Skin The Jack of All Trades Very Short 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 Very Short 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 B. Very Short Answer Type |
| Academic Session | 2023-2024 |
B. Very Short Answer Type
Skin The Jack of All Trades Class-9 Biology Concise Solutions
Page 141
Question 1.
Name:
(a) Two principal components of mammalian skin.
(b) Two main layers of skin proper.
(c) Three regions/sublayers of epidermis.
(d) Five derivatives of skin.
(e) Two abnormal conditions of skin pigmentation.
Answer:
(a) Skin proper and derivatives of skin.
(b) Epidermis and dermis.
(c) Three regions/sublayers of epidermis are :
- Stratum corneum (Cornified outermost layer)
- Granular layer (middle layer)
- Malpighian stratum (Malpighian layer or Germinative layer)
(d) Five derivatives of skin are :
- Hair
- Nail
- Mammary gland
- Sweat gland
- Sebaceous gland.
(e) Albinism, Leukoderma
Question 2.
Complete the following sentences:
(a) The contraction of …………… muscle pulls the hair to a somewhat vertical position.
(b) The oily secretion …………… makes the skin waterproof.
(c) …………… of the skin is composed of flattened dead cells.
(d) The hard outer part of the nail is termed as ……………
(e) …………… glands open on the margins of the eyelids.
Answer:
(a) The contraction of erector muscle pulls the hair to a somewhat vertical position.
(b) The oily secretion sebum makes the skin waterproof.
(c) Cornified layer of the skin is composed of flattened dead cells.
(d) The hard outer part of the nail is termed as plate.
(e) Meibomian glands open on the margins of the eyelids.
Question 3.
Correct the following statements by changing only the first or the last word.
(a) Keratin protects us from ultraviolet rays.
(b) Vitamin E can be synthesized when skin is exposed to sunlight.
(c) Black heads are caused due to hormonal influence and inflammation of the sebaceous gland.
(d) Ceruminous glands are modified sweat glands.
(e) The optimum temperature for enzymatic activity in our body is 41°C to 45°C.
Answer:
(a) Melanin protects us from ultraviolet rays.
(b) Vitamin D can be synthesized when skin is exposed to sunlight.
(c) Acne are caused due to hormonal influence and inflammation of the sebaceous gland.
(d) Ceruminous glands are modified sebaceous glands.
(e) The optimum temperature for enzymatic activity in our body is 35°C to 40°C.
— : End of Skin The Jack of All Trades B. Very Short Answer Class-9 ICSE Biology Solutions :–
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