(b) Volume: 1 -1-5 litre per day but varies. Micturition 13. As the filtrate passes down the tubule, much of the water is reabsorbed together with the usable substances. Previous Year Question Papers NCERT Solutions Click Here. (v) Loop of Henle. Question 4: Why urine is acidic while blood is alkaline ? The Bowman’s capsule 2. Answer: (i) Excretion is the process of removal of all harmful and unwanted products especially nitrogenous products from the body of living beings. (v) Two differences in the composition of blood flowing through blood vessels A and B are: (a) A contains blood having large amount of water and nitrogenous wastes while blood in B is thicker and free from toxic substances. Renal arteries 9. Answer: (i) (j)   (ii) (e)   (iii) (f)   (iv) (h)   (v) (c)   (vi) (a)   (vii) (i)   (viii) (b), ICSE Previous Year Question Papers Class 10, ICSE Solutions for Class 10 Biology – The Excretory System, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions. Study the diagram and answer the ahead questions: (i) Label parts 1,2,3 and 4. (iii) 8. Study the same and then answer the questions that follow: (i) Name the parts labeled 1, 2,3, and 4. 10. Answer: Excretion is the removal of all harmful and unwanted products (specially the nitrogenous – products) from the body of living beings. Left kidney, 2. dorsal aorta, 3. right ureter, 4. urinary bladder, 5. urethra. Answer: Question 3: Afferent arteriole and Efferent arteriole. Question 3: Sketch and label the structure of malphigian body. (iii) Adrenal gland—At the top of kidney. (ii) Name the parts labeled 1, 2,3 and 4. (False, Urine leaves the urinary bladder of a female by means of the urethra.) March 04, 2020. Proximal convoluted tubule with blood capillaries. Diagrams are one of the most scoring questions in the Science Paper. The organ in man concerned with maintaining water balance in the body. 4. Question 4: Why is urine yellow in colour ? Loop of Henle 4. Such animals are called ureotelic animals. Question 5: Describe about physical properties of urine. Glomerulus: A single afferent arteriole of the renal artery breaks up into a number of capillary branches to form the glomerulus. (iii) Name the blood vessel which contains the least amount of urea in this diagram. Answer: (i) (1) Collecting tubule (2) Distal convoluted tubule (3) Loop of Henle. The Bowman’s capsule is a double-walled cup-like structure which lies in the cortex of the kidney. Renal corpuscle 7. Ureotelism 7. 15. A carries CO2 and no nitrogenous products. Ammonia, salts, urea, uric acid etc. Name the substance found in excess in the urine of a diabetic person. (iv) Two functions of kidney are: (a) It expels out all the nitrogenous products produced in the body. Question: 1. Vasopressin or Antidiuretic Hormone [ADH] 16. The organ in which urine is stored before its elimination. That is why the urine is slightly thicker in summer than winter. Ureter 12. This high pressure causes the liquid part of the blood to filter out from the glomerulus into the renal tubule (ultrafiltration). Answer: Metabolic activities of all living things produce more waste materials. (Carbonic acid) 9. 3. Question: 1. Answer: Diagram of human excretory system. (iii) Name the endocrine gland which could be added in diagram and state its location/position. 13. The filtrate now passes through Henle’s loop where selective reabsorption of useful products takes place but urea and uric acid are not absorbed. The gas excreted by the lungs. Question 6: Write constituents of urine. Question 9: How does hydrostatic pressure develop in the glomerulus ? Kidneys 2. Question 12: “Urine is formed from alkaline blood, but it is acidic in nature”. (False, Ammonia is converted into urea in liver.) (False, Harmful ammonium compounds formed during the metabolism in the cells are broken down to form urea in the liver.) (4) Bowman capsule. (v) Name the two major steps involved in the formation of the fluid that passes down the part labeled ‘3’. The term used for Bowman’s capsule and glomerulus together. Distal convoluted tubule with blood capillaries Study the diagram and answer the following questions in each case: (i) Where does ultrafiltration take place ? (Kidney) 2. Urea 6. (True). How do you calculate the total resistance of a series circuit? Uric acid and water 8. The final changes in the composition and the volume of the nephric filtrate occurs in the loop of Henle and the distal convoluted loop of the tubule. Answer: (i) Renal cortex (ii) 1. Afferent arteriole, Efferent arteriole, Vasa recta, Glomerulus. Answer: It is necessary to maintain a normal osmotic concentration of blood to keep the body cells in a steady state (proper working condition). Answer: Physical properties of urine: (a) Colour: Straw-yellow colour (due to presence of urochrome). Glucose, Question: The organ which filters out urea and uric acid from the blood stream. Answer: Except urine, all others listed are secretions, because secretion is giving out by a cell or gland some substances that have some utility for the body. You can use black / blue pen to write the parts of the diagram but use a pencil only to draw the structure. So more blood is entering and less blood is moving out of the glomerulus. Question 3: Think of the following: Tears, sweat, saliva, milk, Insulin, urine. Glucose, Amino acids, Urea, Na+. Answer: (i) 3.