Question

What is Plankton?
A. Microscopic floating organisms – Plants and Animals
B. Bottom dwelling aquatic organisms
C. Large plants in water
D. None of the above

Answer 1

Hint: Aquatic animals are classified based on their habits like whether they are free floating, active swimmers or bottom dwellers. into three broad categories namely - the planktons, nektons and benthos. The former are found to be the producers and primary consumers of the aquatic ecosystem. Usually, the plankton are the most abundant organisms of aquatic habitats.

Completely answer:
Option A: Planktons are free floating microorganisms and are divided into two types namely Phytoplanktons which comprises of photosynthetic bacteria and algae and zooplanktons which comprises of microscopic animals and their larvae which feed on Phytoplanktons.
Thus, Option A is correct.
Option B: Bottom dwelling aquatic organisms are known as benthos and hence this option is eliminated. These organisms are found in the littoral region and floor of the aquatic habitat. Examples include mussels, crabs, lobsters, prawns etc.
Thus, Option B is not correct.
Option C: Large plants in water are known as hydrophytes and not plankton.
Thus, Option C is also incorrect.
Option D: None, this cannot be the correct answer.
Thus, Option-D is also not correct.

Therefore, Option A. Microscopic floating organisms – Plants and Animals is the correct answer

Note:
The word “plankton” comes from the Greek and means “drifter” or “wanderer.” An organism is taken into consideration plankton if its miles are carried through tides and currents, and cannot swim nicely sufficient to transport towards those forces. Some plankton glide this manner for his or her whole lifestyles cycle. Others are simplest categorized as plankton while they're young, however they subsequently develop huge sufficient to swim towards the currents.