Q. Consider the following statements:

1. Phytoplankton can be either photosynthetic or chemosynthetic.
2. The two major types of phytoplankton are diatoms and dinoflagellates.
3. Zooplankton and phytoplankton can be found only in fresh water habitats.
4. Zooplankton can be a primary or secondary consumer of an aquatic food chain.

Which of the statements given above are correct?
Answer: Only 1, 2 and 4
Notes: Statements 1, 2, and 4 are correct. Phytoplankton can be either photosynthetic or chemosynthetic, and their two major types are diatoms and dinoflagellates. Zooplankton may serve as primary or secondary consumers in aquatic food chains. Statement 3 is incorrect as both zooplankton and phytoplankton occur in marine as well as freshwater habitats.