NCERT Solutions for Class 11 Biology Chapter 19 – Excretory Products and their Elimination


NCERT solutions can help clear doubts if you go through them. They clearly explain complex concepts in Biology and even give questions at the end of each chapter so that students can become thorough.

Chapter 19 in Biology for CBSE class 11 tells you about the excretory system and the elimination of waste products from the human body. It gives a gist of how the excretory system works and the distinct functions it performs.

NCERT Solutions for Class 11 Biology Chapter 19 – Excretory Products and their Elimination

Chapter 19 talks about the excretory system and the by-products of excretion. As always, the solutions distribute the chapter into different sections, and each part explains one concept related to excretion.

The solutions also have questions at the end of the chapter, and the students can answer them to assess their knowledge. So, the solutions come as a handy tool to prepare for the exams.

You can download CBSE NCERT Solutions for Class 11 Biology  Chapter 19 from below.

Download NCERT Class 11 Biology Chapter 19 Solutions

What will you learn in NCERT Class 11 Biology Chapter 19?

Excretion is the process of removal of nitrogenous waste and other unwanted products from the body. The process is necessary to keep the insides of the body stable so that the life processes can function normally. During the process of excretion, various by-products such as ammonia, urea, and uric acid form and come out as feces.

Substances such as these accumulate through various metabolic processes that occur throughout the body. They can also form due to excessive ingestion.

The human excretory system consists of different sets of organs that help in the process. Kidneys, uterus, the urethra, and the urinary bladder are the organs that play a prominent role in excretion. Besides this, the excretory system also consists of other organs that help in excretion, including the renal artery and vein, dorsal aorta, and the pelvis, medulla, and the cortex present in the kidneys.

The kidneys have a significant role to play when it comes to the regulation of different bodily functions. For instance, they help regulate water in the body. They also help regulate arterial pressure. Besides this, kidneys help excrete waste from the body and secrete hormones like renin, which help in the regulation of renal functions.

The process of excretion occurs in three stages. In the first stage, called glomerular filtration, urine forms by the filtration of the blood. Every minute, the kidneys filter about 1100 to 1200 ml of blood. The number constitutes 20 percent of the blood that the heart pumps each minute.

Coming to the second stage, known as ‘selective reabsorption,’ the renal tube absorbs about 99 percent of the filtered blood. In this stage, water and urea get absorbed by passive transport, while sodium gets absorbed by active transport.

Similarly, other substances such as glucose and amino acids are absorbed with the help of both active and passive transport.

The last step in the formation of urine is tubular secretion. During this process, the tubules absorb certain chemicals which the glomerular capillaries do not filter out.

The urine thus formed passes through various other organs such as the Henle’s Loop, the Distal Convoluted Tube, and the Proximal Convoluted Tube, where it gets reabsorbed.

Benefits of NCERT Solutions for Biology Chapter 19

NCERT Solutions for Biology Chapter 19 for CBSE class 11 comes with a host of benefits, which you can find below.

1. Practice Questions

The solutions come with hundreds of practice questions at the end of the chapter. So, students can answer them and become confident to face the exams.

2. Solved Examples

NCERT Solutions for Chapter 19 in Biology also come with a set of example questions along with their solutions. Students can go through them to get a fair idea about how they should be writing their answers.

Thus, by going through NCERT Solutions for Biology, you stand a chance to come out in flying colors in the exams. The solutions also help you to become thorough with each concept in the chapter and enable you to answer any question that may appear in the examinations.


We have covered the complete guide on CBSE NCERT Solutions for Class 11 Biology Chapter 19 – Excretory Products and their Elimination. Feel free to ask us any questions in the comment section below.

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