What is Algae (General Lecture)

What is Algae (General Lecture)

I am going to talk about What is Algae (General Lecture) if we talk about the classification then we have the five kingdoms which are as follows;

  • Plantae
  • Fungi
  • Animalia
  • Bacteria
  • Archaea

The group Protista:


Now in What is Algae (General Lecture) we divide these kingdoms and the Protista into two major groups based on their cell types each living organism is either composed of eukaryotic organisms or prokaryotic organisms. Members of the bacteria in archaea prokaryotic cells that means that their cells do nucleus instead they have a chromosomal DNA that is not surrounded by a membrane it is free from the cytoplasm. So these organisms don’t have membrane-bound organelles. These organisms are present in plant, fungi and animalia.


Now in What is Algae (General Lecture) the Protista are all composed of eukaryotic cells their cells contain nuclei or nucleus singular and they all have membrane-bound organelles.

Remember that members of the group protista basically a hard part group of organisms that have different ancestral this group contains algae as well as protozoa.

Polyphyletic group:

Now in What is Algae (General Lecture) the polyphyletic group consists of green algae, Diatoms, Brown Algae and red algae and some protozoa members. The term polyphyletic means is that there are just ancestral lineages so if we look at them genetically we find that relate to each other or not genetically similar to each other and do have a common ancestor this makes it very difficult to study these nonetheless they’re put together in this group generalized characteristics that apply to all of them for instance the algae are considered as the plant like animal.


Now in What is Algae (General Lecture) why Protista let these characteristics but before I do I just want to stop and briefly mention the cyanobacteria you might a classifications scheme that groups these prokaryotic photosynthetic micro-organisms as blue-green algae however shows that these cyanobacteria actually belong in that they are made up of single prokaryotic.

I don’t consider them as being algae instead prokaryotic cells and members of the kingdom bacteria so I’m going to leave those out so lets algae vary in their colour, habitat from being unicellular that means single-cell all multicellular meaning made up of more than one cell big macroscopic means that you need to view them in microscope could not see in human eyes.

Cell wall:

In this lecture what is Algae (General  Lecture), we discuss about that some algae will have different cell walls. All these characteristics that we discussed above are used to group these algae into major phyla. We have the seven major groups as the;

  • Brown Algae
  • Red Algae
  • Green Algae
  • Dinoflagellates
  • Diatoms
  • Water Molds

Its phyla are as follows;

  • Phaeophyta
  • Rhodophyta
  • Chlorophyta
  • Dinoflagellata
  • Bacillariophyta
  • Oomycota

Cell wall of Algae:

Algae have cell walls which are made out of various carbohydrates and this is what differs them from the protozoa.

On the other hand, the Protista doesn’t have a cell wall.

Size & cell arrangement:


  • Most Algae are microscopic
  • Need a microscope to see
  • Some are motile


  • 60 meter (200 feet) in length
  • Not motile

Cell arrangement:

  • Unicellular
    • A single-cell organism
    • Colonial
      • Single-cell organisms attach together.
    • Multicellular
      • Filamentous
        • Branched or unbranched
      • Complex

Brown Algae:

               Now in What is Algae (General Lecture) multicellular algae are more complex in nature. Often times resembled out of plants and its particular fronts will click leaves holdfast that basically anchors it to a rock mentioned it does not have leaves. These leaves don’t have a plant vascular system, therefore, it puts this organism into the algae category. However, like plants algae have eukaryotic cells they have chloroplasts that contain chlorophyll. Let briefly mention the exception though before I go on is that true for all Algae except for the water molds.

Water Molds:

Now exception of the water molds besides has chlorophyll. They have different light-sensitive accessory pigments it’s the combination of chlorophyll and these accessory pigments that give them the different colours and pigments.

Chlorophyll plays the major role in photosynthesis just Algae uses the energy from the solar energy that works on water molecules it releases the energy from molecules and thus forms oxygen that released energy is then used to take six molecules of carbon dioxide and generate one molecule of sugar and carbohydrate.  Equally amazing though is that produced 70 to 80 percent of the earth’s and atmospheric oxygen as a byproduct of this photosynthesis reaction produce enough carbohydrates not further only support the entire marine and freshwater food chain.

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Algae provide organic nutrients:

Now in What is Algae (General Lecture) the algae are the producers of carbohydrates. They produce enough organic nutrients that are eaten by primary consumers the shrimp or the protozoa was cocoa pods these are small living organisms they, in turn, becomes food for the small fishes that are the secondary consumers. Tertiary consumers and ordinary consumers so on. So you can understand the importance of algae for the aquatic environment.

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