Biology Questions and Answers
autotrophic beings, euglenas do not
have a cell wall and they can survive “eating” substances from the by
environment when light is not available
for photosynthalso have a photosensitive structureesis. Curiously euglenas
called stigma that orients the movement
of the cell towareuglenas are classified as algads light. Nowae, but it isdays (^)
suspected that they are common
ancestors of algae and protozoans.
- Do algae reproduce
sexually or asexually?
There are algae that rand there are algae that reproduceeproduce sexually
asexually.
In unicellular algae reproduction is
generally asexual by binary division.
In pluricellular algae asexual
reproduction can occur bfragmentation or by sporulation.y
In sexual rpluricellular, theproduction of algae, ere is fusion of gametesuni or (^)
(syngamy). There are algae in which all
cells can balgae in which oecome gametes anly some cells can playnd there are
that role. Some species may present
alternation ogametophytes anf generations, fd sporophytes withorming (^)
different ploidies.
- What is the commercial
importance of algae?
Many algae have high nutritional value
and are commas human food, they are very ercialized and consumepopulard
food in the oriental world. Jelly
compounds are extracted algae, like glues and pastes ffrom someor
industrial and commercial use.The agar-abiological culturgar, use in laboratories aed as a medium fornd in (^)
medicines, acarrageenin, a compond the substance knent of toothnown as
pastes, cosmetics, paint and hygienic
products, are extracted frrhodophyte algae. Diatom alomgae (^)
deposited on the bottom of the sea form
diatomites,filters, refractories, th used in the production oermal isolationf
and cement. Sagricultural fertilizers.ome algae are used as
- What is the phenomenon
known as “red tide”? Which
ambiental harms can it cause?
Red tide is a phenomenon that occurswhen dinoflagellates (algae from the
pyrrophyte group) proliferate
excessivelyliberate toxins t in the oceahat affect the nervousn. These algae (^)
system and can cause death when
ingested by marinhumans that eat contaminatee animals and animals.d by
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