Protists

Cara Small

What is a Protist?

Protists are usually single-celled organisms, but some are multicellular. They are part of the Protista kingdom (are diverse eukaryotes).

Euglena-

What is a Euglena?

A euglena is a unicellular organism. This unicellular organism is plant-like because it has chloroplasts, and can, therefore, make its own food through photosynthesis.

How does it get its food?

  • By using photosynthesis or...
  • By absorbing food from the environment.

How does it move?

  • Moves by using its flagellum (one).

How does it reproduce?

  • Reproduces asexually
  • By using binary fission

How does it respond to the environment?

  • Responds to the environment by using its eyespot to find light that is needed for photosynthesis.
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This Is a Video of Euglena Moving:

Euglena viridis - BF, DIC microscope 400x

Amoeba-

What is an Amoeba?

An amoeba is a unicellular organism. The amoeba is animal-like, since they do not have chloroplasts. Instead they surround food particles with pseudopods to get their food.

How does it get its food?

  • By surrounding tiny particles of food with pseudopods (forms a bubble-like food vacuole).

How does it move?

  • By changing the shape of their body, which forms pseudopods.

How does it reproduce?

  • Reproduce asexually
  • By using binary fission.

How does it respond to the environment?

  • Responds to the environment by turning into a cyst
  • It turns into a cyst when the conditions are bad

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This Is a Video of an Amoeba Eating:

Amoeba eats two paramecia (Amoeba's lunch)

Paramecium-

What is a Paramecium?

A paramecium is a unicellular organism. This organism is animal-like, since it does not have chloroplasts to make their food. They use cilia to push food into their mouths.

How does it get its food?

  • By using its cilia to push food and water into their mouth, also known as its oral groove.

How does it move?

  • By using its cilia

How does it reproduce?

  • Reproduce sexually or asexually
  • Usually by conjugation

How does it respond to the environment?

  • Responds with avoidance behavior (goes away from danger; avoids danger)
  • Or with its tricocyst: it shoots out strings when in danger to keep it away or to look bigger (to intimidate the predator)
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This Is a Video of Conjugation in Paramecium:

Conjugating Paramecium multimicronucleatum (parental discretion advised)

Volvox-

What is a volvox?

A volvox is a unicellular organism. This unicellular organism is plant-like, since it has the chloroplasts needed to make its own food through photosynthesis.

How does it get its food?

  • By using photosynthesis

How does it move?

  • It beats its 2 flagella together to roll through the water

How does it reproduce?

  • The parent ball bursts open and releases the daughter colonies. When the daughter colonies grow up and become adults, the cycle starts over.

How does it respond to the environment?

  • They live in colonies, unlike other unicellular organisms.
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This Is a Video of a Volvox Moving:

volvox 2