Protozoan Characteristics and Functions

The video provides an overview of protists, a diverse group of eukaryotic organisms that are not classified as animals, plants, or fungi. It discusses their characteristics, including cell structure and reproduction methods. The video categorizes protists into three main groups: plant-like, animal-like, and fungus-like. Plant-like protists, such as algae, are photosynthetic and contribute significantly to oxygen production. Animal-like protists, or protozoans, are heterotrophic and responsible for various diseases. Fungus-like protists, like slime molds, have unique life cycles and structural differences from true fungi.

What is a defining characteristic of protists?

• They are prokaryotic organisms.

• They have a nucleus.

• They are classified as animals.

• They are always multicellular.

Which of the following is true about plant-like protists?

• They are found only in deserts.

• They contribute significantly to atmospheric oxygen.

• They cannot photosynthesize.

• They are heterotrophic.

What is a common feature of diatoms?

• Their cell walls are made of silica.

• They have cell walls made of cellulose.

• They are used in making glass.

• They are always harmful to humans.

What is the role of dinoflagellates in marine environments?

• They are harmless to sea life.

• They are used in toothpaste.

• They cause red tides.

• They are a type of fungus.

What is the primary method of movement for ciliates?

• Cilia

• Pseudopodia

• Spores

• Flagella

Which protozoan is responsible for African sleeping sickness?

• Dinoflagellate

• Amoeba

• Plasmodium

• Trypanosome

How do amoebas move?

• Using flagella

• Using cilia

• Using spores

• Using pseudopodia

What is unique about sporozoites among protozoans?

• They form spores.

• They are photosynthetic.

• They have flagella.

• They use cilia for movement.

What is a key difference between slime molds and fungi?

• Slime molds have cell walls made of chitin.

• Slime molds have cell walls made of cellulose.

• Slime molds are always unicellular.

• Slime molds are photosynthetic.

In what form can slime molds exist?

• Only as single cells

• Only as multicellular organisms

• Only in dry environments

• As plasmodial and cellular forms