Skin The Jack of All Trades Very Short Biology Class-9 ICSE Selina Publishers

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 :–

Return to  Return to Concise Selina ICSE Biology Class-9 

Thanks

Please share with your friends

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.