Question

Which of the following statements is/are correct?


1. Unlike in the photic zone where both photosynthesis and respiration occur, only respiration takes place in the aphotic zone.
2. The profundal zone lies between photic and the aphotic zones.


Select the correct answer using the options given below:

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2​

Answer 1

Answer:

D)Neither 1 nor 2

Explanation:

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Answer 2

Option A - 1 Only

More Information

☆  Photic zone :-

• It is the upper layer of the aquatic ecosystems, up to which light penetrates and within which photosynthetic activity is confined.

• The depth of this zone depends on the transparency of water.

• Both photosynthesis and respiration activity takes place.

• The photic (or “euphotic”) zone is the lighted and usually well-mixed portion that extends from the lake surface down to where the light level is 1% of that at the surface.

☆  Aphotic zone :-

• The lower layers of the aquatic ecosystems, where light penetration and plant growth are restricted forms the aphotic zone.

• Only respiration activity takes place.

• The aphotic zone is positioned below the littoral and photic zones to the bottom of the lake where light levels are too low for photosynthesis. Respiration occurs at all depths so the aphotic zone is a region of oxygen consumption.

• This deep, unlit region is also known as the profundal zone.