infestation that reduces the cricket population.
a. A drastic decrease in rainfall, causing drought.