Difference WikiBiology

Difference Between Ova and Cyst

Main Difference

The main difference between Ova and Cyst is that Ova is a parasite’s lifespan, whereas Cyst is a parasitic protozoan lifespan.

Ova vs. Cyst

Ove is known as the eggs of parasitic worms that are present in the feces of animals that are a sign of parasitic disorders; on the other hand, the cyst is known as the confrontation stage of a parasitic protozoan which aids in survival under unfavorable conditions. The significance of ova is that it is the propagation stage of parasitic worms; on the contrary, the significance of cyst is that it is the propagation stage of parasitic protozoa.

The ova are typically large regarding its size having 50-130 mm length and 20-70 mm width; on the flip side, the size of the cyst is normally small 40-60 mm across. The thick wall is present in the ova, whereas a thin wall is normally present in the cyst.

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The ova are occupied with cytoplasm and nucleus; on the other hand, as the cyst is more fragile than ova, so it always occupied with fluid. The ova are the reproductive cell of parasitic worms by binary fission or conjugation; on the other hand, the cyst is not a reproductive cell of the parasitic protozoa.

The shape of the ova is pointed at its anterior end, having two contractile vacuoles and funnel-shaped cytostome; on the contrary, the cyst is spherical, and its wall is made up of one or two layers. The ova may be or have small motility; on the other hand, the cyst is non-motile. The surface of the ova is covered with cilia; on the flip side, the surface of the cyst is covered with hard, thick wall and consists of cilia, which is sometimes visible underneath.

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Comparison Chart

OvaCyst
A thick-walled cell that exists in the lifecycle of protozoa having zygote is known as ova.A dormant stage of bacteria/protozoa that enables the survival of bacteria during unfavorable environmental conditions is known as a cyst.
Introduction
Eggs of parasitic worms which are present in the feces of animals that are a sign of parasitic disordersThe confrontation stage of a parasitic protozoan which aids in survival under unfavorable conditions
Significance
It is the propagation stage of parasitic wormsIt is the propagation stage of parasitic protozoa
Size
Typically large regarding its size having 50-130 mm length and 20-70 mm widthNormally small 40-60 mm across
The Thickness of the Wall
The thick wall is presentA thin wall is normally present
Filled With
Occupied with cytoplasm and nucleusMore fragile than ova, so it always occupied with the fluid
Reproductive/Non-Reproductive
The reproductive cell of parasitic worms by binary fission or conjugationNot a reproductive cell of the parasitic protozoa
Shape
Pointed at its anterior end, having two contractile vacuoles, and funnel-shaped cytostomeSpherical and its wall is made up of one or two layers
Motility
Maybe or have small motilityNon-motile
Surface
The surface is covered with ciliaThe surface is covered with hard, thick wall and consist of cilia which is sometimes visible underneath
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What is Ova?

Ova are considered as the eggs of parasitic worms that are present in the stool or waste products as a symbol of parasitic disorder in the particular individual. Parasitic worms or hookworms typically lay eggs while their reproduction.

Many worms or parasites like flukes or tapeworms are generally hermaphrodites, whereas some worms like roundworms are normally monogenic or unisexual. The worm normally gives daily thousands of ova. The structure of the ova is that it comprises a protecting, strong shell that protects it from negative environmental factors or conditions.

The shell of the ova is composed of three different layers: the outer one is known as the proteinic layer, the middle one is a chitinous layer, and the inner one is the lipoidal layer. The ova are sustainable for 1-2 months in freshwater, soil, and in sewage.

The ova of worms enter into the host individual through fecal-oral communication. In most parasitic worms, the larva hatches from sustainable ova inside the body of the host.

What is Cyst?

A cyst is considered as a confrontation stage which helps a protozoan to survive in unfavorable conditions. A cyst is infectious because it is the stage of propagation of parasitic protozoa. The formation of the cyst is known as the encystation process, which occurs in the rectum of the host individual. That’s why the cyst can be found and identifiable in the stool of animals.

The structure of the cyst is spherical. Cysts are covered or coated with a hard or strong cyst wall having two coats. In young cysts, the contractile vacuoles, cilia, and macromolecules are visible. The structures of the organelles of old cysts are granular. Most of the mobility and metabolism is captured inside the cyst.

The trophozoite is known as the growing and reproductive stage of the cyst. The excystation is considered as the formation of a trophozoite from a young cyst. The process of excystation occurs in the large intestine of the host at the following ingestion of the cyst by the host individual.

The trophozoites do not consist of strong forms or structures. The trophozoites are generally covered with cilia on the surface, so that’s why they are motile. The trophozoites consume edibles or nutrients from the innkeeper or host and breed inward the host.

The cyst is also present in the nematodes and bacteria. The cysts are generally less unaffected than spores in bacteria. The cysts in bacteria allow the dispersal of bacteria. The bacteria are then germinating in the presence of favorable conditions. In plant-parasitic nematodes, the cyst occurs as a part of their lifecycle.

Key Differences

  1. The eggs of the bacteria or protozoans that are found in the stool, and it is the symbol of the parasitic disorder. It is known as ova; on the other hand, the resistance stage of a parasite, which usually helps it to survive in unfavorable environmental conditions, is known as a cyst.
  2. The shape of the ova is oval and pointed at its anterior end; on the contrary, the shape of the cyst is spherical.
  3. The structure of the cells of ova have funnel-shaped cytostome near the anterior end, and having two contractile vacuoles; on the flip side, the cyst wall is composed of one or two layers.
  4. The ova are boring motile or sometimes rotatory, while cyst is non-motile in the early stages.
  5. Ova are significant for the propagation stage of parasitic worms; on the other hand, the cyst is significant for the propagation of parasitic protozoans.
  6. The size of the ova is measured from 50-130 mm length and 20-70 mm width, and they are typically larger; on the contrary, the size of the cyst is 40-60 mm and are generally smaller than ova.
  7. The ova normally contain a thick wall; on the flip side, the cyst usually consists of a thin wall.
  8. The cytoplasm and nucleus fill the ova; on the other hand, the cyst is filled with fluid, and that’s why they are more fragile and brittle.

Conclusion

The above discussion concludes that the ova and cyst are the two propagation stages of protozoans. The ova are known as the propagation stage of parasitic worms, whereas the cyst is known as the propagation stage of parasitic protozoa.

Janet White

Janet White is a writer and blogger for Difference Wiki since 2015. She has a master's degree in science and medical journalism from Boston University. Apart from work, she enjoys exercising, reading, and spending time with her friends and family. Connect with her on Twitter @Janet__White