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

NCERT Solutions for Class 11 Biology Chapter 19 Excretory Products and their Elimination are provided in the article below. It covers all the important definitions, concepts, and methodologies that will be really beneficial for the students. The important topics that are included in this chapter are:

Expected no. of Questions: 1-2 questions of around 2 marks.

Download PDF: NCERT Solutions for Class 11 Biology Chapter 19 Excretory Products and their Elimination

NCERT Solutions for Class 11 Biology Chapter 19

Class 11 Biology Chapter 19 Excretory Product and Their Elimination: Important Topics

Excretion is the biological process by which an organism rids itself of the excess waste products and the nitrogenous by-products of metabolism through the urethra. Moreover, through this process, organisms control osmotic pressure - the balance between inorganic ions and water - and maintain acid-base balance. In this way, homeostasis is promoted, the constancy of the organism’s internal environment.

Modes of Excretion

There are five modes of excretion found in animals based on the excretory product. They are:

Ammonotelism (Type of excretion- ammonia)
Ureotelism (Type of excretion – urea)
Uricotelism (Type of excretion – uric acid)
Aminotelism (Type of excretion – amino acids)
Guanotelism (Type of excretion – guanine)

Human Excretory System

Human Excretory System is that in complex organisms including humans, there is a specialized system for excretion. The human excretory system comprises organs that facilitate the removal of nitrogenous wastes from the body.

The human excretory system organs include:

A pair of kidneys:
A pair of ureters:
A urinary bladder:
A urethra:

Urine Formation

In the human body, the kidneys filter unwanted substances from the blood and excrete them in the form of urine. There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion. All these three processes ensure that only waste and excess water are removed from our body.

Chapter Related Links:

Human Excretory System	Function of the tubules	Mechanism of concentration of the filtrate
Ammonotelism	Role of other organs in excretion	Micturition
Osmoregulation	Urine Formation	Atrial Fibrillation

CBSE Class 11 Biology Study Guides:

CBSE Class 11 Biology Syllabus	CBSE Class 11 Biology NCERT Textbook	CBSE Class 11 Biology Sample Paper
Biology Study Material	Biology MCQs	Difference between in Biology

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