Match the items in Column I with those in Column II Column I Column II (i) Air Spaces a. Hair (ii) Mammary gland b. Sebaceous glands (iii) Goose Flesh c. Rudimentary in males (iv) Tracers of urea d. Races of hot countries (v) More numerous sweet pores e. Grey hair (vi) Oily Secretion f. Sweat

(i)-e The gray hair is due to minute airspace formed in the hair when the pigments lost. The colour of the hair is due to varying quantities of melanin. (ii)-c Mammary glands are modified sweat glands. These glands are found in both males and females. But in males it is rudimentary. (iii)-a During winter or during emotion, hairs on the skin gets lifted called piloerection. This is to trap air and act as a shield to prevent the cold air to enter inside the body. (iv)-f Urea is found in sweat, out of total urea excreted from the body just 1% is excreted through sweating. Sweat consists of about 99 per cent water, 0.2 to 0.5 per cent salts (mainly sodium chloride) and traces of urea (0.08 per cent). (v)-d Outer opening on the skin for sweating is called a sweat pore. It is estimated that the total number of sweat pores is 2 million. But people of hot countries, sweat pores are more in number. It helps in cooling the body by evaporation. (vi)-b Sebaceous glands is one of the derivative of the skin. It gives out an oily secretion that make the hair and outer surface of the skin oily and waterproof. This prevents the loss of water by evaporation. Column I Column II (i)Airspace e. Grey hair (ii)Mammary gland c. Rudimentary in males. (iii)Goose Flesh a. Hair (iv)Traces of urea f. Sweat (v)More numerous sweats pores d. Races of hot countries. (vi)Oily secretion b. Sebaceous glands.

E M B I B E

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">REVIEW QUESTIONS>Q E

EASY

9th ICSE

IMPORTANT

Earn 100

Draw a labeled diagram of the generalized vertical section of the mammalian skin.

Important Questions on Skin - "The Jack of All Trades"

EASY

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 1

List four ways in which the skin serves as a protective layer for our body.

EASY

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 2

Which among the following in the items in the following list are not the function of human skin.

Sensation, respiration, storage of glycogen, excretion, digestion, temperature regulation, synthesis of vitamin-D, secretion of the hormone.

MEDIUM

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 1

Name the three sub-layers of the epidermis from outer to inner.

EASY

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 2

Stratum corneum is made up of dead cells having keratin.

EASY

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 2

The malpighian layer is hard and resistant to bacterial invasion.

EASY

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 2

The pigment melanin which imparts colouration to the skin is found in the malpighian layer.

EASY

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 2

The dermis is very thick on palms and soles.

EASY

9th ICSE

IMPORTANT

Concise Biology Part - 1>Chapter 16 - Skin - "The Jack of All Trades">PROGRESS CHECK>Q 1

Match the items in Column I with those in Column II

Column I	Column II
(i) Air Spaces	a. Hair
(ii) Mammary gland	b. Sebaceous glands
(iii) Goose Flesh	c. Rudimentary in males
(iv) Tracers of urea	d. Races of hot countries
(v) More numerous sweet pores	e. Grey hair
(vi) Oily Secretion	f. Sweat

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