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What term is used to describe the lower portion of the photic zone?

A. benthic zone
B. aphotic zone
C. transition zone
D. abyssal zone

Answer :

The lower portion of the photic zone is called the transition zone.

Option C is answer.

The photic zone is the uppermost layer of the ocean, which receives sufficient sunlight for photosynthesis to occur. The photic zone is divided into two sub-zones: the epipelagic zone and the mesopelagic zone. The epipelagic zone is the uppermost layer, which receives the most sunlight, while the mesopelagic zone is the lower layer, which receives less sunlight.

The transition zone is the lower portion of the photic zone, which is located between the mesopelagic zone and the bathypelagic zone. It is called the transition zone because it is the area where the water transitions from being able to support photosynthesis to being too dark for photosynthesis to occur. The transition zone is also known as the twilight zone, as it is the area where sunlight is still visible but not strong enough to support photosynthesis.

The correct answer is option C: transition zone.

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