Water Zones - GS questions based on daily current affairs

1)   Which of the following are zones in open oceans?

1) Benthic
2) Euphotic
3) Abyssal
4) Bathyal

a. 1, 2 and 4
b. 1, 2 and 3
c. 2, 3 and 4
d. All of the above
Answer  Explanation 

ANSWER: 2, 3 and 4

Explanation:
There enough light in the Euphotic zone for photosynthesis. Bathyal zone lacks sunlight. Abyssal zone is cold and dark zone at the bottom. Lacks sunlight yet there are producers at such depth. They are bacteria which can withstand temperatures of 200°C and they produce food through chemical reaction.
2)   Which of the following is the correct arrangement of zones in a lake as per increasing depth of the zones?

a. Littoral – Limnetic – Benthic - Profundal
b. Profundal– Littoral – Limnetic - Benthic
c. Littoral – Limnetic – Profundal - Benthic
d. Littoral – Profundal – Limnetic - Benthic
Answer  Explanation 

ANSWER: Littoral – Limnetic – Profundal - Benthic

Explanation:
Peripheral zone (littoral zone) with shallow water and most of the vegetation. Open water beyond the littoral zone is limnetic zone. It extends down as far as sunlight penetrates to permit photosynthesis. Profundal zone is where water is quite deep and it’s too dark for photosynthesis. Bentic zone (bottom) is the floor of the lake.

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