Question

1. how do pollutants typically affect marine food webs? a) they improve the health of marine organisms b) they accumulate in the tissues of organisms c) they have no impact on the food web d) they increase the population of primary producers 7. what phenomenon caused by climate change can significantly impact coral reefs? a) ocean warming b) decreased nutrient availability c) increased fish populations d) lower oxygen levels 8. what is the role of decomposers in a marine food web? a) to consume primary producers b) to act as top predators c) to compete with primary consumers d) to break down dead organic matter and recycle nutrients 9. in the north sea cod fishery case study, what was a significant effect of the cod population collapse? a) increased cod reproduction rates b) decline in smaller fish populations c) overpopulation of sprat and herring d) restoration of phytoplankton levels 10. what management strategy was implemented in response to the collapse of the north sea cod fishery? a) increased fishing quotas b) closing certain fishing areas c) allowing unrestricted fishing d) ignoring the problem entirely

Explanation:

• Question 6: Pollutants bio - accumulate in the tissues of organisms through the food web. They do not improve health, have an impact, and do not increase primary producer populations.
• Question 7: Ocean warming due to climate change causes coral bleaching and significantly impacts coral reefs. Other factors are not the main climate - change related impact on coral reefs.
• Question 8: Decomposers break down dead organic matter and recycle nutrients in a food web. They do not consume primary producers, act as top predators, or compete mainly with primary consumers.
• Question 9: When cod population collapses, their prey (such as sprat and herring) may overpopulate as there is less predation pressure.
• Question 10: Closing certain fishing areas is a common management strategy to allow fish populations to recover. Increasing quotas, unrestricted fishing, or ignoring the problem would be counter - productive.

Answer:

1. b) They accumulate in the tissues of organisms
2. a) Ocean warming
3. d) To break down dead organic matter and recycle nutrients
4. c) Overpopulation of sprat and herring
5. b) Closing certain fishing areas