Lecture 3

Front

What is the twilight zone in the ocean?

Back

The twilight zone, also known as the mesopelagic zone, is the layer of the ocean between 200 meters and 1000 meters deep, where light begins to fade and photosynthesis is not possible.

Front

In which oceanic zone are red organisms primarily visible?

Back

Red organisms are primarily visible in the euphotic zone, where there is sufficient light for photosynthesis.

Front

What are pelagic zones based on?

Back

Pelagic zones are based on depth, which influences light penetration and the types of organisms that can inhabit those zones.

Front

Define the euphotic zone.

Back

The euphotic zone is the upper layer of the ocean where sunlight penetrates, allowing photosynthesis to occur, typically extending to about 200 meters.

Front

What characterizes the aphotic zone?

Back

The aphotic zone is the part of the ocean where there is no light, typically found below 1000 meters, making photosynthesis impossible.

Front

What is the abyssopelagic zone?

Back

The abyssopelagic zone is the deep ocean layer that ranges from 4000 meters to 6000 meters, characterized by complete darkness and high pressure.

Front

Explain the significance of light penetration in ocean zones.

Back

Light penetration is crucial as it determines the types of organisms that can live in each zone, influencing the entire marine ecosystem.

Front

What is the depth range of the mesopelagic zone?

Back

The mesopelagic zone ranges from 200 meters to 1000 meters deep.

Front

How does the depth affect marine life in the pelagic zones?

Back

Depth affects marine life by influencing light availability, temperature, and pressure, which in turn affects the types of species that can survive.

Front

What is the bathypelagic zone?

Back

The bathypelagic zone is the layer of the ocean that extends from 1000 meters to 4000 meters, characterized by darkness and cold temperatures.