Karnataka 1st PUC Biology Chapter 16 Excretory Products And Their Elimination Important Questions

Chapter 16 of Karnataka 1st PUC Biology, Excretory Products and Their Elimination, explains how different organisms remove metabolic wastes from their bodies. It covers types of nitrogenous wastes, the human excretory system, nephron structure, urine formation and the regulation of kidney function.

Understanding the processes of filtration, reabsorption and secretion is important for answering questions from this chapter. These Karnataka 1st PUC Biology Chapter 16 Important Questions cover key concepts through MCQs to help students revise the chapter and practise for their examinations.

Important Questions for Karnataka 1st PUC Biology Chapter 16

Important questions for Karnataka 1st PUC Biology Chapter 16 covers nitrogenous waste profiles, kidney anatomy, nephron functions, urine formation, counter-current mechanisms and excretory system disorders.

You can also refer to the Karnataka Board Class 11 Biology syllabus to review the subject coverage for the academic session.

Q1: An X-ray of the lower abdomen shows a shadow in the region of the ureter suspected to be an ureteric calculus. A possible clinical symptom would be

(A) acute renal failure (ARF)

(B) anuria and haematuria

(C) motor aphasia

(D) chronic renal failure (CRF)

Q2: A large quantity of fluid is filtered every day by nephrons in the kidneys. Only about 1% of it is excreted as urine. The remaining 99% of the filtrate

(A) is stored in the urinary bladder

(B) is reabsorbed into the blood

(C) gets collected in the renal pelvis

(D) is lost as sweat

Q3: The characteristic(s) common to urea, uric acid and ammonia is/are

(i) They are nitrogenous waste

(ii) They all need very large amount of water for excretion

(iii) They are all equally toxic

(iv) They are produced in the kidneys

(A) (i), (iii) and (iv)

(B) (i) only

(C) (i) and (iii)

(D) (i) and (iv)

Q4: Which one of the following statements in regard to the excretion by the human kidneys is correct?

(A) Descending limb of loop of Henle is impermeable to water.

(B) Distal convoluted tubule is incapable of reabsorbing Na+ ions.

(C) Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules.

(D) Ascending limb of loop of Henle is impermeable to electrolytes. 

Q5: Waste products of adenine and guanine metabolism are excreted by man as

(A) Ammonia

(B) Urea

(C) Uric acid

(D) Allantois

Q6: In man, the urea is mainly produced in

(A) Liver

(B) Kidney

(C) Gall bladder

(D) Spleen

Q7: Aquatic reptiles are

(A) Ammonotelic

(B) Ureotelic

(C) Uricotelic

(D) None of these

Q8: The major nitrogenous waste(s) in the respective animals is/are

(A) Urea and uric acid in cow, frog and lion.

(B) Uric acid in parrot, cockroach and garden lizard.

(C) ammonia in elephant, sea horse and turtle.

(D) Urea in Scorpio, earthworm and shark. 

Q9: A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of

(A) Fats

(B) Amino acids

(C) Glucose

(D) Ketones

Q10: In glomerulus of rabbit (RATIOINALISED)

(A) Afferent glomerular capillary is wider than efferent glomerular capillary.

(B) Afferent glomerular capillary is narrower than efferent glomerular capillary.

(C) Afferent glomerular arteriole is narrower than the efferent glomerular arteriole.

(D) Afferent glomerular arteriole is wider than the efferent glomerular arteriole. 

Karnataka 1st PUC Biology Chapter 16 Question Bank PDF

Students preparing for the 2026–27 academic session can refer to the chapter-wise Biology question material released by the Department of School Education (Pre-University), Government of Karnataka. The Karnataka 1st PUC Biology Chapter 16 Important Questions PDF includes MCQs for classroom discussion and additional practice.

For additional exam practice, students can also refer to the Karnataka 1st PUC Biology Model Question Paper. The Karnataka Board 1st PUC Biology Chapter 16 Question Bank PDF is also useful for revising important concepts through chapter-wise MCQs.

Benefits of Using Excretory Products and Their Elimination Important Questions

Practising chapter-wise MCQs helps students understand the human excretory system, identify the functions of different nephron parts and revise the processes involved in urine formation.

The Excretory Products and Their Elimination 1st PUC Biology Important Questions provide a structured way to review the chapter and assess conceptual understanding.

1. Helps Understand the Human Excretory System

Questions on kidney anatomy, the structure of nephrons and different excretory organs help students understand how the body removes metabolic wastes.

They also cover the functions of Bowman's capsule, PCT, Henle's loop, DCT and collecting ducts. Students can refer to the Karnataka 1st PUC syllabus while planning their chapter-wise revision.

2. Builds Clarity About Urine Formation

Glomerular filtration, selective reabsorption and tubular secretion are the three major processes involved in urine formation. Questions on these processes help students understand how filtrate is formed and how useful substances are returned to the blood. The counter-current mechanism and the role of Henle's loop are also important areas for revision.

3. Improves Understanding of Kidney Regulation

ADH, aldosterone, the renin-angiotensin-aldosterone system (RAAS) and atrial natriuretic factor (ANF) regulate different aspects of kidney function. Practising questions on these mechanisms helps students understand how the body maintains water balance, blood pressure and the glomerular filtration rate.

Referring to the Karnataka 1st PUC exam pattern can also help students understand the examination structure.

4. Makes Self-Assessment Easier

The 1st PUC Biology Chapter 16 Questions and Answers PDF format of the material makes it useful for practising and reviewing answers. Students can also solve Karnataka 1st PUC mid-term question papers with answer keys to assess their preparation.

The Karnataka 1st PUC Excretory Products and Their Elimination Questions PDF can support revision of topics such as nitrogenous wastes, nephron functions, urine formation and excretory disorders.

Excretory Products and Their Elimination covers the processes through which organisms remove metabolic wastes and maintain internal balance.

Revise the types of nitrogenous wastes, kidney structure, urine formation, hormonal regulation and excretory disorders, and practise MCQs from the official question bank. These Karnataka 1st PUC Biology Chapter 16 Important Questions can support your chapter revision and help you identify topics that need further practice.