Difference between revisions of "Translations:AY Honors/Marine Algae/Answer Key/13/en"

Revision as of 08:08, 8 December 2020

10. What is the greatest depth that algae grows in the ocean? Why can it not grow in deeper water?

The deepest living algae are those that are attached to the sea-bed under several meters of water. The limiting factor in such cases is the availability of sufficient sunlight to support photosynthesis. The deepest living seaweeds are the various kelps.

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-==12. Describe the two ways that algae reproduce. ==
+==10. What is the greatest depth that algae grows in the ocean? Why can it not grow in deeper water? ==
-===Sexual Reproduction===
+The deepest living algae are those that are attached to the sea-bed under several meters of water. The limiting factor in such cases is the availability of sufficient sunlight to support photosynthesis. The deepest living seaweeds are the various kelps.
-Most forms of algae reproduce sexually by forming spores. The spores, when cast off the adult organism, develop into male and female gametes which carry only half the genetic information of the parent organism. These gametes are motile, meaning they can move around by themselves, propelled by tiny flagella. When male and female gametes from the same or from different parent organisms combine, the genetic material fuses to create an organism with a full complement of genetic material. This is very similar to the way that ferns reproduce (see the [[../Ferns|Ferns]] honor for more details.
-===Asexual Reproduction===
-Asexual reproduction is advantageous in that it permits efficient population increases, but less variation is possible. Sexual reproduction allows more variation but is more costly because of the waste of gametes that fail to mate, among other things. Often there is no strict alternation between the sporophyte and gametophyte phases and also because there is often an asexual phase, which could include the fragmentation of the thallus.