ICSE CLASS 9 Biology Selina Chapter 13 Skin Questions papers
Skin Questions Papers Class 9 Biology Selina All Exercise Questions
A. MULTIPLE CHOICE QUESTIONS
[1] Choose the correct answer from the options given below:
(a) If sebaceous glands stop functioning:
(1) the body will struggle to regulate its temperature
(2) the skin may darken due to increased melanin
(3) hair growth will be hindered
(4) the skin will become dry and rough
(b) Which of the following pairs represents abnormal skin pigmentation conditions?
(1) Leukoderma, Ringworm
(2) Albinism, Leukoderma
(3) Baldness, Albinism
(4) Rickets, Baldness
(c) Which organ is primarily responsible for regulating body temperature?
(1) Heart
(2) Lungs
(3) Skin
(4) Stomach
(5) None of the above
(d) Sweat glands are found in:
(1) Epidermis
(2) Dermis
(3) Both
(4) None of the above
(e) The epidermis is notably thicker in:
(1) Eyelid
(2) Thigh
(3) Lip
(4) Palm
(f) Which sense organ belongs to the integumentary system?
(i) Eyes
(ii) Tongue
(iii) Ears
(iv) Skin
(g) Which type of tissue is responsible for fat storage in the deeper layers of the dermis?
(i) Stratified epithelium
(ii) Connective tissue
(iii) Adipose tissue
(iv) Muscular tissue
(h) What is the name of the part of the hair that is visible?
(i) Hair bulb
(ii) Hair shaft
(iii) Hair papilla
(i) Where is the primary center for temperature regulation in the body found?
(i) Hypothalamus
(ii) Cerebrum
(iii) Thalamus
(iv) Cerebellum
(j) Which reproductive hormone is associated with the function of mammary glands?
(i) Progesterone
(ii) Prolactin
(iii) Oestrogen
(iv) Testosterone
B. VERY SHORT ANSWER QUESTIONS
[1] Name: (a) Two main components of mammalian skin.
(b) Two primary layers of skin.
(c) Three regions or layers of the epidermis.
(d) Five skin derivatives.
(e) Two conditions related to skin pigmentation abnormalities.
[2] Complete the sentences:
(a) The contraction of __________ muscle raises the hair to a more upright position.
(b) The oily secretion __________ helps waterproof the skin.
(c) __________ of the skin consists of flattened dead cells.
(d) The hard outer part of the nail is referred to as __________.
(e) __________ glands are located at the edges of the eyelids.
[3] Correct the following statements by altering only the first or last word:
(a) Keratin shields us from ultraviolet rays.
(b) Vitamin E is produced when the skin is exposed to sunlight.
(c) Blackheads result from hormonal changes and inflammation of the sebaceous glands.
(d) Ceruminous glands are specialized sweat glands.
(e) The ideal temperature for enzymatic activity in our body ranges from 41ยฐC to 45ยฐC.
C. SHORT ANSWER QUESTIONS
[1] Define:
(a) Skin
(b) Piloerection
(c) Heatstroke
(d) Stratum malpighi
(e) Perspiration
(f) Hair follicle
(g) Hair shaft
[2] Distinguish between:
(a) Leukoderma/Vitiligo and Albinism.
(b) Cold-blooded and Warm-blooded animals.
(c) Vasodilation and Vasoconstriction.
(d) Hibernation and Aestivation.
(e) Pimples and Blackheads.
[3] Indicate the exact location of the following:
(a) Melanin
(b) Keratin
(c) Hypothalamus
(d) Granular layer
(e) Matrix
[4] Outline the important role(s) of:
(a) Cerumen
(b) Sebum
(c) Keratin
(d) Melanin
(e) Meibomian gland secretion
[5] Explain why:
(a) Skin is considered an accessory excretory organ.
(b) A healthy young person can perspire even in very cold conditions.
(c) Hair can be useful in forensic investigations.
[6] State two functions of mammalian skin that are unrelated to heat regulation.
[7] What is “goose-flesh,” and what causes it?
D. LONG ANSWER QUESTIONS
[1] Present a table listing the various structures found in the epidermis and dermis of human skin.
[2] Describe “vasodilation” and “vasoconstriction.” How do these processes help in regulating body temperature?
[3] Explain how our skin protects the body from:
(a) Germ entry.
(b) Excessive heat loss in extreme cold.
(c) Harmful ultraviolet radiation.
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