Describe the structure and functioning of nephron.
What are the methods used by plants to get rid of excretory products?
How is the amount of urine produced regulated?
The kidneys in human beings are a part of the system for
Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
Name the process used by single-celled organisms for taking in food, exchange of gases or removal of wastes.
Give the name of nitrogenous waste produced in birds. In what form is it eliminated?
Which of the nitrogenous waste is most soluble in water?
Why is right kidney placed slightly lower in position as compared to the left kidney?
Which substance is selectively reabsorbed by the tubular part of nephron?
What causes the liquid part of blood to filter out from glomerulus into the renal tubule?
Out of about 170L of fluid filtered by the kidneys everyday. How much is excreted in urine?
How much urine is passed by a human adult in 24 hours?
The volume of glomerular filtrate produced is 180L, but the volume of urine excreted is just 1-2L. Give suitable reason for this statement.
From which substance urea is formed in the liver?
How is urea removed from human body?
Name the substance which is present at a higher concentration in renal artery than in renal vein.
The four structures listed below are the part of human excretory system. Urinary bladder, kidney, ureter, urethra.
In which order does a molecule of urea pass through these structures?
Why is urine yellow in colour?
Why is it said that kidneys help in the process of osmoregulation? Explain.
(i) When glucose is present in the urine of a person.
(ii) When increased excretory volume of urine is passed by a person.
What will happen, if one kidney of a person is removed?
Name the process which helps in artificial removal of wastes from the body.
In artificial kidney, which substance passes from the blood to the dialysis fluid?
Name two excretory products in plants other than oxygen and carbon dioxide.
How do some deciduous plants throw out excretory matter?
What is excretion? How do unicellular organisms remove their wastes?
Organisms are classified on the basis of nitrogenous waste excreted by them. Explain.
What are the waste materials eliminated by our body? How are they generated?
Write in brief the function of the following structures.
(i) Kidney (ii) Ureter
(iii) Urinary bladder (iv) Urethra
Complete the labelling of the diagram marked as A-D.
What is the main function of kidneys in humans?
The diagram shows the structures associated with a human kidney. Identify W, X, Y and Z.
Write the function of the following :
(i) Renal artery (ii) Renal vein
(i) What are the main toxic wastes that kidney filters from the blood?
(ii) Name any two substances, which are selectively reabsorbed from the tubules of a nephron.
How is urine produced?
What happens to glucose that enters the nephron along the filtrate?
Name the gas produced during photosynthesis? Also mention the way by which it is removed from plants.
Which substances are found in the glomerular filtrate in the kidneys of a mammal? Also name the substance that fails to pass the glomerulus.
What is the basic unit of the kidney called? Why it is composed of a cluster of very thin-walled blood capillaries?
Give reason for ammonia is converted to uric acid crystals directly in uricotelic organisms?
What will happen if there is sudden shortage of water in the body?
It is said that a working dialysis machine is similar to a normal healthy kidney. How?
Observe the following table carefully and match the components of part I with part II of the table. Write them in complete sentences.
Name the filtering unit of kidney and why is it called so?
(i) Excretion and Egestion
(ii)Urea and Urine
(i) Write the important functions of the structural and functional unit of kidney.
(ii) Write any one function of an artificial kidney.
Define excretion. Write two vital functions of kidney.
Major amount of water is selectively reabsorbed by the tubular part of nephron. On what factor does the amount of water reabsorbed depend?
Name the factors on which the amount of water reabsorbed along the tubular part nephron depends.
State the functions of (i) renal artery (ii) kidney and (iii) urinary bladder.
What is the role of following in excretion by various organisms?
(i) Leaves (ii)Glomerulus (iii) Ureter
Explain the location, structure and functions of kidney in human beings. Also draw an appropriate diagram supporting your answer.
(i) Draw the structure of a nephron and label the following parts on it.
(a) Renal artery (b) Bowman's capsule
(c) Glomerulus (d) Collecting duct
(ii) Name four substances in the initial filtrate which are selectively reabsorbed as the filtrate floor along the tubule.
(i) Draw a neat diagram of the human excretory system and label following parts.
(a) Urethra (b) Kidney
(c) Ureter (d) Urinary bladder
(ii) What are nephrons? How is a nephron involved in the filtration of blood and formation of urine?
Draw a diagram of excretory unit of a human kidney and label the following.
(a) Bowman's capsule (b) Glomerulus
(c) Collecting duct (d) Renal artery
Draw the structure of a nephron and label on it the following parts.
(a) Glomerulus (b) Bowman's capsule
(c) Renal artery (d) Collecting duct
Describe the process of urine formation in kidneys.
Plants excrete waste products from their body by various means. Justify the above statement.
A figure given below shows a diagram of kidney and its associated structures. The table list the percentage of certain components found within the structures A and B.
(i) Using only the information given in the tables, deduce the functions of the kidney.
(ii) Explain how the proportions of components present in part B would change if a person is suffering from diabetes mellitus.
(i) Name the waste products of metabolism and for each waste product, state which organ removes it from the blood.
(ii) Why is the removal of faeces from the alimentary canal not considered to be excretion?
Rishi, a student of class XI had a habit of drinking very less water. His parents and teachers, often explained him the ill-effects of this habit, but he did not cared. One day while studying in the classroom he suffered from severe pain in abdominal area. Teacher immediately called the doctor and his parents. The doctor recommended him to go for an ultrasound by which he deduced that Rishi had stones in his kidney.
Answer the following questions:
(i) What according to you are kidney stones?
(ii) How Rishi developed stones in his kidney? What are its symptoms?
(iii) What values were shown by Rishi's teacher?
Aman was feeling short of breath, weak and pain in abdomen since few days. He told this to his friend Rohit, who took him to a doctor. After all check-ups the doctor deduced that his left kidney is not working properly, i.e. not filtering the blood in a proper way due to which the nitrogenous wastes are accumulating or building up in the body and right one is fully damaged. Doctor advised him to go for kidney transplantation.
Hearing this, Rohit decided to donate a kidney to his friend so that he can survive normally, but after all the check-ups, doctor refused for the transplantation.
Read the given passage and answer the following questions:
(i) Write the causes of kidney failure.
(ii) What values were shown by Rohit?
Sanjeev was an owner of a factory which produces some varnishes and other substances. One day Sanjeev along with his friend decided to visit a forest to collect natural and fresh resins and gums from the trees of the forest to produce some useful substances for his factory. On the basis of above text, answer the following questions.
(i) What are gums and resins?
(ii) What are the uses of these substances?
(iii) What values are shown by Sanjeev?
Waste products of plants are useful for human beings. Is it true? Explain.