NSEB Excretion in Animals Question Practice Paper: PDF Download Links

NSEB excretion in animals question practice papers contain questions that assess the different ways in which animals carry out the excretion of metabolic waste from the body, particularly nitrogenous waste such as ammonia, urea and uric acid. During these assessments, students will get practice identifying the specialized organs involved in excreting waste in animals, such as nephridia in invertebrates and kidneys or Malpighian tubules in vertebrates or insect animals. 

The topics associated with animal excretion usually include diffusion and the use of lungs and gills for gaseous waste, or adaptations for conserving water while excreting waste. Ultimately, assessments on animal excretion focus on comparisons of aquatic and terrestrial animal excretory systems, the functions of different organs within the specialization for excreting waste, and excretion as an important factor of animal survival.

NSEB Excretion in Animals Question Practice Paper Overview

The National Standard Examination in Biology (NSEB) is a competitive exam for students of higher secondary schools in India, mainly the students in Classes 11 and 12. It is the first level of the selection process of the International Biology Olympiad (IBO).

The topics associated with animal excretion usually include diffusion and the use of lungs and gills for gaseous waste, or adaptations for conserving water while excreting waste.

Check: How to Prepare for NSEB?

NSEB Excretion in Animals Question Practice Paper – NSEB Excretion System Questions

Excretion is an important topic in the NSEB Biology Olympiad. It covers how animals remove metabolic waste produced after physiological activities. Questions test not only memory but also your understanding of mechanisms, types of excretory products in different animals, and comparative physiology.

Practising practice papers regularly helps students strengthen their understanding and improve speed and accuracy while solving problems. Students can check the table provided below to get all the NSEB excretion in animals questions practice paper:

NSEB Biology Excretory System Practice Questions 

To ace the excretory system chapter, work through questions probing the human urinary system, osmoregulation, hormone action, kidney structure, and excretory roles of the liver, lungs, and skin.

Sample practice set:

• Explain why glucose appears in the urine of a healthy individual after consuming large amounts of sweets.

Answer: The reabsorption of glucose is concentration-dependent. When the renal threshold is exceeded, excess glucose is excreted in urine.​

• What role do nephridia play in annelids?

Answer: Nephridia are tubular excretory structures that filter and expel wastes from the animal’s body.

• How do marine teleost fishes manage excess salt intake?

Answer: They excrete excess salt through specialized chloride cells in their gills and produce small volumes of concentrated urine.

NSEB Animal Excretion Numerical Problems

Numerical test application skills in interpreting data, graphs, or tables related to the excretory system.

Sample numerical:

• The table below shows toxicity, energy cost, and water loss for three nitrogenous wastes (P, Q, R). Identify each:

P: Highest toxicity, lowest energy cost, highest water loss.

Q: Medium values for each.

R: Lowest toxicity, highest energy cost, lowest water loss.

Option: P = Ammonia, Q = Urea, R = Uric acid.​

• A mouse, sheep, and elephant have different surface area to volume ratios and oxygen consumption. Identify which has the highest metabolic rate per gram.

Answer: Mouse, due to the high S/V ratio and weight-specific oxygen consumption.​

NSEB Previous Year Excretion Questions

Going through previous years’ question papers boosts your understanding of commonly tested subtopics and question trends. Question papers and answer keys are available online. Regular practice with these helps you judge time management, identify weak areas, and build exam stamina.

​ Focus on:

• Comparing mechanisms of excretion in fish, amphibians, reptiles, and mammals.

• Structure and function of the nephron, types of urine formation.

• Problem-based questions on osmoregulation, especially involving marine and terrestrial animals.

Benefits of Solving NSEB Important Biology Excretion Practice Set

Set aside time every week to attempt a dedicated excretion practice set.Make sure to time yourself and review mistakes post-practice for maximum improvement.​

 Include:

• MCQs based on facts (e.g., organs, excretions)

• Questions involving diagrams (e.g. labelling of nephrons).

• Application questions (numericals, real-life examples)

• Forms of assertion-reasoning and match-the-following.

NSEB Exam Pattern

It is important to know the pattern of the latest exam. The test comprises all the major topics of Class 11 and 12 biology, but takes into consideration such areas as cell structure, physiology (including excretion), diversity and ecology. 

• Questions: 80 questions in multiple-choice form.

• Duration: 2 hours (120 minutes)

• Language: English or Hindi (to be chosen at registration)

• Marking Scheme: +3, -1 on each correct and incorrect answer, respectively.

• Mode: Pen-and-paper 

Advantages of NSEB Excretion in Animals Practice Paper

There are several benefits of using the NSEB Excretion in Animals question papers for students:

• It assists in the comprehension of the variations in excretory systems between the groups of animals (ammonotelic, ureotelic, uricotelic) and the evolutionary changes considering their habitat and water supply, which is vital during the competitive exams. 

• The students are made aware of the advantages of each excretory process, e.g. water conservation in excretion of uric acid by birds and reptiles, energy efficiency in simple diffusion in invertebrates, and more accurate osmoregulation in mammals via the kidney. 

• Practice papers are more effective in solving problems, translating the concepts of biology to the real world, and remembering the distinctions in excretion processes in animals, which consequently increases performance in the exam.

How to Prepare for NSEB 

Preparation should be done by following the following steps:

• Begin with Class 11 and 12 NCERT chapters about the excretory system and other issues.

• Do lots of MCQs, numericals, and assertion-reasoning questions of the previous papers.

• Test using the answer key to analyze the common errors to narrow the problem-solving strategies. 

• Develop a study schedule and schedule periodic self-assessment sessions.

• Talk to peers or mentors about difficult questions and clarify everything immediately.

• Do not overlook rest and revision--do not go too fast.