Question

As DDT (or other persistent chemical that can biomagnifiy) moves up the trophic level in food chains, or food webs, its concentration ____. a increases b stays the same c is eliminated d decreases Question 5 Conservation is the practice of using fewer natural resources and reducing waste. Conservation practices are helpful by a slowing population growth. b preventing habitat destruction and by reducing pollution. c decreasing biodiversity. d decreasing the spread of exotic species and by creating new habitats. Question 6 Which of the following is being done to reduce the concentration of greenhouse gases in the atmosphere? a the reduction of fertilizer and pesticide use on farms b an increases in the usage of desalination plants c the production of hybrid cars that use less gasoline d a reduction in the usage of nuclear power Question 7 What are the two major life processes that involve carbon and oxygen? a photosynthesis and respiration b coal formation and photosynthesis c fuel combustion and open burning d death and decay Question 8 There are only about 100 Florida panthers living in the wild. Which of the following is NOT a reason why the Florida panther has become endangered? a They cannot handle the changes in temperature due to global warming. b They require a large habitat in order to survive. c They do not reproduce well in captive breeding programs. d Much of their habitat has been destroyed.

Answer 1

Here are the answers to your questions:

**Question 4:** As DDT (or other persistent chemicals that can biomagnify) moves up the trophic levels in food chains or food webs, its concentration **a increases**. This process is known as biomagnification, where the concentration of toxic substances increases at higher levels of the food chain.

**Question 5:** Conservation practices are helpful by **b preventing habitat destruction and by reducing pollution**. Conservation focuses on the sustainable management of natural resources to protect ecosystems and biodiversity.

**Question 6:** One action being done to reduce the concentration of greenhouse gases in the atmosphere is **c the production of hybrid cars that use less gasoline**. Hybrid cars are more fuel-efficient and emit fewer greenhouse gases compared to traditional gasoline-powered vehicles.

**Question 7:** The two major life processes that involve carbon and oxygen are **a photosynthesis and respiration**. Photosynthesis absorbs carbon dioxide and releases oxygen, while respiration uses oxygen and releases carbon dioxide.

**Question 8:** The statement that is NOT a reason why the Florida panther has become endangered is **a They cannot handle the changes in temperature due to global warming**. While climate change may affect species, the more direct reasons for the Florida panther's endangerment include habitat destruction, low reproductive rates in captivity, and the need for large territories, rather than their inability to cope with temperature changes.