As the population continues to grow, more resources are used and more waste is created.
1 Population Impact on the Environment
If these resources are not used wisely and if waste is not managed properly, environmental problems are possible.
1 Section Check Question 1 A. community B. ecosystem C. niche D. population All the individuals of one species occupying a particular area are a(n) __________. NC: 3.06
1 Section Check Answer The answer is D. A population can be of a large or small area. NC: 3.06
1 Section Check Question 2 What does the term “carrying capacity” mean? Answer Carrying capacity is the largest number of individuals of a particular species that the environment can support. NC: 3.08
1 Section Check Question 3 What is the approximate current human population of Earth? A. 600 million B. 1 billion C. 6 billion D. 9 billion NC: 3.08
1 Section Check Answer The answer is C. The current human population of is approximately 6 billion. NC: 3.08
During phytoremediation, roots of certain plants such as alfalfa, grasses, and pine trees can absorb metals, including copper, lead, and zinc from contaminated soil just as they absorb other nutrients.
In many other countries throughout the world, land also is set aside for natural preserves.
2 Using Land
Preserving some land in its natural state will benefit future generations.
2 Section Check Question 1 What is deforestation? Answer Deforestation is the clearing of forested land for agriculture or industry. NC: 3.06
2 Section Check Question 2 What is a primary benefit of farming practices such as no-till farming and contour plowing? Answer These practices reduce soil loss. Other techniques used to reduce soil erosion are planting cover crops and rows of trees along fields. NC: 3.06, 3.07, 3.08
2 Section Check Question 3 __________ is the volume of water flowing past a point per unit of time. A. Pollution B. Rainfall C. Runoff D. Stream discharge NC: 3.01
2 Section Check Answer The answer is D. A stream’s discharge increases when more water enters its channel. NC: 3.01
It's unlikely that the population will begin to decline in the near future.
3 Conserving Resources
To make up for this, resources must be used wisely.
Conserving resources by reducing, reusing, and recycling is an important way that you can make a difference.
3 Section Check Question 1 Piling yard wastes where they can decompose gradually is __________. A. composting B. mulching C. recycling D. reusing NC: 3.06, 3.08
3 Section Check Answer The answer is A. Composting can greatly reduce the amount of trash put in landfills. NC: 3.06, 3.08
3 Section Check Question 2 What is conservation? Answer Conservation is the careful use of earth materials to reduce damage to the environment. NC: 3.06, 3.08
3 Section Check Question 3 Using materials again is called __________. A. composting B. conservation C. preservation D. recycling NC: 3.06, 3.08
3 Section Check Answer The answer is D. Recycling has helped to decrease the amount of trash put into landfills. NC: 3.06, 3.08
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