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TX PACT Science 4 to 8 (716) Practice Tests & Test Prep by Exam Edge


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TX PACT Science Grade 4 to 8 Sample Test

1 of 5

Which of the following term and quotation examples is consistent with Darwin’s Theory of Evolution?

Correct Answer:
"survival of the fittest" – stronger lions will reproduce, and weaker lions will not have mates.


the term "survival of the fittest," which is often associated with charles darwin's theory of evolution, encapsulates the idea that in nature, the individuals best adapted to their environment are more likely to survive and reproduce. darwin's theory, more formally known as natural selection, suggests that over time, the traits that help organisms survive and reproduce become more common in a population. this evolutionary process leads to changes in the traits of populations over generations, which can eventually lead to the emergence of new species.

the example of stronger lions reproducing while weaker lions fail to find mates illustrates natural selection effectively. lions that are physically stronger or more adept at surviving in their environment - perhaps through superior hunting skills or greater strength - are more likely to win mating opportunities. this selective breeding ensures that the genes associated with stronger attributes are passed on to the next generation, potentially making each subsequent generation better adapted to their environment. weaker lions, on the other hand, are less likely to reproduce, meaning their genes are less likely to be passed on. this process gradually shifts the genetic makeup of the lion population.

it's important to clarify that "survival of the fittest" does not necessarily mean the strongest physically, but rather the best fit for the environment, including various factors such as behavior, physical traits, and even psychological traits that enhance an organism's survival and reproductive success. for instance, in some scenarios, being smaller or more cooperative could be advantages that would fit the definition of "fittest."

this concept is distinct from other evolutionary ideas and misconceptions such as "acquired characteristics can be inherited," which was proposed by jean-baptiste lamarck. lamarck's theory suggested that traits acquired during an organism's lifetime could be passed on to its offspring, a concept not supported by darwinian evolution or modern genetics. for example, the notion that giraffes have long necks because their ancestors stretched their necks to reach higher leaves does not align with darwinian principles. instead, darwin would argue that giraffes with naturally longer necks were more likely to survive and reproduce because they could access food sources unavailable to shorter-necked giraffes.

similarly, other theories like catastrophism, which posits that sudden, short-lived, violent events, like natural disasters, are primarily responsible for geological changes and the extinction of species, do not align with darwin's gradualist view of steady evolutionary change through natural selection. uniformitarianism, which suggests that the forces affecting the earth and its life forms have been consistent over time, aligns more closely with darwinian thought but focuses more on geological rather than biological evolution.

in conclusion, darwin's theory of evolution by natural selection provides a robust framework for understanding how species change over time due to pressures from their environment. the example of stronger lions being more likely to reproduce is a clear illustration of this theory, emphasizing that evolutionary success is about reproductive success and the passing on of advantageous traits to future generations.
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TX PACT Science Grade 4 to 8 Exam Blueprint

Understanding the exact breakdown of the TX PACT Science Grade 4 to 8 test will help you know what to expect and how to most effectively prepare. The TX PACT Science Grade 4 to 8 has 125 multiple-choice questions The exam will be broken down into the sections below:

TX PACT Science Grade 4 to 8 Exam Blueprint
Domain Name % Number of
Questions
Nature of Science 19% 24
Physical Science 31% 39
Life Science 25% 31
Earth and Space Science 25% 31