Protists: Plant-like Protists

The video tutorial explores the role of phytoplankton in Earth's oceans, highlighting their contribution to the food chain and oxygen supply. It explains how these microscopic plants, also known as algae, produce food through photosynthesis. The tutorial also distinguishes between unicellular and multicellular algae, introducing six main groups of algae.

What is the primary role of phytoplankton in aquatic ecosystems?

• They are parasites.

• They decompose organic matter.

• They form the base of the food chain.

• They are top predators.

How much of the world's oxygen is contributed by phytoplankton?

• Almost all

• Over half

• About a third

• Less than a quarter

What is a unique ability of algae?

• To produce food from sunlight

• To survive in deserts

• To live without water

• To move like animals

Which of the following is an example of multicellular algae?

• Diatoms

• Kelp

• Chlorella

• Euglena

How many main groups of algae are there?

• Six

• Seven

• Five

• Four