ALGAE intro Flashcards
What is a thalloid plant ? Is algae one ?
no roots , no stems , no leaves , no vascular system , yes
Are algae largely aquatic ?
Yes
Both freshwater and marine
But also occur in moist soils , wood etc.
Name the two symbiotic associations of algae
Lichens ( with fungi)
On sloth bear
Example of colonial algae
1
Volvox
Example of filamentous algae
2
Ulothrix , spirogyra
Algae that forms massive plant bodies . Is it freshwater or marine ?
Kelps , marine
Vegetative reproduction in algae is by ___________
Fragmentation
The most common type of spores for asexual reproduction is________. Are they motile ? If yes , how?
Zoospores , yes , flagellated
What are gametes similar in size called ?
> Example of flagellated and similar in size
> Example of non-flagellated and similar in size
Isogamous
> Ulothrix
> Spirogyra
Dissimilar in size gametes - name , example
Anisogamous , Eudorina
Explain the diff. in gametes in OOGAMOUS reproduction
non-motile large female , smaller motile male
Oogamous examples
Volvox, fucus
How much of the total CO2 fixation is caused by algae ? by which process?
half , photosynthesis
What is the basis of the food cycles of all aquatic organisms?
energy rich compounds produced by algae
The oxygen which algae produce turns to gaseous oxygen. true or false
False , dissolved oxygen
How many species of marine algae are used as food?
Give examples
70 , porphyra , laminaria , sargassum
Mention the commercial uses of algae (3)
1.Marine algae like brown algin and red carragreen produce large amount of hydrocolloids ( water holding substances) - commercially used.
2. Agar is a commercial product obtained from Gelidium and Gracilaria used to grow microbes and in prep. of ice creams and jellies.
3. Chlorella is a unicellelar protein rich algae used by space travellers as food supplement.
