Question

Which one is the correct set for organs of locomotion?

• A. Pedicellaria of Asteroidea.
• B. Trichocysts of Paramecium.
• C. Clitellum of Pheretima.
• D. Posterior sucker of Hirudenaria.

Answer 1

The correct option is D Posterior sucker of Hirudenaria.

• Pedicellariae is a small claw like structure. The organ functions to keep the surface of the organism free from debris and small parasites in Echinoderms.
• Trichocysts is considered to be an organ of offense and defense. This organ is embedded in the outer cytoplasm of Paramecium and other Protozoa.
• Clitellum in Pheretima secretes a viscid sac in which the eggs are deposited. The sac helps to protect the fertilized eggs and the development of the eggs occurs in the case.
• The Hirudinearia is commonly known as a leech. They have two suckers as anterior and posterior. The anterior sucker helps the organism to attach and feed on the blood of the host. The posterior sucker is essential for locomotion.

Thus, the correct answer is option D.