Plant-Like Protists and Algae Quiz
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Questions and Answers

What are plantlike protists commonly called?

algae

Algae include only multi-cellular organisms.

False

In the process of photosynthesis, what substances trap the energy of sunlight?

accessory pigments

How does water affect the sunlight that passes through it?

<p>the water absorbs the light's energy</p> Signup and view all the answers

Why does the dim blue light that penetrates deep into the sea contain little energy that chlorophyll a can use?

<p>because chlorophyll a is most efficient at capturing red and violet</p> Signup and view all the answers

How have various groups of algae adapted to conditions of limited light?

<p>evolved different forms of chlorophyll</p> Signup and view all the answers

What are accessory pigments?

<p>absorb light at different wavelengths of light than chlorophyll</p> Signup and view all the answers

Why are algae such a wide range of colors?

<p>because accessory pigments reflect different wavelengths of light than chlorophyll</p> Signup and view all the answers

Euglenophytes are members of the phylum?

<p>euglenophyta</p> Signup and view all the answers

Protists are remarkably similar to zoo-flagellates.

<p>True</p> Signup and view all the answers

Protists possess chloroplasts.

<p>True</p> Signup and view all the answers

Protists have a cell wall.

<p>False</p> Signup and view all the answers

Protists have two flagella.

<p>True</p> Signup and view all the answers

What is an eye-spot and what is its function?

<p>a cluster of reddish pigment that helps the organisms find sunlight to power photosynthesis</p> Signup and view all the answers

Euglenas have a tough, intricate membrane called a _____

<p>pellicle</p> Signup and view all the answers

How do euglenas reproduce?

<p>asexually/binary fission</p> Signup and view all the answers

Dinoflagellates are members of the phylum?

<p>pyrrophyta</p> Signup and view all the answers

Dinoflagellates generally have one flagellum.

<p>False</p> Signup and view all the answers

Many species of dinoflagellates are luminescent.

<p>True</p> Signup and view all the answers

Most dinoflagellates reproduce by binary fission.

<p>True</p> Signup and view all the answers

Dinoflagellates have their DNA tightly bound with histones.

<p>True</p> Signup and view all the answers

The yellow-green algae and the golden-brown algae are members of the phylum?

<p>chrysophyta</p> Signup and view all the answers

What color are the chloroplasts of chrysophytes?

<p>yellow, green, and golden-brown</p> Signup and view all the answers

Chrysophytes are very rare in almost all environments.

<p>True</p> Signup and view all the answers

Chrysophytes' cell walls are rich in silicon.

<p>False</p> Signup and view all the answers

Chrysophytes generally store food in the form of oil.

<p>True</p> Signup and view all the answers

Some chrysophytes form threadlike colonies.

<p>True</p> Signup and view all the answers

Diatoms are members of the phylum?

<p>bacillarophyta</p> Signup and view all the answers

Diatoms are very rare in almost all environments.

<p>False</p> Signup and view all the answers

Diatoms' cell walls are rich in silicon.

<p>True</p> Signup and view all the answers

Diatoms are shaped like a petri-dish or flat pillbox.

<p>True</p> Signup and view all the answers

Diatoms are among the most abundant organisms on Earth.

<p>True</p> Signup and view all the answers

How do plantlike protists make much of the diversity of aquatic life possible?

<p>plantlike protists are important, their position is at the base</p> Signup and view all the answers

What is the population of small photosynthetic organisms found at the surface of the ocean of the food chain?

<p>phytoplankton</p> Signup and view all the answers

What are the benefits for both the corals and the inter-cellular dinoflagellates that some contain in this symbiotic relationship?

<p>many types of coral contain inter-cellular dinoflagellates; these dinoflagellates allow the tiny coral animals to use the food products of photosynthesis and allow coral to grow. Then dinoflagellates feed on the waste products.</p> Signup and view all the answers

What is the immediate increase in the amount of algae and other producers that results from a large input of a limiting nutrient?

<p>algal blooms</p> Signup and view all the answers

How can an algal bloom be harmful?

<p>they deplete the nutrients in the water</p> Signup and view all the answers

Study Notes

Plant-Like Protists

  • Plant-like protists are commonly known as algae.
  • These organisms can be unicellular or multicellular, not exclusively multicellular.
  • Accessory pigments play a crucial role in photosynthesis by trapping sunlight energy.
  • Water absorbs light energy, affecting photosynthesis in aquatic environments.
  • Dim blue light penetrates deep underwater but is less effective for chlorophyll a, which is most efficient at capturing red and violet light.
  • Different forms of chlorophyll have evolved among various algae groups to adapt to limited light conditions.

Accessory Pigments and Color

  • Accessory pigments absorb light at different wavelengths compared to chlorophyll.
  • Algae exhibit a vast range of colors because accessory pigments reflect different wavelengths of light.

Euglenophytes

  • Euglenophytes belong to the phylum Euglenophyta.
  • These protists are similar to zoo-flagellates, possessing chloroplasts and often two flagella.
  • They may lack a cell wall, contrary to some assertions.
  • An eye-spot in euglenas consists of reddish pigment and aids in locating sunlight for photosynthesis.
  • Euglenas have a tough membrane known as a pellicle and reproduce asexually via binary fission.

Dinoflagellates

  • Dinoflagellates are classified under the phylum Pyrrophyta.
  • Contrary to some beliefs, they generally have two flagella, not one.
  • Many species of dinoflagellates are luminescent and primarily reproduce by binary fission.
  • Their DNA is loosely associated with histones, differing from many other organisms.

Chrysophytes

  • Yellow-green algae and golden-brown algae are categorized in the phylum Chrysophyta.
  • The chloroplasts of chrysophytes display colors of yellow, green, and golden-brown.
  • Chrysophytes are relatively rare in diverse environments and store food primarily in oil.
  • Their cell walls are not rich in silicon, yet some can form threadlike colonies.

Diatoms

  • Diatoms belong to the phylum Bacillariophyta.
  • They are abundant in various environments and characterized by cell walls rich in silicon.
  • Diatoms have distinct shapes, often resembling petri dishes or flat pillboxes, and are among the most plentiful organisms on Earth.

Ecological Importance

  • Plant-like protists are essential for aquatic life, forming the base of the food chain as primary producers.
  • Phytoplankton, small photosynthetic organisms found on ocean surfaces, significantly contribute to marine ecosystems.

Coral Symbiosis

  • Some corals contain intracellular dinoflagellates, which produce food through photosynthesis.
  • This symbiotic relationship benefits corals by providing nutrients while dinoflagellates utilize coral waste.

Algal Blooms

  • Algal blooms occur due to a sudden increase in algae and producers from excess limiting nutrients.
  • These blooms can be harmful, as they deplete water nutrients and disrupt aquatic ecosystems.

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Description

Test your knowledge on plant-like protists, commonly known as algae. This quiz covers their structure, photosynthesis, and specific groups such as Euglenophytes. Discover how their colors are influenced by accessory pigments and light absorption.

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