Leather is obtained from-

Correct Answer: B

Rationale: The correct answer is B: Dermis. Leather is obtained from the dermis layer of animal skin, where the collagen fibers are tightly packed, providing strength and durability. The dermis contains the necessary components for tanning and processing into leather. Epidermis (A) is the outermost layer of the skin and does not contain the required collagen fibers. Adipose tissues (C) are responsible for fat storage and do not contribute to leather production. Collagen fibers (D) are present in the dermis, but the process of converting them into leather involves the entire dermal layer, not just the fibers alone.

Correct Answer: C

Rationale: The correct answer is C: Less sweat in cold weather. During cold weather, the body's sweat glands produce less sweat as a way to conserve heat. This decrease in sweat production leads to less moisture on the skin, causing it to become dry. Vasodilation (choice A) is the widening of blood vessels, which can actually lead to increased moisture on the skin. Vasoconstriction (choice B) is the narrowing of blood vessels, which can affect blood flow but not directly contribute to dry skin. Choice D is incorrect as less sweat production in cold weather is the primary reason for dry skin.

Correct Answer: C

Rationale: The correct answer is C: Nerves. Nails do not contain nerves, which are responsible for transmitting pain signals to the brain. Without nerves, the sensation of pain cannot be felt when cutting the nails. Blood vessels (choice A) and bones (choice B) are not directly related to the sensation of pain in this scenario. Choice D is incorrect as nails do not contain any of these structures that would transmit pain. In summary, the absence of nerves in nails is the reason why we do not feel pain when cutting them.

Correct Answer: A

Rationale: The correct answer is A: Dermis. Corium is another name for the dermis, the layer of skin beneath the epidermis. The dermis contains blood vessels, nerves, hair follicles, and sweat glands. The epidermis is the outermost layer of skin and is primarily composed of dead skin cells. Choice B (Epidermis) is incorrect because corium does not refer to the epidermis. Choice C (Both (1) and (2)) is incorrect because corium specifically refers to the dermis only. Choice D (None) is incorrect as corium is indeed another term for the dermis.

Correct Answer: A

Rationale: The correct answer is A: Oily. Sebaceous glands secrete an oily substance called sebum, which helps lubricate and waterproof the skin and hair. Sebum is composed of lipids and fatty acids, giving it an oily consistency. Choice B (Watery) is incorrect as sebaceous glands do not secrete a watery substance. Choice C (Creamy) is incorrect as sebum is not creamy in texture. Choice D (Mucoid) is incorrect as sebaceous glands do not secrete a mucoid substance. The oily nature of sebum is essential for maintaining skin health and function.