Question

Which of the following statements about the effects of agricultural techniques on the environment is true? a. Fertilizer used for agriculture can enter bodies of water, causing eventual oxygen depletion. b. Pesticides and herbicides are potentially harmful to bodies of water only before they degrade. c. Agricultural practices have limited impact on the surrounding environment. d. Tillage is an important agricultural practice that has no known environmental impact.

Answer 1

Answer: The correct response is A. Fertilizer used in agriculture can enter the surrounding water bodies and cause oxygen depletion.

Explanation:

Fertilizers, when entering water bodies, induce additional nutrients into the water making it enriched in dissolved nutrients , e.g., phosphates, and stimulating the overgrowth of aquatic flora.

This process known as eutrophication is known to cause a decrease in the dissolved oxygen in the water body.

Overgrowth of algae and algal blooms over the surface of water blocks sunlight penetrating the affected lake or pond. Also, these overgrowths prevent oxygen from getting into water, hence making it hypoxic (little or no oxygen content), and all the aquatic diversity dies as a result.

Answer 2

Fertilizer used for agriculture can use bodies of water causing eventual depletion of oxygen – This statement is true.

Option a.

Explanation:

• Fertilizers have tremendously harmful effects on the environment when used in abundance and this is common knowledge. However, fertilizers do have indirect effects on the environment too.
• When nitrogen-based or Sulphur based fertilizers are put to soils when it rains, these fertilizing compounds often get washed up and get drained to the nearby water bodies.
• There these fertilizers along with phosphorus-based fertilizers use up the soluble oxygen of water and thus creating difficulty for the marine life.

Learn more about Fertilizers:

What is fertilizer? name any two fertilizers. state two harmful effects caused by the excessive use of fertilizer

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A farmer was advised not to use a particular type of fertilizer for his crop and harvesting a crop of peas give one reason for such an advice name any two crops other than pea crop which might have shown the same effect

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