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  • The first segment of the earthworm is ____ while _______ segments are clitellum.  Option: 1 Prostomium; 10-12  </di

The first segment of the earthworm is ____ while _______ segments are clitellum.

 

Option: 1

Prostomium; 10-12

 


Option: 2

Prostomium; 14-16

 


Option: 3

Peristomium; 14-16

 


Option: 4

None of these


Answers (1)

best_answer
 
  • The prostomium is a lobe that acts as the covering of the mouth. It also acts as a wedge to open up the soil when the earthworm crawls.
  • The first segment is called the peristomium. It contains the mouth and buccal cavity.
  • In a mature earthworm, the segments 14-16 are covered with a dark band of glandular tissue called clitellum.
  • Therefore, the body of the earthworm can be divided into pre-clitellar, clitellar and post-clitellar regions.
  • Clitellum can be defined as the think and non-segmented region towards the head that secretes a viscid sac in which the eggs are deposited. 
  • Hence, the main function of the clitellum is to store the eggs of the earthworm.
  • The clitellum is a part of the reproductive system.
  • It is visible when the earthworm is sexually active.

The first segment of the earthworm is peristomium while 14-16 segments are clitellum.

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Gunjita

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