{"id":21917,"date":"2024-02-23T16:19:33","date_gmt":"2024-02-23T10:49:33","guid":{"rendered":"https:\/\/icsesolutions.com\/?p=21917"},"modified":"2024-02-24T10:04:30","modified_gmt":"2024-02-24T04:34:30","slug":"selina-concise-biology-class-7-icse-solutions-excretion-in-humans","status":"publish","type":"post","link":"https:\/\/icsesolutions.com\/selina-concise-biology-class-7-icse-solutions-excretion-in-humans\/","title":{"rendered":"Selina Concise Biology Class 7 ICSE Solutions &#8211; Excretion in Humans"},"content":{"rendered":"<h2><strong><span style=\"color: #00ccff;\">Selina Concise Biology Class 7 ICSE Solutions &#8211; Excretion in Humans<\/span><\/strong><\/h2>\n<p><a class=\"button-red\" title=\"ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/icsesolutions.com\/icse-solutions\/\">ICSE Solutions<\/a><a class=\"button-blue\" title=\"Selina Concise ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/icsesolutions.com\/selina-concise-icse-solutions\/\">Selina ICSE Solutions<\/a><a class=\"button-blue\" title=\"ML Aggarwal ICSE Solutions for Class 7 Maths\" href=\"https:\/\/icsesolutions.com\/ml-aggarwal-icse-solutions-for-class-7-maths\/\">ML Aggarwal Solutions<\/a><\/p>\n<p>ICSESolutions.com provides step by step solutions for Selina Concise ICSE Solutions for Class 7 Biology. You can download the Selina Concise Biology ICSE Solutions for Class 7 with Free PDF download option. Selina Publishers Concise Biology for Class 7 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n<p><a class=\"button-red\" title=\"Selina Concise Biology Class 7 ICSE Solutions\" href=\"https:\/\/icsesolutions.com\/selina-concise-biology-class-7-icse-solutions\/\">Selina Class 7 Biology ICSE Solutions<\/a><a class=\"button-blue\" title=\"Selina Concise Chemistry Class 7 ICSE Solutions\" href=\"https:\/\/icsesolutions.com\/selina-concise-chemistry-class-7-icse-solutions\/\">Chemistry<\/a><a class=\"button-blue\" title=\"Selina Concise Physics Class 7 ICSE Solutions\" href=\"https:\/\/icsesolutions.com\/selina-concise-physics-class-7-icse-solutions\/\">Physics<\/a><a class=\"button-blue\" title=\"Selina Concise Mathematics Class 7 ICSE Solutions\" href=\"https:\/\/icsesolutions.com\/selina-concise-mathematics-class-7-icse-solutions\/\">Maths<\/a><a class=\"button-blue\" title=\"ICSE Solutions for Class 7 Geography Voyage\" href=\"https:\/\/icsesolutions.com\/icse-solutions-class-7-geography-voyage\/\">Geography<\/a><a class=\"button-blue\" title=\"ICSE Solutions for Class 7 History and Civics\" href=\"https:\/\/icsesolutions.com\/icse-solutions-class-7-history-and-civics\/\">History &amp; Civics<\/a><\/p>\n<p><strong>Selina Concise ICSE Solutions for Class 7 Biology Chapter 5 Excretion in Humans<\/strong><\/p>\n<p><strong>Synopsis \u2014<\/strong><\/p>\n<ul>\n<li>\u00a0<strong>The substances which should be excreted are :<\/strong>\n<ol>\n<li>urea, uric acid<\/li>\n<li>\u00a0Bile pigments<\/li>\n<li>water<\/li>\n<li>extra salts such as sodium<\/li>\n<li>chloride extra vitamins.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<ul>\n<li>The vitamins passed out into urine if in excess are <strong>vitamin B and C.<\/strong><\/li>\n<li>\u00a0The kidneys are situated towards the back of the abdomen at the level of last two ribs.<\/li>\n<li>\u00a0Right kidney is located at slightly lower level than the left kidney.<\/li>\n<li>The ureters run from the kidney to the urinary bladder and urethra runs from urinaiy bladder to the exterior.<\/li>\n<li><strong>Accessory excretory organs are<\/strong>\n<ol>\n<li>\u00a0skin<\/li>\n<li>lung<\/li>\n<li>liver<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<ul>\n<li>\u00a0The main function of the skin is to cool the body.<\/li>\n<li>\u00a0Liver converts highly toxic ammonia produced in the body to less toxic urea.<\/li>\n<li>\u00a0Liver eliminates cholesterol, bile pigments, extra vitamins, and many durgs.<\/li>\n<li>\u00a0The amount of urine produced by the glomerular filtrate after reabsorption per day is <strong>1.2 litre.