Observe the following image and answer the following questions (i) Identify the figure. (ii) State two functions of the figure. (iii) Label A-C. Cannot connect to Ginger Check your internet connection or reload the browser Disable in this text field Edit Edit in Ginger Edit in Ginger ×

Hair is a protein filament that grows from follicles found in the dermis. (i) The given figure is of a hair follicle. (ii) The functions of hair include protection and regulation of body temperature. (iii) The parts given in the figure are as follows- A. Hair. B. Sebaceous gland. c. Follicle.

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.

Observe the figure and answer the question. Label the parts A-C.

A-Hair shaft: It is the part of the hair that can be seen on the skin. It is made of a protein called keratin. It traps a layer of air to provide insulation. B-Sebaceous glands: They are also called oil glands. They are the oil-secreting glands of our body. The substance secreted by them is called sebum. C-Hair follicle: It is a tunnel-shaped structure present in the dermis layer of the skin. This is the part from which the hair starts growing. It is nourished by the blood.

Match the following columns: Column I Column II A. Vasoconstriction 1. Mammals B. Meissner's corpuscles 2. Less flow of blood in the blood vessel C. Pacinian corpuscles 3. Oily secretion D. Sebaceous gland 4. Sense of pressure E. Endothermal 5. Sense of touch

A - 2 Vasoconstriction means narrowing of the blood vessels which reduces the volume or space inside the affected blood vessels and hence the blood vessel volume is lowered, blood flow is also reduced. At the same time, the resistance or force of blood flow is also raised. This causes higher blood pressure. This process is essential for maintaining body temperature in homeotherms. B - 5 Meissner corpuscles consist of a cutaneous nerve ending responsible for transmitting the sensations of touch. Meissner corpuscles are most sensitive to low-frequency vibrations between 10 to 50 Hertz and can respond to skin indentations of less than 10 micrometres. C - 4 The skin contains many sensory receptors. Pacinian corpuscles are nerve endings in the skin responsible for sensitivity to high-frequency vibration and deep pressure. D -3 The Sebaceous glands are lobulated glands consisting of many sacs that open into hairy follicle by a common duct. The epithelium layer of these glands secretes an oily secretion called sebum. It lubricates the hair, makes skin oily and waterproof and also prevents drying of the skin. E - 1 Human beings belong to the class Mammalia and are warm-blooded animals. Endothermal means warm-blooded animals whose body temperature remains the same irrespective of the outside temperature. Column I Column II A. Vasoconstriction 2. Less flow of blood in the blood vessel B. Meissner's corpuscles 5. Sense of touch C. Pacinian corpuscles 4. Sense of pressure D. Sebaceous gland 3. Oily secretion E. Endothermal 1. Mammals

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Hair follicle is the visible portion of hair.

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Important Questions on The Skin

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Science>Biology>The Skin>Skin Derivatives

A root hair is formed by

EASY

Science>Biology>The Skin>Skin Derivatives

Observe the following image and answer the following questions

(i) Identify the figure.
(ii) State two functions of the figure.
(iii) Label A-C.

Question Image

EASY

Science>Biology>The Skin>Skin Derivatives

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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Science>Biology>The Skin>Skin Derivatives

Identify the correct statements from the following:

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Science>Biology>The Skin>Skin Derivatives

Fill in the blank with the correct option given in the bracket.

In human, different exoskeleton organs such as nail, hair, etc., are formed by _____. (cutinisation, keratinisation, lignification)

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Science>Biology>The Skin>Skin Derivatives

Question Image

State one main function of the following part:

Part 9

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Science>Biology>The Skin>Skin Derivatives

What are the three parts of human nails?

HARD

Science>Biology>The Skin>Skin Derivatives

Write structure and function of hair found on skin.

EASY

Science>Biology>The Skin>Skin Derivatives

Observe the figure and answer the question.
Question Image

Label the parts A-C.

EASY

Science>Biology>The Skin>Skin Derivatives

How do hair provide the sensation of touch?

EASY

Science>Biology>The Skin>Skin Derivatives

Hair also provides a sensation of touch.

HARD

Science>Biology>The Skin>Skin Derivatives

Facial hair in humans contributes to sex differences.

EASY

Science>Biology>The Skin>Skin Derivatives

What is "Goose flesh"? How is it brought about.

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Science>Biology>The Skin>Skin Derivatives

Which of the following grows from the follicles that is found in the dermis?

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Science>Biology>The Skin>Skin Derivatives

Describe oily glands found in human skin.

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Science>Biology>The Skin>Skin Derivatives

Match the following columns:

Column I	Column II
A. Vasoconstriction	1. Mammals
B. Meissner's corpuscles	2. Less flow of blood in the blood vessel
C. Pacinian corpuscles	3. Oily secretion
D. Sebaceous gland	4. Sense of pressure
E. Endothermal	5. Sense of touch

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Science>Biology>The Skin>Skin Derivatives

The roots of our hairs are alive, but the rest of our hair is dead, why?

HARD

Science>Biology>The Skin>Skin Derivatives

Which are derivatives of human skin, Describe?

EASY

Science>Biology>The Skin>Skin Derivatives

The statement given below has some part printed in boldface. Rewrite only in the case that part is in an incorrect form.

Facial hair in humans contributes to sex differences.

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Science>Biology>The Skin>Skin Derivatives

Pigmented granules in hair are found in

Hair follicle is the visible portion of hair.

Important Questions on The Skin

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