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Science chapter 21
Terms in this set (44)
(True or False) A habitat is commonly described as the place where an organism sleeps.
(True or False) What an organism does is its habitat.
(True or False) Pigs and humans are examples of omnivores.
(True or False) Mutualism is any close relationship between different species.
(True or False) In a mutualistic relationship, one species benefits but the other is harmed.
Lichen is a combination of fungus and algae that lives on sides of trees, rocks, and other materials. The fungus provides the algae with water and minerals and the algae uses the water and minerals to make food for both organisms. what type of relationship does the lichen represent? (A. commensalism, B. mutualism, or C. parasitism)
Producers are organisms that get energy from which of the following? (A. herbivores, B. omnivores, C. carnivores, or D. sunlight)
An organism's habitat includes which of the following? (A. all of the resources an organism needs, B. only shelter for the organism, C. only food for the organism, or D. nothing at all)
A (all of the resources the organism needs)
An organism captures light energy from the sun to make its own food. This organism is which of the following? (A. consumer, B. predator, C. prey, D. producer)
What might an herbivore eat?
A _____ is made up of all the species that live in the same ecosystem at the same time.
What type of consumer gets their energy by eating dead organisms?
What is the harmed species in a parasitic relationship called?
The burrow a chipmunk digs under a patio stone is an example of a _____.
What are animals that feed on other consumers called?
Is a bacterial infection an example of symbiosis? why?
(yes, because symbiosis is a close relationship between two organisms that live together. This bacterial infection is living with that living being.)
(True or False) A population is experiencing exponential growth is growing slowly.
(True or False) Human population increases as medical care improves and becomes more available.
(True or False) Birthrate and death-rate need to be counted over the same time period.
When do populations increase?
When birthrates are higher than death-rates.
If a population becomes so low that the species is at risk of having no individuals remaining, what is it considered?
Which is in order from highest to lowest population?
threatened, endangered, extinct
During exponential growth, what statement is true?
The larger a population gets, the faster it grows.
What have humans been able to do that other species cannot?
increase the carrying capacity of their environment.
Which of the following contributes to the growth of human population? (A. more plentiful food supply, B. famines in drought areas, C. pollution, D. overworking crop lands)
A (more plentiful food supply)
How does better transportation lead to human population growth?
Resources from an area with plenty to spare can more easily be taken to areas of scarcity.
What is a cause of human population decrease? (A. advances in agriculture, B. medical care, C. damage from natural disasters, D. sewage treatment)
C (damage from natural disasters)
List 4 factors that contribute to the population decrease.
decrease in food, predation, disease, natural disasters
Spiders have a very high birthrate. Why is there generally not an overpopulation of spiders?
(There are other animals higher than the spider on the food chain, so those animals eats the spiders. Also, humans kill spiders whenever they see one and usually when there is a big group of living things born at the same time, many of them die at birth.)
(True or False) The largest number of individuals of one species that an ecosystem can support over time is its biotic potential.
false (carrying capacity)
(True or False) A habitat refers to all the population in an ecosystem.
(True or False) A community consists of all the organisms in an ecosystem that belong to the same species.
(True or False) A school of fish or a flock of pigeons is an example of population.
(True or False) Because a swamp is a limited area in which living and nonliving things interact, we call it a society.
Which of the following is not part of Earth's biosphere? (A. Pacific Ocean, B. Rocky Mountains, C. The Moon, D. Cuba)
C (The moon)
What is the difference between a community and an ecosystem?
An ecosystem consists of living and nonliving things in an area. A community is all the populations in that area.
What is the difference between a population and a community?
A population is made up of only one species. A community is made up of all species in an area.
If there are no limiting factors, a population can reach its _____.
What is the largest geographic area that contains all the ecosystems on Earth called?
Which statement is true? (A. An organism is part of a community, B. A community is part of a population, C. An ecosystem is only made up of organisms, D. A biome is the biotic part of an ecosystem)
A (an organism is part of a community)
A certain forest can support a population of 300 squirrels. This statement best describes _____.
the carrying capacity of the forest for squirrels
All of the fish in the GA aquarium would represent _____.
List the ecological levels of organization from largest to smallest.
biosphere, biome, ecosystem, community, population, organism (species)
List 3 things that are limiting factors on the growth of a population.
disease, natural disasters, sunlight
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