Question 1 A) Which is most likely a keystone species?

Question

Answer: wolves in Yellowstone National Park, which eat elk, who graze on willows, on which beavers depend to build their dams

Question 2 A) Environmental changes like increased temperature can stress an ecosystem. Why is this an issue with regard to invasive species?
Answer: Invasive species thrive in stressed ecosystems like those with warmer temperatures.

Question 3 A) Direct ecosystem services include benefits such as
Answer: recreational parks.

Question 4 A) What is the definition of ecological resistance?
Answer: an ecosystem’s ability to endure in changing conditions

Question 5 A) Which ecosystem service do decomposers provide?
Answer: nutrient cycling

Question 6 A) Which statement is true?
Answer: Composting speeds up the decomposition of organic material.

Question 7 A) How do traditional food production practices contribute to a reduction in biodiversity?
Answer: Land that is converted to agriculture is no longer a suitable habitat for native species.

Question 8 A) Which option would be the best way to reuse food waste?
Answer: compost scraps for fertilizer

Question 9 A) The Northern Pacific seastar is a particularly successful invasive species. Which of the following explains why it is so successful in the waters of southeastern Australia, outside of its native environment?
Answer: It breeds rapidly and has no predators in this environment.

Question 10 A) Aside from killing native species, what other negative issue might an invasive species present?
Answer: They might introduce other organisms, like viruses and bacteria.

Question 11 A) What happens after coral is bleached?
Answer: The coral is susceptible to starvation.

Question 12 A) The most biodiverse ecosystem in the world is likely a
Answer: coral reef.

Question 13 A) What term best describes the otter in the Aleutian Islands ecosystem?
Answer: keystone species

Question 14 A) “Green” material has high amounts of
Answer: nitrogen.

Question 15 A) What aspect of an organism makes it an invasive species?
Answer: It does harm and is introduced to the ecosystem.

Question 16 A) Which of the following additional characteristics of the Kudzu vine determined that it was an invasive species?
Answer: it grows rapidly, robbing other plants of sunlight.

Question 17 A) Why are invasive species such a huge threat to ecosystems?
Answer: Invasive species can do intense damage, so much so that ecosystems may not be able to recover.

Question 18 A) Select the animal whose absence would have the greatest negative effect on the ecosystem.
Answer: wolf

Question 19 A) In an ecosystem with low biodiversity, the removal of a species will
Answer: disturb the ecosystem because another species will not be able to replace it.

Question 20 A) Biodiversity is measured by
Answer: counting the number and variation of different species of plants, animals, and other organisms that interact within an ecosystem.
Are all of these true or false?

Answer 1

Based on the answers provided, here’s a summary of whether each statement is true or false:

1. True - Wolves in Yellowstone are considered a keystone species due to their role in regulating elk populations which impacts other species like willows and beavers.

2. True - Increased temperature can stress ecosystems, allowing invasive species to thrive.

3. True - Recreational parks are considered direct ecosystem services.

4. True - Ecological resistance refers to an ecosystem’s ability to endure in changing conditions.

5. True - Decomposers provide the ecosystem service of nutrient cycling.

6. True - Composting can speed up the decomposition of organic material.

7. True - Converting land to agriculture reduces habitat availability for native species.

8. True - Composting food scraps is a beneficial way to reuse food waste.

9. True - The Northern Pacific seastar is successful as it breeds rapidly and lacks predators in the new environment.

10. True - Invasive species can introduce other harmful organisms such as viruses and bacteria.

11. True - After coral is bleached, it is indeed susceptible to starvation.

12. True - Coral reefs are considered the most biodiverse ecosystems.

13. True - Otters in the Aleutian Islands are regarded as a keystone species.

14. True - "Green" material in composting typically has high amounts of nitrogen.

15. True - An invasive species is defined by its potential to harm the ecosystem where it has been introduced.

16. True - Kudzu's rapid growth and solar competition are characteristics that make it invasive.

17. True - Invasive species can cause significant damage to ecosystems, hindering recovery.

18. True - The absence of wolves would likely have a significant negative effect on their ecosystem.

19. True - Removing a species from an ecosystem with low biodiversity can cause significant disturbances.

20. True - Biodiversity is measured by counting and analyzing the number and variation of different species in an ecosystem.

All the statements are true.