Quiz Flash Cards for 3/26/25
What are Diatoms?
Unicellular Organisms (One cell)
What is Diatomaceous Earth?
Sedimentary rock made of Fossilized remains of Diatoms
How do Diatoms remain buoyant?
Have oil droplets that let them float.
Can Diatoms photosynthesize
Yes
Are skeletons called Frustule when referring to Diatoms
Yes
What are the 3 Major Photosynthetic on Earth?
(In Order)
1. Cyanobacteria
2. Diatoms
3. Dinoflagellates
Are all algae plants?
No
Pigments in Brown Algae
chlorophylls a and c +
fucoxanthin (which gives
them their brown color)
Products from brown algae
Food, Algin (thickener), Iodine
Parts of brown algae
Holdfast, blades, stipe,
pneumatocysts
Purpose of holdfasts
helps it stay put and attached
Purpose of stipe
helps make it move in water and be flexible
*remember, waves are
strong. If it wasn’t flexible it
would break in due to the
impact.
Purpose of pneumatocysts
filled with gas (mostly car-
bon monoxide) that helps
with flotation and keeping
the blades near the surface
What are the multicellular
stages of brown algae?
Sporophyte (2n)
Gametophyte (n)
What are the unicellular
products of brown algae?
Spores (n)
Gametes (n)
What is the skeleton of
porifera made of?
Spicules and spongin
Spicules
microscopic spine like
structures that can be
made of silica or calcium
carbonate
Spongin
a type of collagen (protein)
where the spicules are em-
bedded
How do sponges reproduce?
Asexually through fragmentation
How many openings do
cnidarians have?
Only one. Acts as both the
mouth and the anus
Two body plans of cnidarians
Polyps- sessile
(anemones)
Medusa- planktonic (typical jellyfish shape)
What are the two tissues
found in cnidaria?
Gastrodermis (tissue lining the stomach)
Epidermis (tissue lining the
outside)
