lab 2-3 review extra

Question 1

***Dinoflagellates -

Answer 1

2 perpendicular flagella ((Transverse (in groove); longitudinal (free))

• covering made up of plates of cellulose
• Large part of phytoplankton
• Zooxanthellae” = symbiotic with coral
• causes red tides
• algal bloom/eutrophication

Question 2

Desmids

Answer 2

-Unicellular
◦Belong to the Charophyte group of green algae
◦Consists of 2 halves that are a mirror-image of one

Question 3

Volvox

Answer 3

volvox:
Colonial = association of independent cells
◦Up to 50,000 cells
◦Can’t live alone

◦Form hollow spheres of many cells arranged in a single layer on periphery

-Daughter colonies develop within parental colony (an enzyme dissolves part of parental wall so they can escape when mature!)
Reproduction—-
◦Oogamy – sperm swims tononmotile egg to form
a diploid zygote
◦Asexual – volvox cells divide, bulge inward, and produce new colonies called; daughter colonieS

Question 4

***Spirogyra

Answer 4

• **Spirogyra
• Filamentous
• Mucilage = feels slippery
• Winter = 2n zygotes “hibernate”

-Belong to Charophyte group

Question 5

***Chlamydomonas

Answer 5

***Chlamydomonas

***Pyrenoid = starch production & storage

***Stigma = light-sensing spot

◦Unicellular
◦Motile
◦2 flagella

Question 6

***Laminaria

Answer 6

“Kelp”
***Cell walls contain a mucilaginous material that inhibits desiccation

-One of the largest
algae species

Question 7

Sarggasum

Sargasso Sea

Answer 7

“Gulfweed”

****Open-ocean freefloating algae =holopelagi
     NW Atlantic (***Sargasso Sea***)

◦Carribean Sea
◦Gulf of Mexico
◦“Oasis in the desert of ocean”

Question 8

Fucus

Answer 8

“Rockweed”
◦Intertidal
   -Holdfast
◦Multicellular conceptacles
          -Oogonia  eggs
          -Antheridia  sperm

Question 9

Euglenoids

Answer 9

Both plant like and animal like ( Autotrophs, Heterotrophs, Saprotroph)

◦Unicellular
◦FW flagellates
◦Protein pellicle
◦Light-sensing eyespot/ stigma
◦Photo-heterotrophs
◦Some have chloroplasts & can photosynthesize
◦Some are saprophytic

Question 10

what has porous shells made of calcium carbonate, giving them a chalky appearance and texture.

Answer 10

forams