Consider the following statements regarding Photic and Aphotic Zone of aquatic ecosystem 1 Photic Zo...........

General Studies ( Prelim) Environment and Ecology

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Consider the following statements regarding Photic and Aphotic Zone of aquatic ecosystem:

1. Photic Zone is the upper layer of the aquatic ecosystems

2. Only photosynthesis takes place in the photic zone.

3. Aphotic zone is a region of oxygen consumption.

Which of the above statements are correct?

1 and 2 only

2 and 3 only

1 and 3 only

1, 2 and 3

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Explanation:

Explanation: Statement 2 is incorrect: Both photosynthesis and respiration takes place in the photic zone. Supplementary notes: Photic zone: It is the upper layer of the aquatic ecosystems, up to which light penetrates and within which photosynthetic activity is con fi ned. The depth of this zone depends on the transparency of water. Both photosynthesis and respiration activity takes place. 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 form the aphotic zone. Only respiration activity takes place. Aphotic zone is positioned below the littoral and photic zones to 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.