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Protonephridia are primarily concerned with ionic and fluid volume regulation i.e. osmoregulation. These are found in
a. Planaria
b. Some annelids and rotifers
c. Cephalochordates
Choose the correct option.
- a)a only
- b)b and c only
- c)a and c only
- d)a, b and c
Correct answer is option 'D'. Can you explain this answer?
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Protonephridia are primarily concerned with ionic and fluid volume re...
Protonephridia or flame cells are excretory structures in platyhelminthes, rotifers, some annelids and cephalochordates.
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Protonephridia are primarily concerned with ionic and fluid volume re...
Protonephridia are excretory structures found in certain organisms that are primarily concerned with ionic and fluid volume regulation, also known as osmoregulation. These structures play a crucial role in maintaining the internal balance of solutes and water in the body.
Protonephridia are found in various organisms, including:
a) Planaria: Planaria are flatworms belonging to the class Turbellaria. They possess protonephridia, which help in excretion and osmoregulation. These excretory structures consist of flame cells, which are specialized cells that contain cilia. The beating of these cilia creates a current that helps in the filtration of body fluids. The filtered fluid is then transported through tubules and eventually expelled from the body.
b) Some annelids and rotifers: Annelids are segmented worms, and certain species possess protonephridia for excretion. For example, earthworms have tubular excretory structures called nephridia, which function similarly to protonephridia. Rotifers, on the other hand, are microscopic aquatic organisms that also have protonephridia for excretion and osmoregulation.
c) Cephalochordates: Cephalochordates, also known as lancelets, are primitive chordates that possess protonephridia. These structures aid in the regulation of ionic and fluid balance in the body of these marine animals.
Thus, the correct option is d) a, b, and c, as protonephridia are found in planaria, some annelids (such as earthworms), rotifers, and cephalochordates (such as lancelets).
Overall, protonephridia are essential excretory structures that help in maintaining osmotic balance and fluid volume regulation in various organisms. They play a vital role in eliminating metabolic waste, regulating ions, and ensuring the overall homeostasis of the organism.
Protonephridia are found in various organisms, including:
a) Planaria: Planaria are flatworms belonging to the class Turbellaria. They possess protonephridia, which help in excretion and osmoregulation. These excretory structures consist of flame cells, which are specialized cells that contain cilia. The beating of these cilia creates a current that helps in the filtration of body fluids. The filtered fluid is then transported through tubules and eventually expelled from the body.
b) Some annelids and rotifers: Annelids are segmented worms, and certain species possess protonephridia for excretion. For example, earthworms have tubular excretory structures called nephridia, which function similarly to protonephridia. Rotifers, on the other hand, are microscopic aquatic organisms that also have protonephridia for excretion and osmoregulation.
c) Cephalochordates: Cephalochordates, also known as lancelets, are primitive chordates that possess protonephridia. These structures aid in the regulation of ionic and fluid balance in the body of these marine animals.
Thus, the correct option is d) a, b, and c, as protonephridia are found in planaria, some annelids (such as earthworms), rotifers, and cephalochordates (such as lancelets).
Overall, protonephridia are essential excretory structures that help in maintaining osmotic balance and fluid volume regulation in various organisms. They play a vital role in eliminating metabolic waste, regulating ions, and ensuring the overall homeostasis of the organism.
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Protonephridia are primarily concerned with ionic and fluid volume regulation i.e. osmoregulation. These are found ina. Planariab. Some annelids and rotifersc. CephalochordatesChoose the correct option.a)a onlyb)b and c onlyc)a and c onlyd)a, b and cCorrect answer is option 'D'. Can you explain this answer?
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