{"id":3653,"date":"2023-01-03T04:40:49","date_gmt":"2023-01-03T04:40:49","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=3653"},"modified":"2023-01-31T07:01:09","modified_gmt":"2023-01-31T07:01:09","slug":"ncert-solutions-class-8-science-chapter-10-reaching-the-age-of-adolescence","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science-chapter-10-reaching-the-age-of-adolescence\/","title":{"rendered":"NCERT Solutions Class 8 Science Chapter 10 Reaching the Age of Adolescence"},"content":{"rendered":"<h2 style=\"text-align: center;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">NCERT Solutions Class 8 Science\u00a0<\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">The NCERT Solutions in English Language for Class 8 Science <strong>Chapter &#8211; 10 (Reaching the Age of Adolescence) <\/strong>has been provided here to help the students in solving the questions from this exercise.<\/span><\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">Chapter &#8211; 10 (Reaching the Age of Adolescence)<\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>1. What is the term used for chemical secretions of endocrine glands responsible for changes taking place in the body?<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>Hormones is the term used for chemical secretion of endocrine glands responsible for changes taking in the body. Hormones are chemical messengers that transport signals from one cell (or gland) to another cell (or gland).<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>\u00a02. Define adolescence.<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>Adolescence is a period of life when body undergoes changes leading to reproductive maturity. It is the Period between 11 to 19 years There are also other physical and emotional changes that occur during this period.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3. What is menstruation? Explain.<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>Menstruation is a process in which blood and mucous flows out every month through the vagina. Menstruation usually lasts for 3 to 5 days in human females. The frequency of menstrual cycle in human females is once in a month if egg is not fertilized.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>4. List changes in the body that take place at puberty.<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>The changes in the body of puberty are: <\/span><\/p>\n<ul>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Sudden increase in height. <\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">The bones of arms and legs elongate and make a person tall. <\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Growing of hair at different parts of body. <\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">The voice of a boy gets hoarsed. <\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Development of sex organs. <\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Growth of moustaches and beards in the boys.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5. Prepare a Table having two columns depicting the names of endocrine glands and hormones secreted by them.<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Answer &#8211;<\/strong><\/span><\/p>\n<div class=\"table-responsive\" style=\"text-align: justify;\">\n<table class=\"table table-bordered\">\n<tbody>\n<tr>\n<td><span style=\"color: #000000;\"><strong>Endocrine Glands<\/strong><\/span><\/td>\n<td><span style=\"color: #000000;\"><strong>Hormones<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color: #000000;\">Testis<\/span><\/td>\n<td><span style=\"color: #000000;\">Testosterone<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color: #000000;\">Ovary<\/span><\/td>\n<td><span style=\"color: #000000;\">Oestrogen<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color: #000000;\">Pituitary<\/span><\/td>\n<td><span style=\"color: #000000;\">Growth hormone<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color: #000000;\">Adrenal<\/span><\/td>\n<td><span style=\"color: #000000;\">Adrenalin<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color: #000000;\">Thyroid<\/span><\/td>\n<td><span style=\"color: #000000;\">Thyroxin<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"color: #000000;\">Pancreas<\/span><\/td>\n<td><span style=\"color: #000000;\">Insulin<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>6. What are sex hormones? Why are they named so? State their function.<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong><\/span><span style=\"color: #000000;\">The chemical substances produced by the sex organs are called sex hormones. For example, in females, the sex hormone produced by the ovary is called oestrogen and in males, the sex hormone produced by the testis is called testosterone. <\/span><span style=\"color: #000000;\">Some of the functions performed by the sex hormones:<br \/>\n<\/span><span style=\"color: #000000;\"><strong>Oestrogen &#8211; <\/strong>This hormone is responsible for the development of secondary sexual characteristics in females, like enlargement of breasts, development of female reproductive organs, etc.