Assertion : Surface of skin is impervious to water. Reason : Surface of skin is covered by stratified cuboidal epithelium. * 1 point (a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) If Assertion is true but Reason is false. (d) If both Assertion and Reason are false.
Answers
Answer:
Solution : Surface of skin is impervious to water because it is covered by stratified keratinised squamous epithelium. ... Heavy deposits of the insoluble protein keratin are present in the dead superficial layers which makes this epithelium impervious to water.
Explanation:
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The correct option is (c) If Assertion is true but Reason is false.
Assertion : Surface of skin is impervious to water.
Surface of the skin is impervious to water, therefore this is the correct statement.
Reason : Surface of skin is covered by stratified cuboidal epithelium.
Surface of the skin is covered by stratified squamous epithelium and not stratified cuboidal epithelium as given here. Hence, this statement is false.
The epithelial tissue in the skin is arranged in many layers, hence it is called the stratified epithelium.
Cuboidal epithelium is present in the lining of kidney tubules as well as ducts of salivary glands.
Surface of skin is impervious to water because-
- The squamous epithelial tissue present in the skin is keratinized. This keratin protein is insoluble in water.
- As the skin has stratified epithelium, insoluble keratin is deposited in multiple layers.
- Hence, the skin becomes impervious to water.