College

**Chapter Test B: Food and Agriculture**

**11. DDT is harmful to the environment because:**

a. it does not break down quickly into harmless chemicals.
b. it concentrates in the bodies of animals high in the food chain.
c. it causes some birds to lay eggs with shells so thin that they break when the birds sit on them.
d. All of the above

**12. Which of the following farm practices has been used by farmers only in recent years?**

a. fertilizing crops
b. irrigation
c. pest control
d. none of the above

**13. When a farmer uses no-till farming methods:**

a. seeds are planted among the roots of the previous crop.
b. more erosion is likely.
c. only organic fertilizers are used.
d. All of the above

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

a. Food production has not been increasing as fast as the human population, and it is difficult to distribute food to everyone who needs it.
b. There is plenty of food produced for everyone to have more than enough, but it is not distributed equally.
c. In recent years, the human population has been growing, but food production has been falling.
d. Throughout human history, many people have not had enough to eat, but new farming methods mean that this will not be a problem in the next century.

**COMPLETION**

Fill in the missing word or phrase that best completes the following statements.

15. A modern method of controlling pests reduces but does not completely eliminate pest populations.
16. The technology of __________ allows desirable traits in crop plants to be passed on through the direct transfer of genes for those traits.
17. No-fishing zones are created as an effort to reduce the effects of __________.
18. __________ is raising aquatic organisms for human use and consumption.
19. Cattle, goats, pigs, sheep, and chickens are all types of __________.
20. __________ animal species are those bred and managed for human use.

Answer :

Final answer:

DDT is harmful due to its persistence in the environment and detrimental effects on wildlife. Modern agricultural practices like no-till farming and genetic engineering play significant roles in food production and pest management. Food distribution challenges contribute to global hunger despite sufficient production levels.


Explanation:

Impact of DDT and Agricultural Practices

DDT, or dichloro-diphenyl-trichloroethanol, is a pesticide that has been widely recognized for its harmful effects on the environment. The answer to question 11 is d. All of the above because:

  • a. It does not break down quickly into harmless chemicals, persisting in the environment for years.
  • b. It concentrates in the bodies of animals high in the food chain, a process known as biomagnification.
  • c. It causes some birds to lay eggs with shells so thin that they break under the weight of the parent, leading to population declines.

In question 12, the correct answer is d. none of the above as all mentioned practices have been used for centuries, though modern techniques have evolved over time.

Question 13 identifies a no-till farming method. The correct option is a. seeds are planted among the roots of the previous crop, which helps retain soil structure and reduce erosion compared to traditional plowing.

Regarding hunger in the world, the answer to question 14 is a. Food production has not been increasing as fast as the human population, and it is difficult to distribute food to everyone who needs it. This highlights the complexity of food security.

In question 15, a modern method of pest control that reduces populations is referred to as integrated pest management (IPM).

For question 16, the technology of genetic engineering allows desirable traits in crop plants to be passed on through direct gene transfer. This advances food production efficiency.

Question 17 discusses overfishing, as no-fishing zones are established to protect marine life. Protecting ecosystems is crucial for maintaining biodiversity.

Finally, question 19 refers to livestock, which includes cattle, goats, pigs, sheep, and chickens, all of which are raised for human use.


Learn more about Environmental Impact of Agriculture here:

https://brainly.com/question/23255509


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