3.5 Algae: Plankton

What percentage of the world's oxygen is produced by algae?

• 25%

• 75%

• 35%

• 50%

Which type of water can algae live in? Choose all that apply.

• saltwater

• freshwater

• brackish water (mix of salt/fresh)

• algae do not live in water

Algae colonies are often referred to as thalli, Why?

• They have both asexual and sexual reproduction capabilities and a cellulose cell wall.

• They cover their colony with slime and live photosythetically.

• Some live in a mutualistic relationship yet have no leaves, roots or stems.

• They function like a big plant, yet have no leave, roots or stems.

Plankton that uses photosynthesis:

• Phytoplankton
• Zooplankton

Some of the benefits of phytoplankton include

• Major aquatic food source

• Humans use it as a natural fertilizer

• Some humans use it as a food and a food additive.

• Chokes out the fish in a good fish pond!

• Keeps the ponds, rivers green which attract fish.

Algae body lacks distinguishable roots, leaves, and trunk. What is the name of algae body?

• Thillus

• Thallus

• Thollus

• Thalus

Which is one is NOT a green algae (Phylum Chlorophyta)

• Spirogyra

• Desmid

• Chlorella

• Diatoms

Which is the most complex green algae?

• Diatoms

• Spirogyra

• Desmid

• Chlorella

What is the difference in Zooplankton and Phytoplankton?

• none, just different genus

• Zooplankton includes animals or protozoa and Phytoplankton does not.

• Zooplankton are heterotrophic and Phytoplankton are photosynthetic.

• They have different cell walls.

When algae form colonies, what holds them together?

• The green substance that they naturallly emit.

• They simply cling to eadh other cell to cell.

• Slime

• Other organisms that live in the water bind them together as they feed on them.