The world of unicellular, colonial, and multicellular organisms is very variable and polysyllabic. The diversity of their forms is fantastic. Therefore, the reflection of their features, differences, and many other interesting aspects is the main purpose of this work.
The number of cells in the body is related to its functional predisposition. In the case of the unicellular organism, its body only corresponds to a single cell. On the contrary, multicellular organisms are built from numerous cells, which form the body, complicated in their functionality (“Unicellular and Multicellular Organisms” par. 1). The unicellular organisms imply the work activity among the organelles that are their integral cellular part. Moreover, a single cell carries and performs all of the organism’s life functions. In its turn, it could be mentioned that cellular functionality is a micro imprint of the organism’s living processes. There are no boundaries that limit the unicellular organisms in their spatial shape, as it is with the multicellular representatives.
For instance, Chlamydomonas represents a unicellular organism. It is discovered that “its identifying feature is a large chloroplast containing the pyrenoid which aids in starch formation. It also has flagella, which is located at the anterior end of the cell” (“The Volvocine Line: Chlamydomonas” par. 1). Chlamydomonas is able to reproduce asexually and sexually. Chlamydomonas is also an isogamous organism. In its turn, Pandorina is a colonial organism that mostly consists of a conglomerate of cells that corresponds to the number of 8-36 units. In its structure and functionality, it is much more developed than Chlamydomonas, due to its colonial model. It is interesting to mention that each cell of Pandorina asexually reproduces the new colonies, however, the cells of Pandorina are also capable of reproducing sexually through the zygote.
Volvox is an organism that is more complex than the above-mentioned representatives. Volvox and Chlamydomonas are similar in their structure because they both have a sigma, which represents the organ of vision, chloroplasts of a large size, and flagella (“Brief Knowledge About The Volvox” par. 1). In a comparison with other mentioned organisms, Volvox can reproduce only through the specified cells, which are intended to perform the reproductive function only. Just like the other representatives, Volvox can reproduce sexually.
The Environmental Adaptation of Brown and Red Algae
It is required to mention that brown algae can float on the water’s surface thanks to their broad and narrow blades. On the top of the water, they perform photosynthesis with the help of light. (“Adaptations of F. vesiculosus” par. 4). They stay in the places of their comfort without shifting thanks to their anchors, which prevent their entering into space with undesirable conditions. To prevent drying, they use their waxy blades. For photosynthesis to be maximally effective, their body structure includes pigment fucoxanthin, which increases their capability of wavelengths absorption. Their reproduction occurs due to their flagellate spores, which also provide security to their offspring in the surrounding environment.
Red algae represent the kind of organisms that do not have the vascular system included. Therefore, they are forced to consume water by the help of their cellular walls, what also promotes the transferring of the liquid between the cells (“Red Algae” par. 1). Red Algae are mostly small because of the absence of vascular system. It capable of surviving in harsh environments exactly thanks to their size. It is also required to mention that their red color implies the improved light absorption and photosynthesis, even in significant depths.
The Volume of Multicellular Organisms
The volume of multicellular organisms increases due to the process of cellular expansion (“Sizes of Organisms: The Surface Area: Volume Ratio” par. 4). While the size of the cells expands, the volume of the organism grows significantly. Therefore, for the formation of the ratio of living organisms, the surface level is extremely important. The small cellular capacity allows for the oxygen and nutrients to diffuse more quickly than the cell with a large volume.
Adaptations of F. vesiculosus 2011. Web. 2016.
Brief Knowledge About The Volvox 2014. Web.
Red Algae 2013. Web.
Sizes of Organisms: The Surface Area: Volume Ratio 2000. Web.
The Volvocine Line: Chlamydomonas n.d. Web.
Unicellular and Multicellular Organisms 2016. Web.