Question

Which of the following groups of organisms are considered zooplankton? Choose all that apply.

a. Phytoplankton.
b. Jellyfish.
c. Krill.
d. Algae.

Answer 1

Zooplankton includes tiny, often microscopic animals such as jellyfish (in their larval stage) and krill. Phytoplankton and algae are not zooplankton; they are producers that perform photosynthesis and serve as a food source for zooplankton within the food web.

Step-by-step explanation:

The groups of organisms considered zooplankton include any type of small or microscopic animals that float or drift in water, especially the ocean. They are a key part of the food web and play an essential role in aquatic ecosystems. From the choices given:

b. Jellyfish – Some jellyfish are considered zooplankton during their larval stage, as they drift along in the plankton.

c. Krill – Krill are small crustaceans found in the ocean and are a well-known type of zooplankton that form large swarms and serve as an important food source for larger animals like salmon.

The other options given, like phytoplankton and algae, are not zooplankton. Phytoplankton are photosynthetic organisms and, unlike zooplankton, they produce their own food through photosynthesis. Algae, similar to phytoplankton, are mostly autotrophic and provide a food source for zooplankton.