The correct answer is A. Microscopic floating organisms – Plants and animals.
Plankton are tiny organisms that live in the water. They are too small to swim against the current, so they float or drift with the water. Plankton are important because they are a food source for many larger animals, including fish, whales, and birds.
There are two main types of plankton: phytoplankton and zooplankton. Phytoplankton are plant-like plankton, and they make their own food through photosynthesis. Zooplankton are animal-like plankton, and they eat other plankton or small animals.
Plankton are found in all types of water, including oceans, lakes, and rivers. They are an important part of the food web, and they play a role in the cycling of nutrients in the environment.
Here is a brief explanation of each option:
- Option A: Microscopic floating organisms – Plants and animals. This is the correct answer. Plankton are tiny organisms that live in the water. They are too small to swim against the current, so they float or drift with the water. Plankton are important because they are a food source for many larger animals, including fish, whales, and birds.
- Option B: bottom dwelling aquatic organisms. This is not the correct answer. Plankton are not bottom dwelling organisms. They are floating organisms.
- Option C: large plants in water. This is not the correct answer. Plankton are not large plants. They are tiny organisms.
- Option D: none. This is not the correct answer. Option A is the correct answer.