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The Excretory System

Home / Board / ICSE / important Questions / Class 10 / Biology / The Excretory System

Class 10 Biology Chapter 8
The Excretory System
Important Questions

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Here, you’ll find important questions related to Chapter 8 The Excretory System For ICSE Class 10 Biology. These questions have been crafted to assist students in their preparation for the ICSE Class 10 Biology Examination in 2024–25. By practising various question types, students can clarify their doubts, enhance their exam readiness, boost their confidence, and refine their problem-solving skills.

Introduction

The Excretory System is a vital component of the human body, responsible for the removal of waste and excess substances to maintain a healthy internal environment. In the intricate world of biology, understanding this system is crucial, especially for students in Class 10 ICSE. The study of the excretory system not only deepens our comprehension of how our bodies function but also provides valuable insights into the broader field of biology. In this chapter on the ICSE Class 10 Biology curriculum, we will delve into the intricacies of the excretory system. We will explore its various components, including the kidneys, ureters, bladder, and urethra, as well as the processes of filtration, reabsorption, and secretion. To aid in your comprehensive understanding, we have compiled a collection of biology questions for Class 10 ICSE, specifically focusing on the excretory system. These important questions for Class 10 ICSE Biology serve as valuable tools to assess and reinforce your knowledge, ensuring you are well-prepared for your examinations. As we journey through the ICSE Class 10 Biology chapter on the excretory system, we invite you to explore the intricacies of waste management in the human body and uncover the answers to the important questions of biology Class 10 ICSE related to this essential physiological process. Join us in unravelling the mysteries of the excretory system and enrich your understanding of the fascinating world of biology.

What is The Excretory System ?

The excretory system is a critical physiological system in the human body responsible for the elimination of waste products and excess substances to maintain a healthy internal environment. Its primary function is to filter blood, remove metabolic waste products, regulate the balance of essential chemicals in the body, and control the volume and composition of body fluids. ‍
Key organs and structures within the excretory system include:
  • Kidneys: These bean-shaped organs are the primary filtration units of the excretory system. They filter blood to remove waste products, excess ions, and water, producing urine as the end product.
  • Ureters: The ureters are narrow tubes that transport urine from the kidneys to the bladder.
  • Bladder: The bladder is a muscular sac that stores urine until it is ready to be expelled from the body.
  • Urethra: This tube carries urine from the bladder to the exterior of the body during the process of urination.
The excretory system also plays a role in maintaining the body’s balance of electrolytes, such as sodium and potassium, and helps regulate blood pressure. Additionally, it is involved in the elimination of certain drugs and toxins from the body.Overall, the excretory system is essential for maintaining homeostasis within the body, ensuring that waste products and harmful substances are efficiently removed, and the internal environment remains stable and conducive to the proper functioning of the body’s cells and organs.
65940c471757a8478ca776c9 ICSE Chapter 8 01 1

Class 10 Biology The Excretory System Important Questions and Answers

Q1. The thicker part of the blood, left behind after ultrafiltration and is carried by efferent arteriole. The following are the constituents:
Options
(a) Urea, corpuscles, proteins
(b) Two kinds of corpuscles, proteins, and large molecules
(c) Glucose, proteins, urea
(d) Water, proteins, urea, corpuscles

Ans. (b) Two kinds of corpuscles, proteins, and large molecules

Explanation:
The thicker part of the blood, left behind after ultrafiltration and is carried by efferent arteriole. The thicker part of blood consists of two kinds of corpuscles, proteins, and large molecules.

Q2. Give reason why the urine is slightly thicker in summer than winter.
Options
(a) Due to consumption of more water
(b) Water is lost through sweat during summer
(c) During summer more water is reabsorbed
(d) Both (b) and (c)

Ans. (d) Both (b) and (c)

Explanation:
During summer water is lost from the body through sweat, more water is reabsorbed from proximal and distal convoluted tubules to maintain balance. Hence urine is slightly thicker in summer than in winter.

Q3. State the Location of Urinary bladder

Explanation:
Urinary bladder is located in the pelvic cavity, posterior to the symphysis pubis, and below the parietal peritoneum.

Q4. As a result of ultrafiltration, along with excretory products certain useful products like glucose, salt etc. are also filtered but are not excreted why

Explanation:
Glucose, salt etc. in the glomerular filtrate are reabsorbed in the proximal part of renal tubule.

Q5. Write constituents of urine.

Explanation:
Constituents of urine : The normal human urine consists of about 95% of water and 5% of solid wastes dissolved in it. The percentage of the solid wastes may slightly vary according to the food taken and according to the time after taking food but usually these are approximately as follows :

Organic Constituents in (g/L)Inorganic Constituents in (g/L)
Urea – 2.3Sodium chloride - 9.0
Creatinine – 1.5Potassium chloride 2.5
Uric acid – 0.7Potassium chloride 2.5
Others – 2.6Ammonia 0.6
Others - 2.5
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ICSE Class 10 Biology Chapter wise Important Questions

Conclusion

The excretory system is an indispensable component of the human body, responsible for the vital task of eliminating waste and maintaining internal balance. As you navigate the complexities of the excretory system in your studies, remember that resources like Oswal.io offer a valuable treasure trove of knowledge. Their comprehensive collection of questions and educational materials provides an excellent aid in your quest to understand the intricacies of the excretory system and biology in general.

Frequently Asked Questions

Ans: The human excretory system includes all the organs involved in the elimination of wastes such as salts, carbon dioxide and urea produced by the body during homeostasis.
Ans: The important human excretory organs are- kidneys, ureter, urethra, urinary bladder, skin, liver, intestine and lungs.
Ans: The most important fact about the excretory system is that the human bladder can hold up to 400 ml of urine. The blood gets filtered by the kidneys 400 times daily. When the bladder gets filled completely, nerves send the signal to the brain, and we feel the urge to urinate.
Ans: The steps included in the elimination of wastes are- glomerular filtration, reabsorption, and secretion. These processes remove only excess water and waste from the body.
Ans: The important functions performed by the excretory system include- elimination of wastes, eliminate waste byproducts excreted by the cells, prevent the accumulation of harmful chemicals in the body, and maintain a balanced chemical concentration in the body.
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