<br \/>\n<\/span><span style=\"color: #000000;\"><strong>Testosterone &#8211; <\/strong>This hormone develops secondary sex characteristics in boys, such as the growth of beard, the voice becoming hoarse, the development of the reproductive organs, etc.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>7. Choose the correct option.<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>(a) Adolescents should be careful about what they eat, because<br \/>\n<\/strong><\/span><span style=\"color: #000000;\">(i) proper diet develops their brains.<br \/>\n<\/span><span style=\"color: #000000;\">(ii) proper diet is needed for the rapid growth taking place in their body.<br \/>\n<\/span><span style=\"color: #000000;\">(iii) adolescents feel hungry all the time.<br \/>\n<\/span><span style=\"color: #000000;\">(iv) taste buds are well developed in teenagers.<br \/>\n<strong>Answer &#8211;\u00a0<\/strong>(ii) proper diet is needed for the rapid growth taking place in their body.<br \/>\n<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>(b) Reproductive age in women starts when their<br \/>\n<\/strong><\/span><span style=\"color: #000000;\">(i) menstruation starts.<br \/>\n<\/span><span style=\"color: #000000;\">(ii) breasts start developing.<br \/>\n<\/span><span style=\"color: #000000;\">(iii) body weight increases.<br \/>\n<\/span><span style=\"color: #000000;\">(iv) height increases.<br \/>\n<strong>Answer &#8211;\u00a0<\/strong>(i) menstruation starts.<br \/>\n<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>(c) The right meal for adolescents consists of<br \/>\n<\/strong><\/span><span style=\"color: #000000;\">(i) chips, noodles, coke.<br \/>\n<\/span><span style=\"color: #000000;\">(ii) chapati, dal, vegetables.<br \/>\n<\/span><span style=\"color: #000000;\">(iii) rice, noodles and burger.<br \/>\n<\/span><span style=\"color: #000000;\">(iv) vegetable cutlets, chips and lemon drink.<br \/>\n<\/span><span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong><\/span><span style=\"color: #000000;\">(ii) chapati, dal, vegetables.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>8. Write notes on\u2014<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>(a)<\/strong> Adam\u2019s apple.<br \/>\n<\/span><span style=\"color: #000000;\"><strong>(b)<\/strong> Secondary sexual characters.<br \/>\n<\/span><span style=\"color: #000000;\"><strong>(c)<\/strong> Sex determination in the unborn baby.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Answer &#8211;<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>(a) Adam\u2019s apple &#8211; <\/strong>The protruding part in the throat is called Adam&#8217;s apple. It is the enlarged voice box or larynx. It makes the voice of boys coarse.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>(b) Secondary sexual characters &#8211; <\/strong>The characters which help to distinguish the male from female are called secondary sexual characters. The characters like hair on chest under arms, development of breast, beard and moustaches are called secondary sexual characters.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>(c) Sex determination in the unborn baby &#8211; <\/strong>The sex of unborn baby is determined by the sex chromosomes. An unfertilized egg always has X chromosomes. Sperms are of two types. One contains X chromosomes and the other contains Y chromosomes. If sperm contributes a Y chromosome to the egg at fertilisation, the zygote would develope into male child. If a sperm containing X chromosome fertilises the egg, the zygote would develop into a female.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>9. Word game :<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Use the clues to work out the words.<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>Across<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>3.<\/strong> Protruding voice box in boys<br \/>\n<\/span><span style=\"color: #000000;\"><strong>4.<\/strong> Glands without ducts<br \/>\n<\/span><span style=\"color: #000000;\"><strong>7.<\/strong> Endocrine gland attached to brain<br \/>\n<\/span><span style=\"color: #000000;\"><strong>8.<\/strong> Secretion of endocrine glands<br \/>\n<\/span><span style=\"color: #000000;\"><strong>9.<\/strong> Pancreatic hormone<br \/>\n<\/span><span style=\"color: #000000;\"><strong>10.<\/strong> Female hormone<br \/>\n<\/span><span style=\"color: #000000;\"><strong>Down<br \/>\n<\/strong><\/span><span style=\"color: #000000;\"><strong>1.<\/strong> Male hormone<br \/>\n<\/span><span style=\"color: #000000;\"><strong>2.<\/strong> Secretes thyroxine<br \/>\n<\/span><span style=\"color: #000000;\"><strong>3.<\/strong> Another term for teenage<br \/>\n<\/span><span style=\"color: #000000;\"><strong>5.<\/strong> Hormone reaches here through blood stream<br \/>\n<\/span><span style=\"color: #000000;\"><strong>6.<\/strong> Voice box<br \/>\n<\/span><span style=\"color: #000000;\"><strong>7.