Question

Comprehension Selective breeding, also known as artificial selection, is the process by which humans choose specific organisms to reproduce based on desired traits. This practice has been used for thousands of years to improve crops, livestock, and even pets. By choosing parents with favorable characteristics, such as higher milk production in cows or sweeter fruit in plants, humans can influence the traits seen in future generations. Unlike natural selection, where environmental pressures determine which organisms survive and reproduce, selective breeding relies entirely on human choice. One of the earliest uses of selective breeding can be traced back to early farmers who noticed that some plants produced larger harvests. They saved the seeds from these productive plants and planted them again. Over time, crops became more reliable and provided more food. Similarly, early livestock breeders selected animals that were stronger, healthier, or better suited for work. This led to stronger horses, woollier sheep, and more efficient farm animals. While selective breeding has many benefits, it also has some drawbacks. Because the chosen parents often have very similar genetic material, selective breeding can reduce genetic diversity. This makes populations more vulnerable to diseases or environmental changes. For example, certain dog breeds suffer from health issues due to generations of breeding for physical appearance rather than overall health. Despite these challenges, selective breeding remains an important tool in agriculture and science, allowing humans to develop organisms with traits that support food production, research, and daily life. Selective Breeding Multiple Choice Questions
23. What do humans select for in selective breeding?
A. Undesirable traits
B. Desired traits
C. Random traits
D. Natural traits

24. Selective breeding has been used for how long?
A. Hundreds of years
B. Thousands of years
C. Tens of years
D. Millions of years

25. Which is an example of a selected trait?
A. Color change
B. Sweeter fruit
C. Camouflage
D. Ability to fly

26. Selective breeding differs from natural selection because it relies on:
A. Predators
B. Climate
C. Human choice
D. Luck

27. Early farmers improved crops by selecting seeds from:
A. Average plants
B. Least productive plants
C. Most productive plants
D. Random plants

28. Livestock breeders selected animals that were:
A. Weaker
B. Stronger
C. Slower
D. Smaller

29. A benefit of selective breeding is:
A. Reduced food production
B. Improved traits
C. Reduced crop size
D. Less reliable livestock

30. A drawback of selective breeding is reduced:
A. Strength
B. Genetic diversity
C. Food quality
D. Reproduction rate

31. What is selective breeding?
A. Natural evolution
B. Human choice of traits
C. Random mating
D. Environmental pressure

32. What is another name for selective breeding?
A. Natural selection
B. Artificial selection
C. Evolution
D. Mutation

33. What do humans select for in selective breeding?
A. Undesirable traits
B. Desired traits
C. Random traits
D. Natural traits

34. Selective breeding has been used for how long?
A. Hundreds of years
B. Thousands of years
C. Tens of years
D. Millions of years

35. Which is an example of a selected trait?
A. Color change
B. Sweeter fruit
C. Camouflage
D. Ability to fly

36. Selective breeding differs from natural selection because it relies on:
A. Predators
B. Climate
C. Human choice
D. Luck

37. Early farmers improved crops by selecting seeds from:
A. Average plants
B. Least productive plants
C. Most productive plants
D. Random plants

38. Livestock breeders selected animals that were:
A. Weaker
B. Stronger
C. Slower
D. Smaller

39. A benefit of selective breeding is:
A. Reduced food production
B. Improved traits
C. Reduced crop size
D. Less reliable livestock

40. A drawback of selective breeding is reduced:
A. Strength
B. Genetic diversity
C. Food quality
D. Reproduction rate

Answer 1

23. B — Desired traits
24. B — Thousands of years
25. B — Sweeter fruit
26. C — Human choice
27. C — Most productive plants
28. B — Stronger
29. B — Improved traits
30. B — Genetic diversity
31. B — Human choice of traits
32. B — Artificial selection
33. B — Desired traits
34. B — Thousands of years
35. B — Sweeter fruit
36. C — Human choice
37. C — Most productive plants
38. B — Stronger
39. B — Improved traits
40. B — Genetic diversity