Class 10 Science - TELANGANA
Excretion
The chapter 'Excretion' in Class 10 Science explores how living organisms remove metabolic wastes to maintain internal balance or homeostasis. Students will study the human excretory system, specifically the structure and function of nephrons in the kidneys, the process of urine formation, and dialysis for kidney failure. The chapter also covers excretion in plants through processes like shedding, gum, and resin secretion. This is a high-scoring chapter in the Telangana (TSBSE) board exams, frequently featuring diagram-based questions and conceptual queries on renal function and dialysis.
Start Learning FreeKey Concepts
Excretion
The biological process of removing harmful metabolic nitrogenous wastes (like urea, uric acid) from the body to maintain homeostasis.
Nephron
The structural and functional unit of the kidney, consisting of the Malpighian body (Bowman's capsule and glomerulus) and renal tubules.
Urine Formation
A three-step process occurring in nephrons involving glomerular filtration, tubular reabsorption, and tubular secretion.
Hemodialysis
An artificial medical process used to filter wastes and excess water from the blood when both kidneys fail to function.
Excretion in Plants
Plants do not have specialized excretory organs; they remove wastes via transpiration, shedding leaves, bark peeling, and storing wastes as resins, gums, and tannins.
Important Formulas
Board Exam Info
In the Telangana (TSBSE) Class 10 Science board examinations, this chapter typically carries about 4 to 6 marks. Common question types include drawing and labeling the internal structure of a human kidney or a nephron, explaining the mechanism of urine formation, and short answer questions on plant excretory products or hemodialysis.
Frequently Asked Questions
What is the difference between excretion and egestion?
Excretion is the removal of metabolic waste products produced inside body cells, whereas egestion is the removal of undigested food from the alimentary canal through the anus.
Why is the left kidney placed slightly higher than the right kidney?
The left kidney is placed slightly higher because the right side of the abdominal cavity is occupied and crowded by the large liver.
What happens if both kidneys fail completely?
Total kidney failure leads to a toxic buildup of urea and wastes in the blood, which can be fatal unless treated with regular hemodialysis or a kidney transplant.
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