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Nephrostome is found in earthworm in
[BHU- 79]
- a)Septal nephridia
- b)Pharyngeal nephridia
- c)Integumentary nephridia
- d)All
Correct answer is option 'A'. Can you explain this answer?
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Nephrostome is found in earthworm in[BHU- 79]a)Septal nephridiab)Phary...
Ans.
Option (a)
These are found situated on the inter-seg�mental septum between 15th and 16th segments to the posterior side of the body.
Each septum bears nephridia on both the surfaces arranged in semicircles around the intestine, two rows in front of the septum and two behind it. Each septum has about 40 to 50 nephridia in front and the same number behind, so that each segment possesses 80 to 100 septal nephridia except the 15th segment which has only 40 to 50 nephridia. These are not found in the segments up to 14th.
Each septum bears nephridia on both the surfaces arranged in semicircles around the intestine, two rows in front of the septum and two behind it. Each septum has about 40 to 50 nephridia in front and the same number behind, so that each segment possesses 80 to 100 septal nephridia except the 15th segment which has only 40 to 50 nephridia. These are not found in the segments up to 14th.
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Nephrostome is found in earthworm in[BHU- 79]a)Septal nephridiab)Phary...
Nephrostome is found in earthworm in septal nephridia.
Septal Nephridia in Earthworms
------------------------------
Earthworms have a well-developed excretory system that helps in the elimination of waste products from their body. One of the components of this system is the nephridia, which are excretory tubules responsible for filtering waste materials and maintaining osmotic balance.
Nephrostome and Nephridiopore
------------------------------
The nephridia in earthworms consist of three main parts: nephrostome, tubule, and nephridiopore. The nephrostome is a ciliated funnel-like structure present in each segment of the earthworm's body. It acts as the opening or entrance of the nephridium and is responsible for the filtration of waste materials from the coelomic fluid.
Function of Nephrostome
-----------------------
The nephrostomes in the septal nephridia of earthworms help in the initial filtration of waste products from the coelomic fluid. Coelomic fluid is the fluid present in the body cavity of earthworms, which contains waste materials such as nitrogenous waste.
The nephrostomes have cilia that create a current, allowing the coelomic fluid to enter the nephridia. As the fluid flows through the nephridium, useful substances like water, ions, and nutrients are reabsorbed, while waste materials are retained for excretion.
Nephridiopore and Excretion
---------------------------
After the filtration and reabsorption processes, the waste materials are eliminated from the earthworm's body through the nephridiopores. These are small openings located on the ventral side of each segment. The nephridiopores act as the exit points for the filtered waste materials, which are then released into the environment.
Conclusion
----------
In conclusion, the nephrostome is found in the septal nephridia of earthworms. It acts as the entrance or opening for the filtration of waste materials from the coelomic fluid. The nephridia system in earthworms is essential for maintaining osmotic balance and eliminating waste products from their body.
Septal Nephridia in Earthworms
------------------------------
Earthworms have a well-developed excretory system that helps in the elimination of waste products from their body. One of the components of this system is the nephridia, which are excretory tubules responsible for filtering waste materials and maintaining osmotic balance.
Nephrostome and Nephridiopore
------------------------------
The nephridia in earthworms consist of three main parts: nephrostome, tubule, and nephridiopore. The nephrostome is a ciliated funnel-like structure present in each segment of the earthworm's body. It acts as the opening or entrance of the nephridium and is responsible for the filtration of waste materials from the coelomic fluid.
Function of Nephrostome
-----------------------
The nephrostomes in the septal nephridia of earthworms help in the initial filtration of waste products from the coelomic fluid. Coelomic fluid is the fluid present in the body cavity of earthworms, which contains waste materials such as nitrogenous waste.
The nephrostomes have cilia that create a current, allowing the coelomic fluid to enter the nephridia. As the fluid flows through the nephridium, useful substances like water, ions, and nutrients are reabsorbed, while waste materials are retained for excretion.
Nephridiopore and Excretion
---------------------------
After the filtration and reabsorption processes, the waste materials are eliminated from the earthworm's body through the nephridiopores. These are small openings located on the ventral side of each segment. The nephridiopores act as the exit points for the filtered waste materials, which are then released into the environment.
Conclusion
----------
In conclusion, the nephrostome is found in the septal nephridia of earthworms. It acts as the entrance or opening for the filtration of waste materials from the coelomic fluid. The nephridia system in earthworms is essential for maintaining osmotic balance and eliminating waste products from their body.
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