Question: Which of the following farm practices have been used by farmers only in recent years?

1. fertilizing crops

2. b. irrigation

3. c. pest control

4. d. None of the above

5. Answer: none of the above

6. Question: Farmland may become desertified if

7. a. domestic animals are allowed to overgraze the land.

8. b. too many crops are grown on the land and the land gradually loses its fertility.

9. c. as a result of erosion, there is no fertile soil left to grow plants.

10. d. All of the above

11. Answer: all of the above

12. Question: Land where it is possible to grow crops is called

13. Answer: arable land

14. Question: Which of the following best describes why many people in the world go hungry?

15. Answer: Food production has not been increasing as fast as the human population.

16. Question: Which of the following actions contributes to soil erosion?

17. Answer: driving farm machinery over fields

18. Question: Which of the following agricultural products requires the least amount of energy?

19. Answer: wheat

20. Question: When a farmer uses no-till farming methods,

21. Answer: seeds are planted among the roots of the previous crop.

22. Question: One potential way to deal with the problem of seafood overharvesting is by intensifying _____ efforts.

23. Answer: aquaculture

24. Question: Which of the following is a good way to reduce salinization?

25. Answer: using rainwater instead of groundwater on crops

26. Question: DDT is harmful to the environment because it

27. a. does not break down quickly into harmless chemicals.

28. b. concentrates in the bodies of animals high in the food chain.

29. c. causes some birds to lay eggs so thin that they break when the birds sit on them.

30. d. All of the above

31. Answer: all of the above