Leather for shoes is obtained from dermis because-

Correct Answer: C

Rationale: The correct answer is C because the dermis is the layer of skin that provides strength, flexibility, and elasticity, making it suitable for shoe leather. Choice A is incorrect because the presence of cells alone doesn't determine leather quality. Choice B is incorrect as hardness is not a desirable quality for shoe leather. Choice D is incorrect as ecdysis refers to the shedding of skin by animals, not the process of obtaining leather.

Correct Answer: B

Rationale: The correct answer is B: Meissner's corpuscles. Meissner's corpuscles are responsible for detecting light touch and low-frequency vibration. They are located in the upper dermis and have rapidly adapting receptors, making them sensitive to changes in stimuli. Pacinian corpuscles (A) detect deep pressure and high-frequency vibration, Krause's bulbs (C) detect cold temperatures, and Corpuscles of Ruffini (D) detect skin stretching and continuous pressure. Meissner's corpuscles specifically match the description of touch receptors in mammalian skin, making it the correct choice.

Correct Answer: D

Rationale: The correct answer is D: Almost hairless skin. Elephants living in hot climates need to regulate their body temperature efficiently. Having almost hairless skin helps them dissipate heat effectively through their skin. This adaptation is crucial for elephants to thrive in hot environments. A: Its huge size is not a direct indicator of its ability to survive in a hot climate. B: Small eye size is not necessarily related to their adaptation to hot climates. C: Fleshy feet do not specifically indicate their preference for hot climates.

Correct Answer: C

Rationale: The correct answer is C: Skin. The skin is known as the 'Jack of all trades' because it performs multiple functions such as protection, regulation of body temperature, sensation, and synthesis of Vitamin D. It acts as a barrier against pathogens and harmful substances, regulates body temperature through sweat production, contains sensory receptors for touch, pressure, and pain, and plays a role in the synthesis of Vitamin D when exposed to sunlight. Rationale for other choices: A: Kidney - While the kidney plays a crucial role in filtering waste and maintaining electrolyte balance, it doesn't perform as wide a range of functions as the skin. B: Brain - The brain is the control center of the body, responsible for processing information, coordinating movements, and regulating bodily functions. However, it doesn't have the same versatility in functions as the skin. D: All of the above - This choice is incorrect because not all organs mentioned (kidney, brain) are known as the 'Jack of all

Correct Answer: C

Rationale: The correct order for the stages in skin regeneration following an injury is: 1) Blood clot/scab formation, 2) Epidermis covers granulation tissue, 3) Epidermis covers scar tissue, and 4) Calcium injection. Rationale: 1) Blood clot/scab formation occurs first to stop bleeding and prevent infection. 2) Epidermis covering granulation tissue signifies the growth of new tissue. 3) Epidermis covering scar tissue indicates the completion of tissue repair. 4) Calcium injection is not a typical stage in skin regeneration; it does not play a direct role in the natural healing process. Summary: Choice A is incorrect as it starts with covering scar tissue, which is a later stage. Choice B is incorrect as it introduces calcium injection, which is not a standard stage. Choice D is incorrect as it places calcium injection before blood clot formation, which is inaccurate.