Melanin

Q.

Keratin is the skin pigment that protects it against ultraviolet light.

1. True

2. False

Q. why our skin turns black on exposure to sunlight? (not from the lesson typed above)

Q.

Light skin and dark skin differ in:

1. Retention of melanin by the cells

2. Rate and amount of melanin produced
3. Number of melanocytes present
4. Number of epidermal cells present

Q. Skin colouration is due to a pigment called present in the cells of the layer.

1. melanin
2. granular
3. myosin
4. malpighian

Q.

The fibrous protein that is responsible for the strength and water resistance of the skin surface is

1. Keratohyalin
2. Collagen
3. Elastin
4. Keratin

Q.

What is the most important function of melanin?

1. Keep the skin cool

2. Increases the number of blood vessels
3. Absorbs harmful radiation
4. Strengthens the skin of eyes

Q.

You are a Science enthusiast, and are currently interested in studying the concept behind various kinds of complexion in the world population. You consider three individuals in a group, who have the typical looks of an African negro, an Indian, and a European. Arrange them in increasing order of the amount of melanin in their skin.

1. African, Indian, European

2. Indian, African, European

3. African, European, Indian

4. European, Indian, African

Q.

Light skin and dark skin differ in?

1. Retention of melanin by the cells

2. Rate and amount of melanin produced
3. Number of melanocytes present
4. Number of epidermal cells present

Q.

Which of the following is a genetic skin disease?

1. Vitiligo

2. Albinism

3. Leucoderma

4. All of these

Q. Assertion (A): People living in temperate zones usually have a lighter skin colour than those living in the tropical zone.​
Reason (R): The skin produces a greater amount of melanin on greater exposure to sunlight.​

1. Both A and R are true but R is not the correct explanation of A.
2. A is true but R is false.​
3. Both A and R are true and R is the correct explanation of A.​
4. A is false but R is true.​

Q.

What is the most important function of melanin?

1. Causes the skin to be cooler

2. Increases the amount of blood vessels

3. Strengthens the skin or eyes

4. Absorbs harmful radiation

Q. Colouration of the skin is due to the pigment___contained in the cells of the malphighian layer.

Q.

The melanin pigment is found in the:

1. Granular layer

2. Cornified layer

3. Dermis

4. Malpighian layer

Q. is a disorder, characterised by the absence of melanin production in the body.

1. Albinism
2. Leucoderma
3. Turner syndrome

Q. Why does direct exposure to the Sun darken the skin?

Q.

Colouration of the skin is due to the pigment named ___contained in the cells of the malphighian layer.

Q. Which pigment is responsible for the colour of skin?

Q.

What is the most important function for melanin?

1. Causes the skin to be cooler

2. Increases the amount of blood vessels
3. Strengthens the skin or eyes
4. Absorbs harmful radiation

Q. Which of the following is a genetic skin disorder?

1. Vitiligo
2. Albinism
3. Leucoderma
4. All of the above.

Q.

Colouration of the skin is due to the pigment___contained in the cells of the malpighian layer.

Q. What do you mean by melanin? List 2 abnormalities of melanin pigmentation.

Q.

Colouration of the skin is provided by

1. Melanin

2. Keratin

3. Haemoglobin

4. Collagen

Q.

What is the most important function for melanin?

1. Causes the skin to be cooler

2. Increases the amount of blood vessels

3. Absorbs harmful radiation

4. Strengthens the skin or eyes

Q. State the difference between the skin disorders A and B.

Disorder A	Disorder B

Q. The pigment melanin protects skin from

1. UV rays
2. Visible rays
3. Infrared rays
4. X-rays

Q.

What is the most important function for melanin?

1. Increases the amount of blood vessels

2. Strengthens the skin or eyes

3. Absorbs harmful radiation

4. Causes the skin to be cooler

Q.

_________ (Sunscreens/ Moisturisers) are creams that protect us from harmful sunrays.

Q.

Which of the following is responsible for the colour of hair?

1. Melanin

2. Keratin

3. Sebum

4. Acne

Q.

Light skin and dark skin differ in:

1. Rate and amount of melanin produced

2. Number of epidermal cells present

3. Retention of melanin by the cells

4. Number of melanocytes present

Q.

Colouration of the skin is due to the pigment called___.