examples of unicellular organism
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Answers:A green alga, genus Caulerpa, is the largest unicellular protist. However, "green algae" is not a correct answer, as most green algae are either colonial, like the species, Volvox; or, possess tissues, like the species, Ulva. Check out these links. PS: an amoeba is a more common example of a single celled protist.
Answers:Amoeba take up water constantly through the process of osmosis because via porous cell membrane. The amoeba "breathes" using this membrane - oxygen gas from the water passes in to the amoeba through the cell membrane and carbon dioxide gas leaves through it. Since unicellular organism has large surface area to volume ratio, (without specialized organ for breathing) if they lived on land, they would dry up rather quickly. For this reason they must perform gas exchange in water.
Answers:It can be the other way around, but some algae and plants exhibit what is known as alternation of generations. This is an alternation between their ploidies, different parts of their life cycles. At the beginning, their is a diploid multicellular sporophyte. This is the algae in its natural form, you could say. These sporophytes release hapolid motile zoospores, which don't immediately fertilize their opposite haploid cell (sperm to egg), but they grow into multicellular haploid organisms called gametophytes. These gametophytes produce haploid gametes, which go onto fertilize another gamete, thus becoming the diploid zygote. This is the unicellular diploid stage, and all organisms have this diploid zygote as a result of 2 haploid cells fertilizing.This then undergoes mitosis to become the diploid sporophyte, and it happens all again. So you see, there is a unicellular diploid, unicellular haploid, multicellular haploid, and multicellular diploid stage in the algae life cycle. All of them are present at certain times, so every stage is present in the algae life cycle.