3.6 Ticket for Understanding

If you observed a sessile colony of algae, would it tend to move about or stay in one place?

• Stay in one place

• They stay in one place for a time, but then they will move when it is time to reproduce

• Move about

• Spins around

Many biologists consider diatoms the most important form of algae in the world. Why?

• They give us sand to make glass

• They are used in industry for filters

• They produce most or our oxygen supply

• They use up a lot of oxygen in the water

What are tiny organisms that float near the surface of the water?

• plankton
• organisms
• abiotic factor
• insects

What organism(s) are pictured here?

• Diatom

• Dinoflagellate

• Zooplankton

• Nekton

Plankton that uses photosynthesis:

• Phytoplankton
• Zooplankton

Dinoflagellates can cause __________ which is toxic to fish, shellfish and humans.

• Green TIde
• Red Tide
• Malaria
• Algal Bloom

Red tide is caused by rapid multiplication of

• BGA- gonyaulex

• Dinoflagellate- gonyaulex

• Diatoms- gonyaulex

• Desmid- gonyaulex

Chrysophytes are

• Diatoms and desmids

• Diatoms and diano flaggellates

• Slime moulds and desmids

• Slime moulds and diatoms

which of the following option for diatoms is correct

• Pecto-cellulosic cell wall

• silicified cell wall

• multicellular eukaryotes

• produce saxitoxin

The benefits of diatomaceous earth are

• its abrasive ability

• kills fleas

• coffee filters

• industry uses it to filter liquids

• can polish teeth