<\/strong><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><span style=\"color: #3366ff;\"><strong>(Review Questions)<\/strong><\/span><\/p>\n<p><strong>MULTIPLE CHOICE QUESTIONS :<\/strong><br \/>\n<strong>1. Put a tick mark (\u2713) against the most appropriate alternative in the<br \/>\n<\/strong><strong>following statements :<br \/>\n<\/strong><br \/>\n<strong>(i) The kidneys are made up of tiny tubular units called :<\/strong><br \/>\n(a) glomerulus<br \/>\n<strong>(b) nephrons<\/strong><br \/>\n(c) capillaries<br \/>\n(d) neurons<\/p>\n<p><strong>(ii) In human beings, urea is produced in :<\/strong><br \/>\n<strong>(a) liver<\/strong><br \/>\n(b) kidney<br \/>\n(c) spleen<br \/>\n(d) urinary bladder<\/p>\n<p><strong>(iii) Besides water, the urine mainly contains :<\/strong><br \/>\n<strong>(a) urea<\/strong><br \/>\n(b) nitric acid<br \/>\n(c) glucose<br \/>\n(d) bile pigments<\/p>\n<p><strong>(iv) Filtration of excretory wastes from the blood occurs in:<\/strong><br \/>\n(a) collecting tubule<br \/>\n(b) ureter<br \/>\n(c) urinary bladder<br \/>\n<strong>(d) nephrons<\/strong><\/p>\n<p><strong>Short Answer Questions<\/strong><br \/>\n<strong>1. Fill in the blanks :<\/strong><\/p>\n<ol>\n<li>Nitrogenous wastes in the urine are in the form of urea and <strong>uric acid.<\/strong><\/li>\n<li>The unit of human kidney is called <strong>nephron.<\/strong><\/li>\n<li>\u00a0Evaporation of sweat from skin surface has <strong>cooling<\/strong> effect.<\/li>\n<\/ol>\n<p><strong>2. Define the following:<\/strong><br \/>\n(i) Excretion:<br \/>\n(ii) Excretory organs :<br \/>\n(iii) Dialysis :<br \/>\n(iv) Nephron:<br \/>\n<strong>Ans.<br \/>\n(i) Excretion :<\/strong> During different metabolic activities taking place in our body, the body produces many substances of which some are useful and some are useless.<br \/>\nThe process of removal of useless and harmful metabolic waste substances is called excretion.<br \/>\n<strong>(ii) Excretory organs :<\/strong> During different metabolic activities taking place in our body, the body produces many substances of which some are useful and some are useless.<br \/>\nIf retained in the body the unwanted substances may become poisonous and cause much harm and in severe cases, even death. The organs which remove these unwanted and toxic substances from the body are called excretory organs.<br \/>\n<strong>(iii) Dialysis :<\/strong> The artificial process which cleans and filters the blood in a person where one or both the kidney may stop working properly is called dialysis.<br \/>\n<strong>(iv) Nephron :<\/strong> Inside the kidney, there are millions of microscopic tubes called renal tubules or nephrons. It is the structural and functional unit of kidney.<\/p>\n<p><strong>3. Write True (T) or False (F) for the following statements in the spaces provided. Rewrite the false statements in correct form.<\/strong><\/p>\n<ol>\n<li>Removal of solid undigested food is excretion<br \/>\n<strong>False<\/strong><br \/>\n<strong>Correct:<\/strong> Removal of solid undigested food is egestion.<\/li>\n<li>\u00a0Medulla of kidney passes urine into urinary bladder.<br \/>\n<strong>False<\/strong><br \/>\n<strong>Correct<\/strong>: Medulla of kidney passes urine into funnel-like pelvis.<\/li>\n<li>\u00a0Excess sugar in blood is a symption ofdiabetes.<br \/>\n<strong>True<\/strong><\/li>\n<li>\u00a0Urine is devoid of blood cells.<br \/>\n<strong>True<\/strong><\/li>\n<\/ol>\n<p><strong>4. Name the blood vessel that brings blood to the kidneys.<\/strong><br \/>\n<strong>Ans.<\/strong> Renal Artery<\/p>\n<p><strong>5. Where in the urinary system do the following processes take place ?<\/strong><br \/>\n<strong>Ans.<\/strong><\/p>\n<ol>\n<li>Urine formation: <strong>kidneys.<\/strong><\/li>\n<li>\u00a0Transport of urine away from kidney: <strong>urethra.<\/strong><\/li>\n<li>\u00a0Temporary storage of urine : <strong>urinary bladder.<\/strong><\/li>\n<\/ol>\n<p><strong>Long Answer Question<\/strong>s<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 1.<\/span><\/strong><br \/>\nDefine excretion. Write the four organs of human urinary system in their correct sequence.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe process of elimination of unwanted and toxic products from the body is called excretion.<br \/>\nThe four organs of the urinary system from above to downward are:<\/p>\n<ol>\n<li>kidneys<\/li>\n<li>\u00a0ureter .<\/li>\n<li>urinary bladder<\/li>\n<li>\u00a0urethera.<\/li>\n<\/ol>\n<p><strong><span style=\"color: #eb4924;\">Question 2.<\/span><\/strong><br \/>\nWhy is excretion necessary in living beings ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe excretion is necessary because the toxic products if allowed to be retained in the body act as poison and cause great harm to the body. If they exceed the threshold, they may even cause death.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 3.<\/span><\/strong><br \/>\nWhat is meant by osmoregulation ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe process of maintaining accurate concentration of water and salts in the body is called osmoregulation.<br \/>\nThis is done by the kidneys.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 4.