<\/strong> Term for changes at adolescence<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3716\" src=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Q9.png\" alt=\"NCERT Class 8 Solutions Science\" width=\"525\" height=\"550\" srcset=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Q9.png 525w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Q9-286x300.png 286w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Q9-480x503.png 480w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><br \/>\n<\/span><span style=\"color: #000000;\"><strong>Answer &#8211;<br \/>\n<\/strong><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3715\" src=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans9.png\" alt=\"NCERT Class 8 Solutions Science\" width=\"529\" height=\"552\" srcset=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans9.png 529w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans9-288x300.png 288w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans9-480x501.png 480w\" sizes=\"auto, (max-width: 529px) 100vw, 529px\" \/><br \/>\n<\/span><\/p>\n<p style=\"text-align: justify;\"><strong>10. The table below shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs?<br \/>\n<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td rowspan=\"2\">Age (Years)<\/td>\n<td colspan=\"2\">Height (cm)<\/td>\n<\/tr>\n<tr class=\"table-cell-blue\">\n<td>Boys<\/td>\n<td>\u00a0Girls<\/td>\n<\/tr>\n<tr>\n<td>0<\/td>\n<td>53<\/td>\n<td>53<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>96<\/td>\n<td>92<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>114<\/td>\n<td>110<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>129<\/td>\n<td>133<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>150<\/td>\n<td>150<\/td>\n<\/tr>\n<tr>\n<td>20<\/td>\n<td>173<\/td>\n<td>165<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\"><strong>Answer &#8211;<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3717\" src=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans10.png\" alt=\"NCERT Class 8 Solutions Science\" width=\"974\" height=\"986\" srcset=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans10.png 974w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans10-296x300.png 296w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans10-768x777.png 768w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-10-Ans10-480x486.png 480w\" sizes=\"auto, (max-width: 974px) 100vw, 974px\" \/><br \/>\n<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<table style=\"width: 100%; border-collapse: collapse;\" border=\"1\">\n<tbody>\n<tr style=\"height: 32px;\">\n<td style=\"width: 100%; background-color: #f2e079; text-align: center; height: 32px;\"><span style=\"color: #ff0000; font-size: 14pt;\"><strong>NCERT Class 8<sup>th\u00a0<\/sup>Solution\u00a0<\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-english\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 English\u201d (Edit)\">NCERT Solutions Class 8 English<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-hindi\/\" aria-label=\"\u201cNCERT Solutions Class 6 Maths\u201d (Edit)\">NCERT Solutions Class 8 Hindi<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-maths\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Maths\u201d (Edit)\">NCERT Solutions Class 8 Mathematics<\/a>\u00a0<\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><a href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-sanskrit-ruchira\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\">NCERT Solutions Class 8 Sanskrit<\/span><\/strong><\/span><\/a><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Social Science\u201d (Edit)\">NCERT Solutions Class 8 Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-social-science\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Social Science\u201d (Edit)\">NCERT Solutions Class 8 Social Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions Class 8 Science\u00a0 The NCERT Solutions in English Language for Class 8 Science Chapter &#8211; 10 (Reaching the Age of Adolescence) has been provided here to help the students in solving the questions from this exercise. Chapter &#8211; 10 (Reaching the Age of Adolescence) 1. What is the term used for chemical secretions [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[535],"tags":[555,556,538,5],"class_list":["post-3653","post","type-post","status-publish","format-standard","hentry","category-class-8-science","tag-ncert-class-8-science-chapter-10-reaching-the-age-of-adolescence-in-english","tag-ncert-solutions-class-8-science-chapter-10-in-english","tag-ncert-solutions-class-8-science-in-english","tag-ncert-solutions-in-english"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.9 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Solutions Class 8 Science Chapter 10 Reaching the Age of Adolescence | TheExamPillar NCERT<\/title>\n<meta name=\"description\" content=\"NCERT Solutions Class 8 Science\u00a0The NCERT Solutions in English 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