Skin The Jack of All Trades Structured Answer Biology Class-9 ICSE Selina Publishers

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

            Vertical section of the mammalian skin

Question 2.

Given below is a diagrammatic sketch of the vertical section of the human skin.

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.

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.

—  : End of Skin The Jack of All Trades E. Structured/Application Answer Class-9 ICSE Biology Solutions :–

Return to  Return to Concise Selina ICSE Biology Class-9 

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