NEET Biology Excretory Products and their Elimination Notes

Read and download the NEET Biology Excretory Products and their Elimination Notes. Designed for 2025-26, this advanced study material provides NEET Biology students with detailed revision notes, sure-shot questions, and detailed answers. Prepared by expert teachers and they follow the latest NEET, NCERT, and KVS guidelines to ensure you get best scores.

Advanced Study Material for NEET Biology Excretory Products and their Elimination

To achieve a high score in Biology, students must go beyond standard textbooks. This NEET Excretory Products and their Elimination study material includes conceptual summaries and solved practice questions to improve you understanding.

NEET Biology Excretory Products and their Elimination Notes and Questions

 

Excretion is the removal of metabolic waste (mainly) from the body.
 
Faecal matter is undigested waste, and not metabolic waste, so it is not considered as excretory product.
The excretory wastes are of two types.
 
(1) Non-nitrogenous wastes−
 
• Carbon-di-oxide- It is removed through lungs (accessory excretory structure).
• Excess water and excess salts are removed through kidney (primary excretory structure).
 
(2) Nitrogenous wastes−
 
Such wastes are produced from the metabolism of proteins and nucleic acids.
 
(i) Ammonia (NH3)−
 
• The animals in which ammonia is the major excretory product are called Ammonotelics.
• Ammonia is about 1−lakh times more toxic than urea.
• Removal of ammonia requires plenty of water. It is, therefore, the excretory product in aquatic animals.
eg. protozoans, porifers, coelentrates, aquatic molluscs, aquatic crustaceans,
aquatic insects, platyhelminthes, protochordates, teleosts (bony fi shes) and aquatic amphibians.
In fi shes most of the Ammonia is lost as Ammonium ions (NH4 +) through the gills.The kidney in such animals plays a minor role in the excretion of Ammonia.
 
(ii) Urea −
 
• The animals in which urea is the major excretory product are called Ureotelics.
• Urea is less toxic and requires less water for elimination.
• Most of the amphibious animals, therefore, have urea as the major excretory product. eg Cartilaginous fi shes (marine), Amphibians (amphibious), Reptiles (amphibious, like turtle) and all mammals (aquatic, amphibious or terrestrial). Sharks also produce urea but retain a major part of it as osmolyte for maintaining osmolarity of their body fluid.
 
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NEET NEET Biology Excretory Products and their Elimination Study Material

Students can find all the important study material for Excretory Products and their Elimination on this page. This collection includes detailed notes, Mind Maps for quick revision, and Sure Shot Questions that will come in your NEET exams. This material has been strictly prepared on the latest 2026 syllabus for NEET Biology. Our expert teachers always suggest you to use these tools daily to make your learning easier and faster.

Excretory Products and their Elimination Expert Notes & Solved Exam Questions

Our teachers have used the latest official NCERT book for NEET Biology to prepare these study material. We have included previous year examination questions and also step-by-step solutions to help you understand the marking scheme too. After reading the above chapter notes and solved questions also solve the practice problems and then compare your work with our NCERT solutions for NEET Biology.

Complete Revision for Biology

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Our advanced study package for Chapter Excretory Products and their Elimination includes detailed concepts, diagrams, Mind Maps, and explanation of complex topics to ensure NEET students learn as per syllabus for 2026 exams.

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Yes, our subject matter experts have updated the Chapter Excretory Products and their Elimination material to align with the rationalized NCERT textbooks and have removed deleted topics and added new competency-based questions.