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ZOO201 GDB NO. 1 FALL 2022 |
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ZOO201 GDB NO. 1 FALL 2022 || 100% RIGHT SOLUTION || ANIMAL DIVERSITY: INVERTEBRATES || BY VuTech
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ZOO201
GDB NO. 1
ANIMAL DIVERSITY: INVERTEBRATES
FALL 2022
DUE DATE:
29-11-2022
SOLUTION
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Solutions
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Question:
What is the difference between Cnidaria and porifera?
Answer:
Cnidaria and Porifera are
phyla with small bodied organisms, it does not mean that they are closely
related. Cnidarians and poriferans are mostly marine animals, but some are
found in freshwater, as well. There are many differences exhibited between
cnidarians and poriferans.
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Cnidaria
Cnidaria is a phylum of
animals, which contains amazingly beautiful coral reefs, electrifying
jellyfish, and many other interesting oceanic creatures. There are about 10,000
species of cnidarians and all of them are unique among all other organisms for
the presence of the Cnidocytes. Their outermost body layer is known as the
mesoglea, which is a gel-like substance stacked between two single-cell layered
epithelia. The shape of the body of cnidarians is maintained via hydrostatic
pressure, but some species have endoskeletons or calcified exoskeletons. They
don’t usually have muscles, but some anthozoans do. The movements of the body
are performed using the moving of fibres in the epithelium.
Cnidarians do not have
systems for respiration and circulation, but the cellular diffusion of contents
takes place according to osmotic pressure gradients inside their bodies. The
nerve net is the nervous system, and it secretes hormones, as well. It is
important to notice that their digestive system is incomplete. One of the
important characteristic of them is the alteration of generations with two body
forms, and those are the sexual body plan (medusa) and the asexual body plan
(polyp). However, the overall body plan of all the cnidarians is always
radially symmetrical. The medusae are usually free-swimming animals, while
polyps are sessile.
This phylum includes
animals such as coral, jellyfish, coral, and hydroids. The name “Cnidae” refers
to their “stinging nettles” Cnidaria are classified as a “more complex” phylum
than porifera. Cnidarians
are for example jellyfish, coral, etc.
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Porifera
Porifera means pore
bearer in Latin, which is mainly because poriferans do have a lot of pores on
their body. Porifera is the name of the phylum that consists of sponges, the
multicellular animals without most of the vital body organ systems such as
nervous, digestive, or circulatory systems. However, it may be fair enough to
wonder whether they are animals. In fact, they are classified as animals since
there are no cell walls around their body cells. Additionally, poriferans are
heterotrophs, made of live cells, sexually reproduce.
The interest about
poriferans is very high due to the lack of the vital organ systems. However,
the required nutrients to sustain life of poriferans are taken inside their
bodies and transported through the body using their pores. Sponges live by
attached to a substrate; which means that they are sessile animals, and live in
both freshwater and saltwater. However, the majority lives in the sea and few
in freshwater. Sponges are found in a range of habitats including coastal zones
as well as the deep-sea bottoms. Their bodies do have neither a particular
shape nor symmetry, but it is developed in such a way that increases the
efficiency of water flow through the body. Despite their lowness in body
organization, poriferans are highly diversified with 5,000 – 10,000 species
those have been evolved since 490 – 530 million years.
Sponges, or “The Pore
Bearers” are among the oldest multicellular species, with fossils dating back
over 600 million years ago. They are made up of over 9000 different species and
can range in size from 0.5cm tall to 2m tall. Porifera
are aquatic organisms known as sponges.
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What is the difference between Cnidaria and Porifera?
- Cnidaria and porifera are two different phyla.
- Cnidarians have Cnidocytes but not the poriferans.
- Cnidarians have well-organized organ systems but not the poriferans; on the other hand, poriferans have an efficient tunnel system made up of pores but not the cnidarians.
- Poriferans evolved earlier than cnidarians, according to the fossil evidence.
- Adult sponges live always attached to a substrate, but not all the cnidarians are sessile.
- Cnidarians have defined body shapes but not the poriferans.
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