Which of the following type of aquatic organism is not correctly matched with its definition 1...........

Geography and Environment Concept of Ecology

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Which of the following type of aquatic organism is not correctly matched with its definition?

1. Plankton - Microscopic plants and animals.

2. Nekton - Animals which can swim

3. Neuston - Organisms found on the bottom of the water body.

4. Benthos - Floating organisms inhabiting the surface layer

Select the correct answer using the code given below.

1 and 2 only

3 and 4 only

1,2 and 4

1, 2, 3 and 4

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Explanation:

Based on the their life form or location, aquatic organisms (both flora and fauna) are classified into five groups:

o Neustons: Unattached organisms which live at air-water interface such as floating plants etc.

o Periphytons: There are organisms which remain attached to stems and leaves of rooted plants or substances emerging above the bottom mud such as sessile algae.
o Planktons: These are free floating species with limited powers of locomotion. This group includes microscopic plants like algae (phytoplankton) and animals like crustaceans and protozoans (zooplankton).

o Nektons: This group includes animals which are swimmers. The animals range in size from the swimming insects to the largest animals, blue whale.

o Benthos: These are found living in the bottom of the water mass.