Question

Upper part of sea/aquatic ecosystem contains:

• A. Planktons
• B. Nektons
• C. Both
• D. Benthos

Answer 1

The correct option is C

Both

The correct option is C.

Explanation of the correct option:

1. Planktons are a set of unicellular organisms that consist of photosynthetic algae and form the first strata of the aquatic food chain.
2. Planktons are free-floating and move along with the water current.
3. Nektons are aquatic animals that can be capable of swim and passing independently of water currents.
4. Planktons and nektons are found in the upper part of an aquatic ecosystem since it is the sun-lit zone that is preferred by them.

Explanation of the incorrect options:

Option A:

Upper part of the sea/aquatic ecosystem contains nektons along with planktons.

Option B:

Upper part of the sea/aquatic ecosystem contains planktons along with nektons.

Option D:

Benthos are organisms that are present at the lowest strata of the water bodies.

Final answer: Upper part of the sea/aquatic ecosystem contains planktons and nektons both.