Biology
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.
Skin
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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.
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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.
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.
Define
(a) Skin
(b) Piloerection
(c) Heatstroke
(d) Perspiration
(e) Stratum malpighi
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