<\/span><\/strong><br \/>\nDescribe the structure of kidney with the help of a labelled diagram.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-73841\" src=\"https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Biology-Class-7-ICSE-Solutions-Excretion-in-Humans-1.png?resize=511%2C343&#038;ssl=1\" alt=\"Selina Concise Biology Class 7 ICSE Solutions - Excretion in Humans 1\" width=\"511\" height=\"343\" srcset=\"https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Biology-Class-7-ICSE-Solutions-Excretion-in-Humans-1.png?w=511&amp;ssl=1 511w, https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Biology-Class-7-ICSE-Solutions-Excretion-in-Humans-1.png?resize=300%2C201&amp;ssl=1 300w\" sizes=\"(max-width: 511px) 100vw, 511px\" data-recalc-dims=\"1\" \/><br \/>\n<\/strong><\/span><\/p>\n<p><strong>Section through the kidney to show different regions The kidneys is composed of:<\/strong><\/p>\n<ol>\n<li>\u00a0an outer darker area called <strong>Cortex<\/strong><\/li>\n<li>\u00a0an inner lighter area called <strong>Medulla.<\/strong><\/li>\n<\/ol>\n<p>The microscopic structure of kidney is formed of millions of tubules called renal tubules or nephrons.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 5.<\/span><\/strong><br \/>\nWhat are the two ways by which a person can get relief in case of kidney failure ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe two ways by which a person can get relief in case of kidney failure are:<\/p>\n<ol>\n<li>Dialysis: this is a method in which an artificial machine cleans and filters the blood.<\/li>\n<li>\u00a0The patient can undergo kidney transplant.<\/li>\n<\/ol>\n<p><strong><span style=\"color: #eb4924;\">Question 6.<\/span><\/strong><br \/>\nDraw a diagram of human excretory system and label the following parts : Kidney, ureter, urinary bladder and urethra.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-73842\" src=\"https:\/\/i2.wp.com\/icsesolutions.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Biology-Class-7-ICSE-Solutions-Excretion-in-Humans-2.png?resize=400%2C344&#038;ssl=1\" alt=\"Selina Concise Biology Class 7 ICSE Solutions - Excretion in Humans 2\" width=\"400\" height=\"344\" srcset=\"https:\/\/i2.wp.com\/icsesolutions.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Biology-Class-7-ICSE-Solutions-Excretion-in-Humans-2.png?w=400&amp;ssl=1 400w, https:\/\/i2.wp.com\/icsesolutions.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Biology-Class-7-ICSE-Solutions-Excretion-in-Humans-2.png?resize=300%2C258&amp;ssl=1 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" data-recalc-dims=\"1\" \/><\/strong><\/span><\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 7.<\/span><\/strong><br \/>\nHow are kidney stones formed ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nKidney stones are formed when crystal forming substances such as calcium oxalate, calcium phosphate and uric acid are<br \/>\nmore than the fluid in the urine. When these chemicals start sticking together, they from crystals, commonly called kidney stones. They may be formed and cause severe plain.<\/p>\n<p><strong><span style=\"color: #eb4924;\">Question 8.<br \/>\n<\/span><\/strong> What are the symptoms of an urinary tract infection ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>\u00a0Common symptoms include a strong and frequent urge to urinate, and a painful and burning sensation while urinating.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Selina Concise Biology Class 7 ICSE Solutions &#8211; Excretion in Humans ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions ICSESolutions.com provides step by step solutions for Selina Concise ICSE Solutions for Class 7 Biology. You can download the Selina Concise Biology ICSE Solutions for Class 7 with Free PDF download option. Selina Publishers Concise Biology for Class &hellip;<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3034],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/21917"}],"collection":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/comments?post=21917"}],"version-history":[{"count":1,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/21917\/revisions"}],"predecessor-version":[{"id":167773,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/21917\/revisions\/167773"}],"wp:attachment":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/media?parent=21917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/categories?post=21917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/tags?post=21917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}