Flashcards in Test 2 Deck (62)
The marine algae are popularly known as _.
What is the more appropriate name?
Classification of seaweeds is based on
Food storage products
What do seaweeds lack compared to higher plants?
Complex structures and reproductive mechanisms
S.W on rocky shores at low tide are _ and _ to withstand _ _.
small; sturdy; waveshock
Kelps found offshore in cold waters are _ _ that form _ _ _.
true giants; dense underwater forests
Seaweeds lack true _, _ and _.
Leaves, stems; roots
Complete body name
Leaf-like, flattened portions of the thallus are known as _.
What makes blades important?
Increase surface area and are the main photosynthetic regions.
Blades are sometimes kept close to the sea surface by means of gas-filled _.
To maximize exposure to sunlight
Stem-like structure on seaweeds
Stipe (from which the blades originate)
Most are freshwater, 10% are marine
Pigments of green algae?
Food storage product?
Same as higher land plants
Chlorophyl a,b and carotenoids
Algae that has predominance of yellow pigments a and c
Brown algae charcteristics
Most dominant primary producers on temperate and polar rocky coasts; most complex and largest
Can withstand exposure to air
Brown algae characteristics p.2
Blades up to 3m in length, harvested for food. Blades may be single or split or branch. several blades may grow from a single holdfast
Brown algae characteristics p.3
largest kelps are found in deeper water below the lowest tide level
Bullwhip kelp, nereocystis, long whip-like stipe of 30m.
Pelagophycus has antler-like branches
Macrocystis _: Several long stipes grow from the _, from which _ _ develop.
Pyrifera; holdfast, elongate, blades
Many plants, each with many fast-growing and intertwined stipes, form dense and very productive _ _ or _ _
kelp beds; kelp forests
Algae that has more species of marine
Examples of Red algae
Porphyra; carrageenan; agar
Coralline red algae
Deposit calcium carbonate around cell walls;
Some coralline red algae grow as _ or _ on rock. Warm water species _ coral reef debris together in the formation of _ _.
smooth; encrusting; cementing; coral reef
Reproduction of seaweeds: Sexual and asexual means; alternation of generations...
Haploid gametophyte and a diploid sporophyte
fragments of the thallus may grow into new individuals (Sargassum)
_ _ divides by _ -- haploid _ -- into _ _ --- produces _ _.
diploid sporophyte, meiosis, spores, haploid gametophyte, haploid gametes.
Truly marine flowering plants; rarely exposed by low tide, submerged by seawater; not true grass, closest relative - lily