Q. Consider the following statements regarding aquatic organisms:
1.Neuston includes both organisms that live on top of the air-water interface and those just beneath it.
2.Nekton comprises mostly microscopic organisms whose movement is governed by water currents.
3.Benthos are organisms that live at the bottom of water bodies and are found in almost all aquatic ecosystems.
How many of the above statements are correct?
Answer: B
Notes:
Explanation:
- Neuston includes organisms that live at or near the air-water interface. Some live on top (like water striders), while others live just beneath (like beetles and back-swimmers).
- This describes plankton, not nekton. Nekton are strong swimmers, ranging from insects to whales, and are capable of overcoming water currents.
- Benthos refers to organisms that live at the bottom of aquatic ecosystems. They are indeed found in almost all such ecosystems.
Source: Environment (N.C.E.R.T)
