Worksheets8.3.5 Natural Selection Practice 3
Total questions: 11
Worksheet time: 11mins
Organisms change over time to meet the demands of the environment in which they live.
True
False
Selection is when an organism chooses something based on it's needs in the environment.
True
False
Adaptations happen because successful traits are passed from generation to generation.
True
False
What are the THREE conditions needed for natural selection to occur? SELECT THREE ANSWERS.
There must be variation in characteristics.
There must be no differences between organisms in a population.
There must be a difference in fitness (ability to reproduce).
The trait that affects fitness must be inheritable (passed on to other generations).
What is natural selection?
Organisms with favorable (better) traits will reproduce and survive.
Organisms within a population all have the same chances of survival.
All organisms in a species have the exact same traits.
Organisms in a population will all eventually disappear.
What is a trait?
Only a physical difference between organisms of the same species.
A skill that can only be learned through practice.
When an organism changes over time.
A characteristic of an organism.
For natural selection to have produced the long necks of giraffes, what must have been true over the evolutionary history of giraffes?
The giraffe offspring with longer necks survived and reproduced.
In every generation, the length of giraffes’ necks showed variation.
All giraffes, regardless of neck length, had an equal chance of survival.
Abundant resources insured that competition among giraffes was limited.
Natalie's dog had puppies, but the puppies looked very different from the mother and from each other. This was due to natural genetic variation. Which of the following describes how genetic variation contributes to evolution?
Genetic variation within a population means that all organisms will be better suited for survival.
Genetic variation results in offspring only receiving from their parent's helpful characteristics.
Genetic variation increases the ability of a species to survive environmental changes.
Genetic variation results in a higher number of offspring produced in each generation.
A population of beans lives in a brown-colored environment. Which beans have the most favorable trait for this environment?
The black beans have the most favorable trait because of their color.
The lima beans have the most favorable trait because of their color.
The kidney beans have the most favorable trait because of their color.
All the beans have the most favorable trait for the brown environment.
In a population of fish, the larger fish need more food to survive. In an environment where food can only be found between small spaces in rocks, which fish do you predict will survive?
A
B
C
A population of beans lives in a brown-colored environment. What would happen to the lima beans and black beans over the next few generations?
The number of the lima beans and black beans will decrease.
The number of lima beans will stay the same, while the black beans will increase.
The number of lima beans will increase, while the black beans will decrease.
The number of lima beans will decrease, while the black beans will stay the same.
