Vocab
what is a herbivore?
Eats autotrophs
The removal of which of the following types of organisms would have the greatest negative effect on an ecosystem?
autotrophs
In the food web above, which population would increase the most if the grasshoppers were eliminated?
grasses
Why can there be no more than 5 links in a food chain?
There is not enough energy left after 5 different transfers
by what process is co2 removed from the atmosphere.
Photosythesis
what is a decomposer?
breaks down dead organisms
A crocodile allows an egret (a type of bird) to sit in its mouth and pull the bits of food from between its teeth. This relationship is an example of which of the following?
mutualism
If elements are to be recycled in nature, which organisms must be present?
decomposer
grass-mice-cat-coyotes
what happens to the enegry went it goes from grass to coyotes?
decrease
what two human activites contribute the most to global warming?
burning fossil fuels and deforestation
what is a symbiosis?
An interaction between organisms or species
A lack of resources and a growing population are most likely to result in
competition
A community in which Barn Owls and Snakes consume only Mice is observed. If the number of Snakes increases, which of the following is most likely to happen first?
The mouse population will decrease
what must occur for a poulation to grow?
the birth rate becomes higher than the death rate
in what way are humans most impacting the biodiversity of ecosystems around the world?
we are destroying the habitats of a large number of species
what is a commensalism?
an interaction in which one organism benefits and the other is not harmed
the construction of a new coal-burning power plant would have the greatest impact on which environmental issue
Production of acid rain
What is the function of autotrophs in the carbon cycle?
To use carbon dioxide to make glucose
what is the main suspected environmental problem associated with the burning of fossil fuels?
Global warming
All the wolves in an area were removed by people.These wolves primarily fed on a population of deer areain the area.What is most likely going to be result of removing the wolves?
The deer population will increase rapidly and then level off
what is a biacumulation?
toxins build up as you go up in trophic level
A remora fish uses a sucker on the top of its head to “hitch a ride” and feed on the scraps left behind by a shark. Since this has no negative effect on the shark, it is an example of what type of relationship?
commensalim
The concentration of chemical food contaminants is higher in birds of prey than in many of the individual organisms they eat. Which of the following statements best explains the reason for the higher concentration of food contaminants in birds of prey?
Chemicals are stored and magnified in organisms higher up the food chain
An increase in pesticide use has resullted in a decrease in the local bat population.which is the best explantion for this decrease.
bat food supply decreased
Which of the following is a sequence found in the nitrogen cycle?
Nitrogen in the air – Bacteria – Plants – Animals