Skin The Jack of All Trades Structured Answer Biology Class-9 ICSE Selina Publishers Solutions Chapter-13. Step By Step ICSE Selina Concise Solutions of Chapter-13 Skin The Jack of All Trades with Exercise-13 including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type and Structured/Application Questions Solved . Visit official Website CISCE for detail information about ICSE Board Class-9.
Skin The Jack of All Trades Exe-13 Structured Answer Biology Class-9 ICSE Concise Selina Publishers
Board | ICSE |
Publications | Selina Publication |
Subject | Biology |
Class | 9th |
Chapter-13 | Skin The Jack of All Trades |
Book Name | Concise |
Topics | Solution of E. Structured/Application/Skill Answer Type |
Academic Session | 2023-2024 |
E. Structured/Application/Skill Answer Type
Skin The Jack of All Trades Class-9 Biology Concise Solutions
Page 142
Question 1.
Draw a labelled diagram of the generalized vertical section of the mammalian skin.
Answer:
Vertical section of the mammalian skin
Question 2.
Given below is a diagrammatic sketch of the vertical section of the human skin.
(a) Label the parts numbered from 1 to 9.
(b) State one main function of each of the following parts :
(i) Part 2.
(ii) Part 3.
(iii) Part 4.
(iv) Part 9.
(c) Name any one of the above parts which has at least three functions.
(d) Part 4 may add to one’s good appearance or the “figure”. State one example of this function which may be common to both men and women.
Answer:
(a)
1: Sweat pore
2: Sebaceous gland
3: Sweat gland
4: Fat
5: Dermis
6: Stratum malpighian
7: Stratum corneum
8: Epidermis
9: Hair
(b)
Function of part 2 (Sebaceous gland):
It produces oil called sebum, which plays a role in keeping our skin moist.
Function of part 4 (Fat):
The skin reserves food in the form of a layer of fat.
Function of part 3 (Sweat gland):
It secretes a transparent liquid (sweat) containing water and salts from the body in order to regulate body temperature.
Function of part 9 (Hair):
Hair provide a sensation of touch and are also helpful in forensic investigations.
Part which has at least three functions:
Sebaceous gland:
(i) Skin protection
(ii) Secretes an oily substance known as sebum that lubricates hair and skin of mammals
(iii) Presence of sebum enables to experience a wet skin even when we have not taken bath for days
(c) The one function which may be common to both men and women is that the fat serves as a food reserve and heat insulating layer as well as a shock absorber.
Question 3.
The figures A and B given below represent the ways of heat regulation in our body with the help of blood vessels. Study the figures and answer the following questions.
(a) Name the process/condition shown in figures A and B.
(b) During what climatic conditions, do these processes occur in our body?
(c) What colour change do we see in the facial appearance of a person during these situations?
(d) Do these situations occur due to emotional causes? If yes, name them.
Answer:
(a) The process/condition shown in figures A and B are :
- A → Vasoconstriction
- B → Vasodilation
(b) Vasoconstriction occurs in cold climatic conditions. Vasodilation occurs in hot climatic conditions.
(c) The facial appearance of a person becomes pale or bluish during vasoconstriction and reddish during vasodilation.
(d) These situations may occur due to fright, nervousness or sudden emotion.
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