Integument is usually called by the proverb 'Jack of all trades' because it-

Correct Answer: D

Rationale: The correct answer is D because the integument, which includes the skin, hair, and nails, performs various functions such as protection, temperature regulation, sensation, and vitamin D production. It acts as a barrier against pathogens and UV radiation, regulates body temperature through sweat production, and contains sensory receptors for touch, pressure, and temperature. Choices A, B, and C are incorrect because while the integument does give shape to the body, protect the body, and contain growth inhibitors to some extent, these functions alone do not fully encompass the wide range of roles performed by the integument.

Correct Answer: A

Rationale: The correct answer is A: Stratum spinosum. The prickle-cell layer is another name for the stratum spinosum. This layer is located between the stratum basale and stratum granulosum in the epidermis. It consists of cells that appear spiny under a microscope due to desmosomes between them. These desmosomes give the cells a prickle-like appearance. The stratum corneum (B) is the outermost layer of the epidermis, composed of dead keratinocytes. The stratum germinativum (C) is another name for the stratum basale, the deepest layer of the epidermis where cell division occurs. Choice D is incorrect as the prickle-cell layer does have a specific name, which is the stratum spinosum.

Correct Answer: A

Rationale: The correct answer is A because sebaceous glands secrete sebum, an oily substance that lubricates the hair and skin, making them waterproof. Sebum also helps protect the skin from drying out and maintains its elasticity. Choice B is incorrect because sebum doesn't make the hair waterproof on its own. Choice C is incorrect because sebum also affects the skin, not just the hair. Choice D is incorrect as sebum plays a crucial role in skin and hair health.

Correct Answer: A

Rationale: The correct answer is A: Rhinoceros. Rhinoceros is the only animal among the options that has sweat glands only on its pinnae (ears). The other choices, Deer, Hippopotamus, and Rabbit, have sweat glands distributed throughout their bodies or in different areas, not just on the pinnae. This unique anatomical feature of the Rhinoceros helps it regulate body temperature by cooling the blood vessels around the ears. Therefore, Rhinoceros is the correct answer based on the specific location of its sweat glands.

Correct Answer: D

Rationale: The correct answer is D: Stratum corneum. This layer of skin is water-proof due to the presence of keratin, a protein that forms a protective barrier against water loss and external substances. The other choices, A, B, and C, do not have the same water-proofing properties. Stratum germinativum is the innermost layer responsible for cell division, stratum granulosum is involved in keratin production, and stratum lucidum is a thin, translucent layer found only in thick skin areas. Therefore, only the stratum corneum contains the necessary structures to make it water-proof, making it the correct choice.