Distinguish between the following (a) Pr | Class 11 Biology Chapter Structural Organisation in Animals, Structural Organisation in Animals NCERT Solutions

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Academic session 2026-27, Chapter 7 in the current curriculum.

Welcome to the NCERT Solutions for Class 11 Biology - Chapter Structural Organisation in Animals. This page offers a step-by-step solution to the specific question from Exercise 1, Question 5: Distinguish between the following
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 5: Distinguish between the following
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium
Answer:

 (a)

Prostomium

Peristomium

Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function.

The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening.

(b)

Septal nephridium

Pharyngeal nephridium

They are present on both sides of inter-segmental septa behind the 15thsegment and they open into the intestine.

They are present as three paired tufts in the fourth, fifth, and sixth segments.

 

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NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Structural Organisation in Animals.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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  • Jikki
  • Sep 15, 2019

Thanks

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  • Jul 29, 2019

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Thank u.....!

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Thank you

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Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 5: Distinguish between the following (a) Prostomium and peristomium (b) Septal nephridium and pharyngea....

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