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प्रश्न
Explain in your own words with suitable examples.
How does excretion occur in human beings?
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उत्तर
- The excretory system removes wastes from the body, which is an important function.
- The human excretory system is made up of two kidneys, two ureters, the urine bladder, and the urethra. The kidneys produce urine by removing waste and undesirable chemicals from the bloodstream.
- Nephrons are the functional units of the kidney that perform the basic function of filtration. The urea generated in the liver enters the bloodstream.
- When urea-containing blood enters the glomerulus, it is filtered by capillaries, removing urea and other related compounds.
- Water molecules and tiny molecules of other substances can pass through the semipermeable membrane of Bowman's capsule.
- The fluid that has accumulated in the Bowman's capsule cavity enters the nephron's tubular portion. Here, water molecules and other important compounds are reabsorbed into the bloodstream.
- Urine is generated from the residual fluid, which contains waste elements. The ureters carry urine, which is then stored in the urinary bladder. Urine is then released through the urethra.
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संबंधित प्रश्न
How is the amount of urine produced regulated?
Match structures given in Column I with functions given in Column II.
| Column I | Column II | ||
| (i) | Stomata | (a) | Absorption of water |
| (ii) | Xylem | (b) | Transpiration |
| (iii) | Root hairs | (c) | Transport of food |
| (iv) | Phloem | (d) | Transport of water |
| (e) | Synthesis of carbohydrates |
Bile, Urea, Uric acid, Ammonia
Name the basic filtration unit present in the kidney.
Differentiate between the following pair on the basis of what is indicated in the bracket.
Ureter and Urethra [function]
Why do some people need to use a dialysis machine? What does the machine do?
How are waste products excreted in Amoeba?
Explain the principle of dialysis with the help of a labelled diagram.
Tick the most appropriate answer.
The process of removing waste from the body is called
Answer the following in short.
List five waste products of plants.
In summer the urine is slightly thicker than in winter explain the reason.
Given below is a simplified diagram of the human kidney cut open longitudinally. Answer the questions that follow.
 |
- Define excretion.
- Why does the cortex of the kidney show a dotted appearance?
- Why does the medulla of the kidney show a striped appearance?
- Write two differences in the composition of the blood flowing through the blood vessels 'A' and 'B'.
Explain the difference between the excretory system of humans and plants.
Given below is a highly simplified diagram of the human kidney cut open longitudinally. Answer the question that follow:
Mention two functions of the kidney.
Complete the following sentence with appropriate word:
______ is the functional unit of kidney.
Choose the correct option.
In human beings, uric acid is formed due to metabolism of ______.
Answer the following question.
State the role of liver in urea production.
“All plants give out oxygen during the day and carbon dioxide during the night”. Do you agree with this statement? Give a reason.
Given below is a list of substances - select the ones that need to be eliminated from the body.
Glucose, excess water, amino acids, urea, carbon dioxide, excess common salt, glycogen, uric acid.
