Ocean Zones and Conditions

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What is the primary reason for the high content of dissolved oxygen in the sunlight zone?

High rate of photosynthesis by producers.

How do organisms in the midnight zone adapt to the high pressure?

They do not need adaptations for high pressure.

What type of organisms are phytoplankton, and what do they include?

Microscopic producers, including diatoms, dinoflagellates, and cyanobacteria.

What is the primary difference in temperature between the midnight zone and the twilight zone?

The midnight zone has variable temperature, while the twilight zone has stable temperature. Signup and view all the answers

Why is there a lower biomass in the twilight zone compared to the sunlight zone?

There is lower light availability, resulting in fewer producers and less energy for higher trophic levels. Signup and view all the answers

What is the primary reason for vertical migration in the sunlight zone?

Breeding and finding food. Signup and view all the answers

What is the primary reason why deep-sea species in the midnight zone migrate to the twilight zone during the day?

To get away from predators Signup and view all the answers

How do some fish species in the midnight zone prevent prey from escaping once caught?

With large backward-facing teeth Signup and view all the answers

What is the main reason for the lack of producers in the midnight zone?

No light, therefore no photosynthesis Signup and view all the answers

What adaptation helps deep-sea species blend in with their surroundings, making it difficult for predators to spot them?

Counter-shading (dark on top, light-colored below) Signup and view all the answers

Why do deep-sea species in the midnight zone tend to have slow movements and long lifespans?

Due to low oxygen and low temperature Signup and view all the answers

What is the primary function of bioluminescence in deep-sea species?

To attract mates or prey, or to illuminate predators Signup and view all the answers

What is the primary reason for the lack of nutrients in coastal ecosystems, hindering the growth of a population?

Lack of nutrients prevents a population growing rapidly. Signup and view all the answers

How do coastal ecosystems differ from open-ocean ecosystems in terms of productivity?

Coastal ecosystems generally have a higher productivity than the open-ocean ecosystem. Signup and view all the answers

What is the effect of competition on population growth in coastal ecosystems?

Population growth decreases when there is a competition between organisms. Signup and view all the answers

What is the significance of the sunlight zone in the open-ocean ecosystem?

The region of the ocean between 0m and 200m depth. Signup and view all the answers

How do diseases affect population growth in coastal ecosystems?

Diseases decrease the population growth. Signup and view all the answers

What is the primary characteristic of benthic zones in the open-ocean ecosystem?

The area of seabed. Signup and view all the answers