Overview of Protista and Its Classification

Published: 2021-07-12 04:40:06
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Monophyletic groups all come from a single common ancestor, but for paraphyletic groups, not all of the descendants are counted, some are excluded. Protista is a part of this group, meaning they do not share derived characteristics that separate them from other lineages. The major lineages are Amoebozoa, Opisthokonta, Excavata, Plantae, Rhizaria, Alveolata, and Stramenopila. Cells that fall under the lineage amoebozoa cells do not have a cell wall and when cells extend outward during movement they create large lobes. The cells found in the opisthokonta lineage are reproductive cells that have only one flagellum at their base. They have a fold in the inner membrane of the mitochondria that is flat and not tube shaped which is unusual among eukaryotes.
In this lineage protist, fungi, and humans are included. Those that fall under the excavata lineage usually lack mitochondria even though the original excavata cells are derived from mitochondria, they ingest prey and organic debris. Cells in the plantae lineage have double membranes with chloroplasts inside. The rhizaria lineage has cells that don’t have cell walls but some produce a shell-like covering in its place. When the cell is extended outward and is moved they are threadlike in shape. Alveolata lineage cells have a support like structure that forms a continuous layer right underneath the plasma membrane called the alveoli.Stramenopila lineage cells usually have flagella, usually two if it is present, but one is covered with hairlike projection. This system is more specific and breaks down the cellular level while the four kingdoms simply puts the protist into two separate kingdoms. Protists are very heterogeneous, making it discernible and hard to properly place it in one of the two kingdoms given.
There are four main ways that protista can be classified; how and what they eat, their mobility, their sex life or the life cycle (how they reproduce), or where they live. There are four different ways in which the Protista can acquire their food, they can invest particles, they can intake small organic molecules, they can use photosynthesis, and they’re able to use all three of the previously named methods based on certain conditions that they’re in. They move by swimming via flagella or cilia or they glide on protein or carbohydrates slime. Most protista reproduce sexually via meiosis, however, they later reproduce asexually; while a few protista reproduce entirely asexual. Most protists are equal aquatic however some live in the soil.
Since most protists crave aquatic environments I would check on the waterfront, I will see if any algae resides on the rocks. I would also check the surface of the water because it is a spot where a lot of photosynthesis takes place. We can also look for fish tanks in the dorms and if those aren’t cleaned regularly you will find protist living amongst the fish on the sides.

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