{"id":16496,"date":"2022-06-04T01:00:03","date_gmt":"2022-06-03T19:30:03","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=16496"},"modified":"2023-01-25T11:05:39","modified_gmt":"2023-01-25T05:35:39","slug":"selina-icse-solutions-class-9-biology-skin-jack-trades","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-biology-skin-jack-trades\/","title":{"rendered":"Selina Concise Biology Class 9 ICSE Solutions Skin- “The Jack of All Trades”"},"content":{"rendered":"
APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 9 Biology Chapter 9 Chapter 13 Skin”The Jack Of All Trades”. You can download the Selina Concise Biology ICSE Solutions for Class 9 with Free PDF download option. Selina Publishers Concise Biology for Class 9 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n
Download Formulae Handbook For ICSE Class 9 and 10<\/a><\/p>\n ICSE Solutions<\/a>Selina ICSE Solutions<\/a><\/p>\n Selina ICSE Solutions for Class 9 Biology Chapter 13 Skin- “The Jack of All Trades”<\/strong><\/p>\n Exercise 1<\/strong><\/span><\/p>\n Solution A.<\/strong><\/span><\/p>\n Solution B.1.<\/strong><\/span><\/p>\n Hypothalamus, a portion of the forebrain is the principal body heat regulating centre in our brain.<\/p>\n Solution B.2.<\/strong><\/span><\/p>\n Modified sweat gland: Mammary gland Solution B.3.<\/strong><\/span><\/p>\n Sebaceous glands<\/p>\n Solution C.1.<\/strong><\/span><\/p>\n Functions of the mammalian skin other than those concerned with heat regulation:<\/p>\n Solution C.2.<\/strong><\/span><\/p>\n A peculiar roughness of the skin produced by cold or fear, in which the hair follicles become erect and form bumps on the skin is called goose flesh.<\/p>\n Goose flesh occurs when the muscles at the base of hair known as erectors or arrectors, contract. The erector muscles are obliquely placed between the hair follicle and the outer part of dermis. They are smooth muscles that are necessary to move the hair. The contraction of erector muscle pulls the hair vertical and depresses the epidermis, resulting in goose flesh.<\/p>\n Solution C.3.<\/strong><\/span><\/p>\n Man is a warm-blooded mammal. Our body must maintain an average temperature of 98.6 degree Fahrenheit to function properly. When we feel too hot or too cold, our nervous system sends certain automatic and autonomic reflexes that help to keep us warm. In cold weather, the blood vessels<\/a> get narrowed (vasoconstricted). Shivering occurs when our muscles expand and contract rapidly to produce extra body heat. The amount of heat produced is increased by increased metabolic rate and muscular activity, which occurs in the form of shivering. That is why, our body shivers and teeth chatter to protect from cold by generating more heat.<\/p>\n Solution C.4.<\/strong><\/span><\/p>\n\n
\nModified sebaceous gland: Ceruminous gland<\/p>\n\n