lab 8

Question 1

what are the three types of locomotion?

Answer 1

cilia, flagella or pseudopodia

Question 2

how do euglena eat?

Answer 2

• they are mixtrophs
• able to feed using both autotrophic and heterotrophic methods
• possess chloroplasts and are capable of autotrophic nutrition
• main source of nutrition is photosynthesis
• also possess a gullet and can ingest food particles

Question 3

algae

Answer 3

• large, multicellular organisms
• brown, red and green algae
• ARE photosynthetic but are NOT descended from a common ancestor and are found within two supergroups of the Eukarya

Question 4

why is algae three different colours?

Answer 4

• aquatic organisms and all possess chlorophyll a (some also have b and or c)
• water absorbs light, particularly the longer, red to yellow wavelengths, thus depriving chlorophyll a of much of the light energy it would normally absorb
• algae compensates for this by possessing accessory photosynthetic pigments that absorb more of the light available underwater
• accessory pigments give the seaweed different colours
• red accessory pigment phycoerythrin is common in red algae while the golden accessory pigment fucoxanthin is common in browns

Question 5

light in euglena

Answer 5

does not go to yellow/green filters