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7th Grade Science - Natural Selection and Selective Breeding

Quiz by Carolina Carner

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11 questions
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  • Q1
    The advertisement shown above announces a new type of rose that was most likely produced by
    Question Image
    Changing the environment
    Increasing the amount of light
    Nature over many generations
    Crossing plants with the desired traits
  • Q2
    Crickets communicate with other crickets by chirping. Crickets who cannot make sound are less likely to find a mate and reproduce. For this reason, there are few crickets that cannot make sound. This is an example of
    Selective breeding
    Genetic replication
    Natural selection
    Learned behavior
  • Q3
    Some moths have a brown body and brown wings while other moths have a white body and white wings. The brown moths often rest on the bark of pine trees and the white moths rest on the white bark of aspen trees. If all the aspen trees in an area were cut down, what would be the likely result?
    The white moths will grow brown wings in order to blend in with the environment. Over time, there will be a new type of moth with a white body and brown wings.
    More brown moths will survive than white moths because predators will be able to spot the white moths more easily. Over time, there will be no white moths in the area.
    The white moths will migrate to a new area where aspen trees are found. The brown moths will remain in the original area. The number of brown moths will increase.
  • Q4
    The diagram above illustrates the change that occurred in the frequency of white and spotted bugs in an insect population over 10 generations. A probable explanation for this change would be that
    Question Image
    white bugs were better at escaping predators
    spotted bugs were able to blend in better which allowed them to survive and pass on their traits.
    spotted bugs more easily attracted mates
  • Q5
    A new kind of seed plant has been found on a remote island. This plant has larger, harder seeds than those found on the Galapagos Islands. Which of the following finch adaptations would be likely to arise on this new island?
    Smaller beaks
    Larger beaks
    Shorter legs
    Longer legs
  • Q6
    A population of mice is evenly divided into two groups with the same number of brown mice and gray mice. One group is places on Island A and the other group is placed on Island B. Neither of the islands had a pre-existing mouse population or were influenced by humans. Which statement best explains the difference in the mouse populations on Island A and Island B at the end of the 20 years?
    Question Image
    On Island A, the trait for gray fur was dominant, while on Island B, the trait for brown fur was dominant
    Selective breeding occurred on Island B for brown fur color where as no selective breeding was done on Island A.
    Conditions on Island B allowed for natural selection favoring brown-furred mice, while both fur colors were evenly advantaged on Island A.
  • Q7
    The different species of Hawaiian honeycreepers shown all descended from a single species of North American bird. They now have different beaks, sing different songs, and live in different environments on the islands. Which factor probably contributed most to the development of these different beaks?
    Egg size
  • Q8
    Which graph best illustrates the expected change in the finch population if the environment changes to favor small beaks?
    Question Image
  • Q9
    How might farmers use selective breeding with their crops?
    Farmers remove weeds from their fields so they cannot reproduce.
    Plants that produce larger crops are crossed to produce the next generation.
    Farmers use pesticides to kill insects that prey on their crops.
  • Q10
    Which of the following changes in traits is due to selective breeding
    A population of grasshoppers color changes over time to be closer in color to the grass it lives in
    A population of flowers become larger over time after a new pollinator is introduced to the community
    A herd of cows become skinny over time because of a lack of grass due to drought
    A type of rabbit sold in pet stores is developed by sellers to have longer ears over time because longer ears sell better
  • Q11
    Which of these traits is LEAST likely to show a change when traced through several generations of dogs?
    length of body
    length of hair
    number of legs
    color of fur

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