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Which one assists in locomotion [1993]
- a)Trichocysts in Paramecium
- b)Pedicellariae of Star Fish
- c)Clitellum in Pheretima
- d)Posterior sucker in Hirudinaria
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which one assists in locomotion [1993]a)Trichocysts in Parameciumb)Ped...
Hirudinaria (leech), does not possesses setae or parapodia for locomotion. Its posterior sucker helps in locomotion
Most Upvoted Answer
Which one assists in locomotion [1993]a)Trichocysts in Parameciumb)Ped...
Understanding Locomotion in Different Organisms
Locomotion is a crucial biological function that allows organisms to move and interact with their environment. Various structures assist in locomotion across different species. Let’s explore the options provided in the question to understand why the posterior sucker in Hirudinaria (leeches) is the correct answer.
Option A: Trichocysts in Paramecium
- Trichocysts are organelles found in Paramecium that expel a projectile when triggered.
- While they play a role in defense and capturing prey, they do not assist in locomotion.
Option B: Pedicellariae of Starfish
- Pedicellariae are small pincer-like structures on the surface of starfish.
- Their primary function is to keep the starfish clean by removing debris and pests, not for locomotion.
Option C: Clitellum in Pheretima
- The clitellum is a thickened, glandular section of the body in earthworms (Pheretima).
- It is involved in reproduction and mucus secretion but does not directly facilitate locomotion.
Option D: Posterior Sucker in Hirudinaria
- The posterior sucker in Hirudinaria is a muscular structure located at the tail end of the leech.
- It provides a strong grip on surfaces, allowing the leech to anchor itself while moving.
- This sucker aids in locomotion through a combination of attachment and contraction, enabling the leech to glide smoothly over surfaces.
Conclusion
The posterior sucker in Hirudinaria is specifically adapted for locomotion, making it the correct answer. Its ability to anchor and propel the body is essential for the leech’s movement in aquatic environments.
Locomotion is a crucial biological function that allows organisms to move and interact with their environment. Various structures assist in locomotion across different species. Let’s explore the options provided in the question to understand why the posterior sucker in Hirudinaria (leeches) is the correct answer.
Option A: Trichocysts in Paramecium
- Trichocysts are organelles found in Paramecium that expel a projectile when triggered.
- While they play a role in defense and capturing prey, they do not assist in locomotion.
Option B: Pedicellariae of Starfish
- Pedicellariae are small pincer-like structures on the surface of starfish.
- Their primary function is to keep the starfish clean by removing debris and pests, not for locomotion.
Option C: Clitellum in Pheretima
- The clitellum is a thickened, glandular section of the body in earthworms (Pheretima).
- It is involved in reproduction and mucus secretion but does not directly facilitate locomotion.
Option D: Posterior Sucker in Hirudinaria
- The posterior sucker in Hirudinaria is a muscular structure located at the tail end of the leech.
- It provides a strong grip on surfaces, allowing the leech to anchor itself while moving.
- This sucker aids in locomotion through a combination of attachment and contraction, enabling the leech to glide smoothly over surfaces.
Conclusion
The posterior sucker in Hirudinaria is specifically adapted for locomotion, making it the correct answer. Its ability to anchor and propel the body is essential for the leech’s movement in aquatic environments.
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Which one assists in locomotion [1993]a)Trichocysts in Parameciumb)Pedicellariae of Star Fishc)Clitellum in Pheretimad)Posterior sucker in HirudinariaCorrect answer is option 'D'. Can you explain this answer?
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