Chap 5,6 Flashcards
(28 cards)
The movement of organisms out of an area is called ______
Emigration
The movement of organism into an area is ______
Immigration
What must occur in a population for it to grow?
More births then deaths
What must happen in a population for it to decrease?
More deaths then births, more emigrants then immigrants
When individuals in a population increase at a constant rate,it is called _______ growth.
Exponential
Most populations go through various phases called ______ growth.
Logistic
What is an abiotic factor?
Nonliving factor
What is a biotic factor?
Living factor
What causes a population size to decrease?
Deaths higher then births
Competition,disease,predator-prey are examples of _____-______ factors
Density-dependent
Would a small population or a large population be more affected by a density-dependent limiting factor?
Large population
Extreme weather,volcanoes,tsunamis,flood and drought, human activities are examples of _____-______ factors
Density-independent
A disease is considered what type of limiting factor?
Density dependent
What event caused the human population to experience exponential growth?
Industrial Revolution
The anticipated human population by the year 2050 is ________?
9 billion
Why are fossil fuels nonrenewable?
Takes a long time to make
Sulfur and nitrogen compounds combine with water to from _____ _____.
Acid rain
What does a endangered organism mean?
A species whose population size declining in a way that places it in danger of extinction
What is DDT and what was it used for?
Pesticide, sprayed on crops
Why is DDT harmful?
Nonbiodegradable, picked up by organisms and they do not eliminate form body.
Do some scientist think global warming is a result of human activities?
Yes
Is global warming melting ice caps?
Yes
Do some scientists think global warming is a natural variation of climate?
Yes
What is one cause of ozone depletion?
CFC’S
